mirror of https://gitee.com/bigwinds/arangodb
1023 lines
31 KiB
C++
1023 lines
31 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief replication continuous data synchroniser
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2014 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
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/// @author Copyright 2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "ContinuousSyncer.h"
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#include "Basics/json.h"
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#include "Basics/JsonHelper.h"
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#include "Basics/StringBuffer.h"
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#include "Rest/HttpRequest.h"
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#include "Rest/SslInterface.h"
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#include "SimpleHttpClient/GeneralClientConnection.h"
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#include "SimpleHttpClient/SimpleHttpClient.h"
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#include "SimpleHttpClient/SimpleHttpResult.h"
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#include "Utils/CollectionGuard.h"
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#include "Utils/Exception.h"
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#include "Utils/transactions.h"
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#include "VocBase/document-collection.h"
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#include "VocBase/transaction.h"
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#include "VocBase/vocbase.h"
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#include "VocBase/voc-types.h"
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using namespace std;
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using namespace triagens::basics;
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using namespace triagens::rest;
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using namespace triagens::arango;
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using namespace triagens::httpclient;
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// -----------------------------------------------------------------------------
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// --SECTION-- private functions
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// -----------------------------------------------------------------------------
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static inline void LocalGetline (char const*& p,
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string& line,
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char delim) {
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char const* q = p;
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while (*p != 0 && *p != delim) {
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p++;
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}
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line.assign(q, p - q);
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if (*p == delim) {
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p++;
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}
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- private defines
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief write-lock the status
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////////////////////////////////////////////////////////////////////////////////
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#define WRITE_LOCK_STATUS(applier) \
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while (! TRI_TryWriteLockReadWriteLock(&(applier->_statusLock))) { \
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usleep(1000); \
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief write-unlock the status
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////////////////////////////////////////////////////////////////////////////////
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#define WRITE_UNLOCK_STATUS(applier) \
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TRI_WriteUnlockReadWriteLock(&(applier->_statusLock))
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constructor
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////////////////////////////////////////////////////////////////////////////////
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ContinuousSyncer::ContinuousSyncer (TRI_server_t* server,
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TRI_vocbase_t* vocbase,
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TRI_replication_applier_configuration_t const* configuration,
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TRI_voc_tick_t initialTick,
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bool useTick)
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: Syncer(vocbase, configuration),
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_server(server),
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_applier(vocbase->_replicationApplier),
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_chunkSize(),
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_initialTick(initialTick),
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_useTick(useTick) {
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uint64_t c = configuration->_chunkSize;
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if (c == 0) {
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c = (uint64_t) 256 * 1024; // 256 kb
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}
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TRI_ASSERT(c > 0);
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_chunkSize = StringUtils::itoa(c);
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// get number of running remote transactions so we can forge the transaction
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// statistics
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int const n = static_cast<int>(_applier->_runningRemoteTransactions.size());
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triagens::arango::TransactionBase::setNumbers(n, n);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destructor
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////////////////////////////////////////////////////////////////////////////////
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ContinuousSyncer::~ContinuousSyncer () {
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief run method, performs continuous synchronisation
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////////////////////////////////////////////////////////////////////////////////
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int ContinuousSyncer::run () {
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if (_client == nullptr ||
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_connection == nullptr ||
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_endpoint == nullptr) {
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return TRI_ERROR_INTERNAL;
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}
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string errorMsg;
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int res = TRI_ERROR_NO_ERROR;
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uint64_t connectRetries = 0;
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// reset failed connects
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WRITE_LOCK_STATUS(_applier);
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_applier->_state._failedConnects = 0;
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WRITE_UNLOCK_STATUS(_applier);
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while (_vocbase->_state < 2) {
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setProgress("fetching master state information");
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res = getMasterState(errorMsg);
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if (res == TRI_ERROR_REPLICATION_NO_RESPONSE ||
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res == TRI_ERROR_REPLICATION_MASTER_ERROR) {
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// master error. try again after a sleep period
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connectRetries++;
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WRITE_LOCK_STATUS(_applier);
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_applier->_state._failedConnects = connectRetries;
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_applier->_state._totalRequests++;
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_applier->_state._totalFailedConnects++;
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WRITE_UNLOCK_STATUS(_applier);
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if (connectRetries <= _configuration._maxConnectRetries) {
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// check if we are aborted externally
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if (TRI_WaitReplicationApplier(_applier, 10 * 1000 * 1000)) {
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continue;
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}
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// somebody stopped the applier
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res = TRI_ERROR_REPLICATION_APPLIER_STOPPED;
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}
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}
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// we either got a connection or an error
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break;
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}
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if (res == TRI_ERROR_NO_ERROR) {
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WRITE_LOCK_STATUS(_applier);
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res = getLocalState(errorMsg);
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_applier->_state._failedConnects = 0;
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_applier->_state._totalRequests++;
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WRITE_UNLOCK_STATUS(_applier);
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}
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if (res != TRI_ERROR_NO_ERROR) {
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// stop ourselves
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TRI_StopReplicationApplier(_applier, false);
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return TRI_SetErrorReplicationApplier(_applier, res, errorMsg.c_str());
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}
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if (res == TRI_ERROR_NO_ERROR) {
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res = runContinuousSync(errorMsg);
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}
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if (res != TRI_ERROR_NO_ERROR) {
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TRI_SetErrorReplicationApplier(_applier, res, errorMsg.c_str());
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// stop ourselves
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TRI_StopReplicationApplier(_applier, false);
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return res;
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}
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return TRI_ERROR_NO_ERROR;
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- private methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief set the applier progress
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////////////////////////////////////////////////////////////////////////////////
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void ContinuousSyncer::setProgress (char const* msg) {
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TRI_SetProgressReplicationApplier(_applier, msg, true);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief save the current applier state
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////////////////////////////////////////////////////////////////////////////////
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int ContinuousSyncer::saveApplierState () {
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LOG_TRACE("saving replication applier state. last applied continuous tick: %llu",
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(unsigned long long) _applier->_state._lastAppliedContinuousTick);
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int res = TRI_SaveStateReplicationApplier(_vocbase, &_applier->_state, false);
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if (res != TRI_ERROR_NO_ERROR) {
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LOG_WARNING("unable to save replication applier state: %s",
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TRI_errno_string(res));
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}
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return res;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get local replication apply state
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////////////////////////////////////////////////////////////////////////////////
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int ContinuousSyncer::getLocalState (string& errorMsg) {
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int res;
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uint64_t oldTotalRequests = _applier->_state._totalRequests;
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uint64_t oldTotalFailedConnects = _applier->_state._totalFailedConnects;
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res = TRI_LoadStateReplicationApplier(_vocbase, &_applier->_state);
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_applier->_state._active = true;
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_applier->_state._totalRequests = oldTotalRequests;
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_applier->_state._totalFailedConnects = oldTotalFailedConnects;
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if (res == TRI_ERROR_FILE_NOT_FOUND) {
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// no state file found, so this is the initialisation
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_applier->_state._serverId = _masterInfo._serverId;
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res = TRI_SaveStateReplicationApplier(_vocbase, &_applier->_state, true);
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if (res != TRI_ERROR_NO_ERROR) {
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errorMsg = "could not save replication state information";
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}
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}
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else if (res == TRI_ERROR_NO_ERROR) {
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if (_masterInfo._serverId != _applier->_state._serverId &&
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_applier->_state._serverId != 0) {
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res = TRI_ERROR_REPLICATION_MASTER_CHANGE;
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errorMsg = "encountered wrong master id in replication state file. "
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"found: " + StringUtils::itoa(_masterInfo._serverId) + ", "
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"expected: " + StringUtils::itoa(_applier->_state._serverId);
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}
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}
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else {
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// some error occurred
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TRI_ASSERT(res != TRI_ERROR_NO_ERROR);
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errorMsg = TRI_errno_string(res);
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}
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return res;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief inserts a document, based on the JSON provided
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////////////////////////////////////////////////////////////////////////////////
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int ContinuousSyncer::processDocument (TRI_replication_operation_e type,
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TRI_json_t const* json,
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string& errorMsg) {
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// extract "cid"
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TRI_voc_cid_t cid = getCid(json);
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if (cid == 0) {
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return TRI_ERROR_ARANGO_COLLECTION_NOT_FOUND;
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}
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// extract "key"
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TRI_json_t const* keyJson = JsonHelper::getArrayElement(json, "key");
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if (! JsonHelper::isString(keyJson)) {
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return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
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}
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// extract "rev"
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TRI_voc_rid_t rid;
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string const ridString = JsonHelper::getStringValue(json, "rev", "");
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if (ridString.empty()) {
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rid = 0;
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}
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else {
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rid = StringUtils::uint64(ridString.c_str(), ridString.size());
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}
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// extract "data"
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TRI_json_t const* doc = JsonHelper::getArrayElement(json, "data");
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// extract "tid"
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string const id = JsonHelper::getStringValue(json, "tid", "");
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TRI_voc_tid_t tid;
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if (id.empty()) {
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// standalone operation
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tid = 0;
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}
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else {
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// operation is part of a transaction
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tid = static_cast<TRI_voc_tid_t>(StringUtils::uint64(id.c_str(), id.size()));
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}
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if (tid > 0) {
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auto it = _applier->_runningRemoteTransactions.find(tid);
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if (it == _applier->_runningRemoteTransactions.end()) {
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return TRI_ERROR_REPLICATION_UNEXPECTED_TRANSACTION;
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}
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auto trx = (*it).second;
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TRI_ASSERT(trx != nullptr);
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TRI_transaction_collection_t* trxCollection = trx->trxCollection(cid);
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if (trxCollection == nullptr) {
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return TRI_ERROR_ARANGO_COLLECTION_NOT_FOUND;
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}
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int res = applyCollectionDumpMarker(trxCollection,
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type,
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(const TRI_voc_key_t) keyJson->_value._string.data,
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rid,
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doc,
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errorMsg);
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return res;
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}
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else {
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// standalone operation
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// update the apply tick for all standalone operations
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SingleCollectionWriteTransaction<RestTransactionContext, 1> trx(_vocbase, cid);
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int res = trx.begin();
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if (res != TRI_ERROR_NO_ERROR) {
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errorMsg = "unable to create replication transaction: " + string(TRI_errno_string(res));
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return res;
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}
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TRI_transaction_collection_t* trxCollection = trx.trxCollection();
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if (trxCollection == nullptr) {
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return TRI_ERROR_ARANGO_COLLECTION_NOT_FOUND;
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}
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res = applyCollectionDumpMarker(trxCollection,
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type,
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(const TRI_voc_key_t) keyJson->_value._string.data,
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rid,
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doc,
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errorMsg);
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res = trx.finish(res);
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return res;
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief starts a transaction, based on the JSON provided
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////////////////////////////////////////////////////////////////////////////////
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int ContinuousSyncer::startTransaction (TRI_json_t const* json) {
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// {"type":2200,"tid":"230920705812199","collections":[{"cid":"230920700700391","operations":10}]}
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string const id = JsonHelper::getStringValue(json, "tid", "");
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if (id.empty()) {
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return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
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}
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// transaction id
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// note: this is the remote trasnaction id!
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TRI_voc_tid_t tid = static_cast<TRI_voc_tid_t>(StringUtils::uint64(id.c_str(), id.size()));
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auto it = _applier->_runningRemoteTransactions.find(tid);
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if (it != _applier->_runningRemoteTransactions.end()) {
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_applier->_runningRemoteTransactions.erase(tid);
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auto trx = (*it).second;
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// abort ongoing trx
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delete trx;
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}
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TRI_ASSERT(tid > 0);
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LOG_TRACE("starting replication transaction %llu", (unsigned long long) tid);
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auto trx = new ReplicationTransaction(_server, _vocbase, tid);
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if (trx == nullptr) {
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return TRI_ERROR_OUT_OF_MEMORY;
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}
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int res = trx->begin();
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if (res != TRI_ERROR_NO_ERROR) {
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delete trx;
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return res;
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}
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_applier->_runningRemoteTransactions.insert(it, std::make_pair(tid, trx));
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return TRI_ERROR_NO_ERROR;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief aborts a transaction, based on the JSON provided
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////////////////////////////////////////////////////////////////////////////////
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int ContinuousSyncer::abortTransaction (TRI_json_t const* json) {
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// {"type":2201,"tid":"230920705812199","collections":[{"cid":"230920700700391","operations":10}]}
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string const id = JsonHelper::getStringValue(json, "tid", "");
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if (id.empty()) {
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return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
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}
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// transaction id
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// note: this is the remote trasnaction id!
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TRI_voc_tid_t const tid = static_cast<TRI_voc_tid_t>(StringUtils::uint64(id.c_str(), id.size()));
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auto it = _applier->_runningRemoteTransactions.find(tid);
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if (it == _applier->_runningRemoteTransactions.end()) {
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// invalid state, no transaction was started.
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return TRI_ERROR_REPLICATION_UNEXPECTED_TRANSACTION;
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}
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TRI_ASSERT(tid > 0);
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LOG_TRACE("abort replication transaction %llu", (unsigned long long) tid);
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_applier->_runningRemoteTransactions.erase(tid);
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auto trx = (*it).second;
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int res = trx->abort();
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delete trx;
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return res;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief commits a transaction, based on the JSON provided
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////////////////////////////////////////////////////////////////////////////////
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int ContinuousSyncer::commitTransaction (TRI_json_t const* json) {
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// {"type":2201,"tid":"230920705812199","collections":[{"cid":"230920700700391","operations":10}]}
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string const id = JsonHelper::getStringValue(json, "tid", "");
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if (id.empty()) {
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return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
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}
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// transaction id
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// note: this is the remote trasnaction id!
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TRI_voc_tid_t const tid = static_cast<TRI_voc_tid_t>(StringUtils::uint64(id.c_str(), id.size()));
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auto it = _applier->_runningRemoteTransactions.find(tid);
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if (it == _applier->_runningRemoteTransactions.end()) {
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// invalid state, no transaction was started.
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return TRI_ERROR_REPLICATION_UNEXPECTED_TRANSACTION;
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}
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TRI_ASSERT(tid > 0);
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LOG_TRACE("committing replication transaction %llu", (unsigned long long) tid);
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_applier->_runningRemoteTransactions.erase(tid);
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auto trx = (*it).second;
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int res = trx->commit();
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delete trx;
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return res;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief renames a collection, based on the JSON provided
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////////////////////////////////////////////////////////////////////////////////
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int ContinuousSyncer::renameCollection (TRI_json_t const* json) {
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TRI_json_t const* collectionJson = TRI_LookupArrayJson(json, "collection");
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string const name = JsonHelper::getStringValue(collectionJson, "name", "");
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if (name.empty()) {
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return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
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}
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TRI_voc_cid_t cid = getCid(json);
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TRI_vocbase_col_t* col = TRI_LookupCollectionByIdVocBase(_vocbase, cid);
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if (col == nullptr) {
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return TRI_ERROR_ARANGO_COLLECTION_NOT_FOUND;
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}
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return TRI_RenameCollectionVocBase(_vocbase,
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col,
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name.c_str(),
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true,
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true);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief changes the properties of a collection, based on the JSON provided
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////////////////////////////////////////////////////////////////////////////////
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int ContinuousSyncer::changeCollection (TRI_json_t const* json) {
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TRI_json_t const* collectionJson = TRI_LookupArrayJson(json, "collection");
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bool waitForSync = JsonHelper::getBooleanValue(collectionJson, "waitForSync", false);
|
|
bool doCompact = JsonHelper::getBooleanValue(collectionJson, "doCompact", true);
|
|
int maximalSize = JsonHelper::getNumericValue<int>(collectionJson, "maximalSize", TRI_JOURNAL_DEFAULT_MAXIMAL_SIZE);
|
|
|
|
TRI_voc_cid_t cid = getCid(json);
|
|
TRI_vocbase_col_t* col = TRI_LookupCollectionByIdVocBase(_vocbase, cid);
|
|
|
|
if (col == nullptr) {
|
|
return TRI_ERROR_ARANGO_COLLECTION_NOT_FOUND;
|
|
}
|
|
|
|
try {
|
|
triagens::arango::CollectionGuard guard(_vocbase, cid);
|
|
|
|
TRI_col_info_t parameters;
|
|
|
|
// only need to set these three properties as the others cannot be updated on the fly
|
|
parameters._doCompact = doCompact;
|
|
parameters._maximalSize = maximalSize;
|
|
parameters._waitForSync = waitForSync;
|
|
|
|
bool doSync = _vocbase->_settings.forceSyncProperties;
|
|
return TRI_UpdateCollectionInfo(_vocbase, guard.collection()->_collection, ¶meters, doSync);
|
|
}
|
|
catch (triagens::arango::Exception const& ex) {
|
|
return ex.code();
|
|
}
|
|
catch (...) {
|
|
return TRI_ERROR_INTERNAL;
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief apply a single marker from the continuous log
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
int ContinuousSyncer::applyLogMarker (TRI_json_t const* json,
|
|
bool& updateTick,
|
|
string& errorMsg) {
|
|
|
|
static const string invalidMsg = "received invalid JSON data";
|
|
|
|
updateTick = true;
|
|
|
|
// check data
|
|
if (! JsonHelper::isArray(json)) {
|
|
errorMsg = invalidMsg;
|
|
|
|
return TRI_ERROR_REPLICATION_INVALID_RESPONSE;
|
|
}
|
|
|
|
// fetch marker "type"
|
|
int typeValue = JsonHelper::getNumericValue<int>(json, "type", 0);
|
|
|
|
// fetch "tick"
|
|
string const tick = JsonHelper::getStringValue(json, "tick", "");
|
|
|
|
if (! tick.empty()) {
|
|
TRI_voc_tick_t newTick = static_cast<TRI_voc_tick_t>(StringUtils::uint64(tick.c_str(), tick.size()));
|
|
|
|
WRITE_LOCK_STATUS(_applier);
|
|
if (newTick > _applier->_state._lastProcessedContinuousTick) {
|
|
_applier->_state._lastProcessedContinuousTick = newTick;
|
|
}
|
|
else {
|
|
LOG_WARNING("replication marker tick value %llu is lower than last processed tick value %llu",
|
|
(unsigned long long) newTick,
|
|
(unsigned long long) _applier->_state._lastProcessedContinuousTick);
|
|
}
|
|
WRITE_UNLOCK_STATUS(_applier);
|
|
}
|
|
|
|
// handle marker type
|
|
TRI_replication_operation_e type = (TRI_replication_operation_e) typeValue;
|
|
|
|
if (type == REPLICATION_MARKER_DOCUMENT ||
|
|
type == REPLICATION_MARKER_EDGE ||
|
|
type == REPLICATION_MARKER_REMOVE) {
|
|
return processDocument(type, json, errorMsg);
|
|
}
|
|
|
|
else if (type == REPLICATION_TRANSACTION_START) {
|
|
return startTransaction(json);
|
|
}
|
|
|
|
else if (type == REPLICATION_TRANSACTION_ABORT) {
|
|
return abortTransaction(json);
|
|
}
|
|
|
|
else if (type == REPLICATION_TRANSACTION_COMMIT) {
|
|
return commitTransaction(json);
|
|
}
|
|
|
|
else if (type == REPLICATION_COLLECTION_CREATE) {
|
|
TRI_json_t const* collectionJson = TRI_LookupArrayJson(json, "collection");
|
|
|
|
return createCollection(collectionJson, nullptr);
|
|
}
|
|
|
|
else if (type == REPLICATION_COLLECTION_DROP) {
|
|
return dropCollection(json, false);
|
|
}
|
|
|
|
else if (type == REPLICATION_COLLECTION_RENAME) {
|
|
return renameCollection(json);
|
|
}
|
|
|
|
else if (type == REPLICATION_COLLECTION_CHANGE) {
|
|
return changeCollection(json);
|
|
}
|
|
|
|
else if (type == REPLICATION_INDEX_CREATE) {
|
|
return createIndex(json);
|
|
}
|
|
|
|
else if (type == REPLICATION_INDEX_DROP) {
|
|
return dropIndex(json);
|
|
}
|
|
|
|
else {
|
|
errorMsg = "unexpected marker type " + StringUtils::itoa(type);
|
|
updateTick = true;
|
|
|
|
return TRI_ERROR_REPLICATION_UNEXPECTED_MARKER;
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief apply the data from the continuous log
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
int ContinuousSyncer::applyLog (SimpleHttpResult* response,
|
|
string& errorMsg,
|
|
uint64_t& processedMarkers,
|
|
uint64_t& ignoreCount) {
|
|
|
|
StringBuffer& data = response->getBody();
|
|
|
|
char const* p = data.c_str();
|
|
|
|
while (true) {
|
|
string line;
|
|
|
|
LocalGetline(p, line, '\n');
|
|
|
|
if (line.size() < 2) {
|
|
// we are done
|
|
return TRI_ERROR_NO_ERROR;
|
|
}
|
|
|
|
processedMarkers++;
|
|
|
|
TRI_json_t* json = TRI_JsonString(TRI_CORE_MEM_ZONE, line.c_str());
|
|
|
|
bool updateTick;
|
|
int res = applyLogMarker(json, updateTick, errorMsg);
|
|
|
|
if (json != nullptr) {
|
|
TRI_FreeJson(TRI_CORE_MEM_ZONE, json);
|
|
}
|
|
|
|
if (res != TRI_ERROR_NO_ERROR) {
|
|
// apply error
|
|
|
|
if (errorMsg.empty()) {
|
|
// don't overwrite previous error message
|
|
errorMsg = TRI_errno_string(res);
|
|
}
|
|
|
|
if (ignoreCount == 0) {
|
|
if (line.size() > 128) {
|
|
errorMsg += ", offending marker: " + line.substr(0, 128) + "...";
|
|
}
|
|
else {
|
|
errorMsg += ", offending marker: " + line;;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
else {
|
|
ignoreCount--;
|
|
LOG_WARNING("ignoring replication error for database '%s': %s",
|
|
_applier->_databaseName,
|
|
errorMsg.c_str());
|
|
errorMsg = "";
|
|
}
|
|
}
|
|
|
|
if (updateTick) {
|
|
// update tick value
|
|
WRITE_LOCK_STATUS(_applier);
|
|
if (_applier->_state._lastProcessedContinuousTick > _applier->_state._lastAppliedContinuousTick) {
|
|
_applier->_state._lastAppliedContinuousTick = _applier->_state._lastProcessedContinuousTick;
|
|
}
|
|
WRITE_UNLOCK_STATUS(_applier);
|
|
}
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief perform a continuous sync with the master
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
int ContinuousSyncer::runContinuousSync (string& errorMsg) {
|
|
uint64_t connectRetries = 0;
|
|
uint64_t inactiveCycles = 0;
|
|
int res = TRI_ERROR_INTERNAL;
|
|
|
|
// get start tick
|
|
// ---------------------------------------
|
|
TRI_voc_tick_t fromTick = 0;
|
|
|
|
WRITE_LOCK_STATUS(_applier);
|
|
|
|
if (_useTick) {
|
|
// use user-defined tick
|
|
fromTick = _initialTick;
|
|
_applier->_state._lastAppliedContinuousTick = 0;
|
|
_applier->_state._lastProcessedContinuousTick = 0;
|
|
saveApplierState();
|
|
}
|
|
else {
|
|
// if we already transferred some data, we'll use the last applied tick
|
|
if (_applier->_state._lastAppliedContinuousTick > fromTick) {
|
|
fromTick = _applier->_state._lastAppliedContinuousTick;
|
|
}
|
|
}
|
|
|
|
WRITE_UNLOCK_STATUS(_applier);
|
|
|
|
if (fromTick == 0) {
|
|
return TRI_ERROR_REPLICATION_NO_START_TICK;
|
|
}
|
|
|
|
// run in a loop. the loop is terminated when the applier is stopped or an
|
|
// error occurs
|
|
while (1) {
|
|
bool worked;
|
|
bool masterActive = false;
|
|
|
|
// fromTick is passed by reference!
|
|
res = followMasterLog(errorMsg, fromTick, _configuration._ignoreErrors, worked, masterActive);
|
|
|
|
uint64_t sleepTime;
|
|
|
|
if (res == TRI_ERROR_REPLICATION_NO_RESPONSE ||
|
|
res == TRI_ERROR_REPLICATION_MASTER_ERROR) {
|
|
// master error. try again after a sleep period
|
|
sleepTime = 30 * 1000 * 1000;
|
|
connectRetries++;
|
|
|
|
WRITE_LOCK_STATUS(_applier);
|
|
_applier->_state._failedConnects = connectRetries;
|
|
_applier->_state._totalRequests++;
|
|
_applier->_state._totalFailedConnects++;
|
|
WRITE_UNLOCK_STATUS(_applier);
|
|
|
|
if (connectRetries > _configuration._maxConnectRetries) {
|
|
// halt
|
|
return res;
|
|
}
|
|
}
|
|
else {
|
|
connectRetries = 0;
|
|
|
|
WRITE_LOCK_STATUS(_applier);
|
|
_applier->_state._failedConnects = connectRetries;
|
|
_applier->_state._totalRequests++;
|
|
WRITE_UNLOCK_STATUS(_applier);
|
|
|
|
if (res != TRI_ERROR_NO_ERROR) {
|
|
// some other error we will not ignore
|
|
return res;
|
|
}
|
|
else {
|
|
// no error
|
|
if (worked) {
|
|
// we have done something, so we won't sleep (but check for cancellation)
|
|
inactiveCycles = 0;
|
|
sleepTime = 0;
|
|
}
|
|
else {
|
|
if (masterActive) {
|
|
sleepTime = 500 * 1000;
|
|
}
|
|
else {
|
|
sleepTime = 5 * 1000 * 1000;
|
|
}
|
|
|
|
if (_configuration._adaptivePolling) {
|
|
inactiveCycles++;
|
|
if (inactiveCycles > 60) {
|
|
sleepTime *= 5;
|
|
}
|
|
else if (inactiveCycles > 30) {
|
|
sleepTime *= 3;
|
|
}
|
|
if (inactiveCycles > 15) {
|
|
sleepTime *= 2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
LOG_TRACE("master active: %d, worked: %d, sleepTime: %llu",
|
|
(int) masterActive,
|
|
(int) worked,
|
|
(unsigned long long) sleepTime);
|
|
|
|
// this will make the applier thread sleep if there is nothing to do,
|
|
// but will also check for cancellation
|
|
if (! TRI_WaitReplicationApplier(_applier, sleepTime)) {
|
|
return TRI_ERROR_REPLICATION_APPLIER_STOPPED;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief run the continuous synchronisation
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
int ContinuousSyncer::followMasterLog (string& errorMsg,
|
|
TRI_voc_tick_t& fromTick,
|
|
uint64_t& ignoreCount,
|
|
bool& worked,
|
|
bool& masterActive) {
|
|
string const baseUrl = BaseUrl + "/logger-follow?chunkSize=" + _chunkSize;
|
|
|
|
map<string, string> headers;
|
|
worked = false;
|
|
|
|
string const tickString = StringUtils::itoa(fromTick);
|
|
string const url = baseUrl + "&from=" + tickString + "&serverId=" + _localServerIdString;
|
|
|
|
LOG_TRACE("running continuous replication request with tick %llu, url %s",
|
|
(unsigned long long) fromTick,
|
|
url.c_str());
|
|
|
|
// send request
|
|
string const progress = "fetching master log from offset " + tickString;
|
|
setProgress(progress.c_str());
|
|
|
|
SimpleHttpResult* response = _client->request(HttpRequest::HTTP_REQUEST_GET,
|
|
url,
|
|
nullptr,
|
|
0,
|
|
headers);
|
|
|
|
if (response == nullptr || ! response->isComplete()) {
|
|
errorMsg = "got invalid response from master at " + string(_masterInfo._endpoint) +
|
|
": " + _client->getErrorMessage();
|
|
|
|
if (response != nullptr) {
|
|
delete response;
|
|
}
|
|
|
|
return TRI_ERROR_REPLICATION_NO_RESPONSE;
|
|
}
|
|
|
|
if (response->wasHttpError()) {
|
|
errorMsg = "got invalid response from master at " + string(_masterInfo._endpoint) +
|
|
": HTTP " + StringUtils::itoa(response->getHttpReturnCode()) +
|
|
": " + response->getHttpReturnMessage();
|
|
|
|
delete response;
|
|
|
|
return TRI_ERROR_REPLICATION_MASTER_ERROR;
|
|
}
|
|
|
|
int res;
|
|
bool checkMore = false;
|
|
bool active = false;
|
|
TRI_voc_tick_t tick;
|
|
|
|
bool found;
|
|
string header = response->getHeaderField(TRI_REPLICATION_HEADER_CHECKMORE, found);
|
|
|
|
if (found) {
|
|
checkMore = StringUtils::boolean(header);
|
|
res = TRI_ERROR_NO_ERROR;
|
|
|
|
header = response->getHeaderField(TRI_REPLICATION_HEADER_ACTIVE, found);
|
|
if (found) {
|
|
active = StringUtils::boolean(header);
|
|
}
|
|
|
|
header = response->getHeaderField(TRI_REPLICATION_HEADER_LASTINCLUDED, found);
|
|
if (found) {
|
|
tick = StringUtils::uint64(header);
|
|
|
|
if (tick > fromTick) {
|
|
fromTick = tick;
|
|
worked = true;
|
|
}
|
|
else {
|
|
// we got the same tick again, this indicates we're at the end
|
|
checkMore = false;
|
|
}
|
|
|
|
header = response->getHeaderField(TRI_REPLICATION_HEADER_LASTTICK, found);
|
|
if (found) {
|
|
tick = StringUtils::uint64(header);
|
|
|
|
WRITE_LOCK_STATUS(_applier);
|
|
_applier->_state._lastAvailableContinuousTick = tick;
|
|
WRITE_UNLOCK_STATUS(_applier);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (! found) {
|
|
res = TRI_ERROR_REPLICATION_INVALID_RESPONSE;
|
|
errorMsg = "got invalid response from master at " + string(_masterInfo._endpoint) +
|
|
": required header is missing";
|
|
}
|
|
|
|
|
|
if (res == TRI_ERROR_NO_ERROR) {
|
|
WRITE_LOCK_STATUS(_applier);
|
|
TRI_voc_tick_t lastAppliedTick = _applier->_state._lastAppliedContinuousTick;
|
|
WRITE_UNLOCK_STATUS(_applier);
|
|
|
|
uint64_t processedMarkers = 0;
|
|
res = applyLog(response, errorMsg, processedMarkers, ignoreCount);
|
|
|
|
if (processedMarkers > 0) {
|
|
worked = true;
|
|
|
|
WRITE_LOCK_STATUS(_applier);
|
|
_applier->_state._totalEvents += processedMarkers;
|
|
|
|
if (_applier->_state._lastAppliedContinuousTick != lastAppliedTick) {
|
|
saveApplierState();
|
|
}
|
|
WRITE_UNLOCK_STATUS(_applier);
|
|
}
|
|
}
|
|
|
|
delete response;
|
|
|
|
if (res != TRI_ERROR_NO_ERROR) {
|
|
return res;
|
|
}
|
|
|
|
masterActive = active;
|
|
|
|
if (! worked) {
|
|
if (checkMore) {
|
|
worked = true;
|
|
}
|
|
}
|
|
|
|
return TRI_ERROR_NO_ERROR;
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// --SECTION-- END-OF-FILE
|
|
// -----------------------------------------------------------------------------
|
|
|
|
// Local Variables:
|
|
// mode: outline-minor
|
|
// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
|
|
// End:
|