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arangodb/VocBase/synchroniser.c

416 lines
12 KiB
C

////////////////////////////////////////////////////////////////////////////////
/// @brief synchroniser
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2010-2011 triagens GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
/// http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is triAGENS GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
/// @author Copyright 2011, triagens GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////
#include "synchroniser.h"
#include <BasicsC/logging.h>
#include <VocBase/simple-collection.h>
// -----------------------------------------------------------------------------
// --SECTION-- private constants
// -----------------------------------------------------------------------------
////////////////////////////////////////////////////////////////////////////////
/// @addtogroup VocBase
/// @{
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
/// @brief synchroniser interval in microseconds
////////////////////////////////////////////////////////////////////////////////
static int const SYNCHRONISER_INTERVAL = 1 * 1000 * 1000;
////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////
// -----------------------------------------------------------------------------
// --SECTION-- private functions
// -----------------------------------------------------------------------------
////////////////////////////////////////////////////////////////////////////////
/// @addtogroup VocBase
/// @{
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
/// @brief checks if a file needs to be synced
////////////////////////////////////////////////////////////////////////////////
static bool CheckSyncSimCollection (TRI_sim_collection_t* sim) {
TRI_collection_t* base;
TRI_datafile_t* journal;
TRI_voc_size_t nWritten;
bool ok;
bool worked;
char const* synced;
char* written;
double ti;
size_t i;
size_t n;
worked = false;
base = &sim->base.base;
// .............................................................................
// the only thread MODIFYING the _journals variable is this thread,
// therefore no locking is required to access the _journals
// .............................................................................
n = base->_journals._length;
for (i = 0; i < n; ++i) {
journal = base->_journals._buffer[i];
TRI_LOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
synced = journal->_synced;
written = journal->_written;
nWritten = journal->_nWritten;
TRI_UNLOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
if (synced < written) {
worked = true;
ok = TRI_msync(journal->_fd, synced, written);
ti = TRI_microtime();
TRI_LOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
if (ok) {
journal->_synced = written;
journal->_nSynced = nWritten;
journal->_lastSynced = ti;
}
else {
journal->_state = TRI_DF_STATE_WRITE_ERROR;
}
TRI_BROADCAST_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
TRI_UNLOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
if (ok) {
LOG_TRACE("msync succeeded %p, size %lu", synced, (unsigned long)(written - synced));
}
else {
LOG_ERROR("msync failed with: %s", TRI_last_error());
}
}
}
return worked;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief checks the journal of a document collection
////////////////////////////////////////////////////////////////////////////////
static bool CheckJournalSimCollection (TRI_sim_collection_t* sim) {
TRI_collection_t* base;
TRI_datafile_t* journal;
bool worked;
size_t i;
size_t n;
worked = false;
base = &sim->base.base;
// .............................................................................
// the only thread MODIFYING the _journals variable is this thread,
// therefore no locking is required to access the _journals
// .............................................................................
n = base->_journals._length;
for (i = 0; i < n;) {
journal = base->_journals._buffer[i];
if (journal->_full) {
worked = true;
LOG_DEBUG("closing full journal '%s'", journal->_filename);
TRI_LOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
TRI_CloseJournalDocCollection(&sim->base, i);
TRI_UNLOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
n = base->_journals._length;
i = 0;
}
else {
++i;
}
}
if (base->_journals._length == 0) {
worked = true;
TRI_LOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
journal = TRI_CreateJournalDocCollection(&sim->base);
if (journal != NULL) {
LOG_DEBUG("created new journal '%s'", journal->_filename);
}
TRI_BROADCAST_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
TRI_UNLOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
}
return worked;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief checks if a compactor file needs to be synced
////////////////////////////////////////////////////////////////////////////////
static bool CheckSyncCompactorSimCollection (TRI_sim_collection_t* sim) {
TRI_collection_t* base;
TRI_datafile_t* journal;
bool ok;
bool worked;
char const* synced;
char* written;
double ti;
size_t i;
size_t n;
worked = false;
base = &sim->base.base;
// .............................................................................
// the only thread MODIFYING the _compactors variable is this thread,
// therefore no locking is required to access the _compactors
// .............................................................................
n = base->_compactors._length;
for (i = 0; i < n; ++i) {
journal = base->_compactors._buffer[i];
TRI_LOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
synced = journal->_synced;
written = journal->_written;
TRI_UNLOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
if (synced < written) {
worked = true;
ok = TRI_msync(journal->_fd, synced, written);
ti = TRI_microtime();
TRI_LOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
if (ok) {
journal->_synced = written;
journal->_lastSynced = ti;
}
else {
journal->_state = TRI_DF_STATE_WRITE_ERROR;
}
TRI_BROADCAST_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
TRI_UNLOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
if (ok) {
LOG_TRACE("msync succeeded %p, size %lu", synced, (unsigned long)(written - synced));
}
else {
LOG_ERROR("msync failed with: %s", TRI_last_error());
}
}
}
return worked;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief checks the compactor of a document collection
////////////////////////////////////////////////////////////////////////////////
static bool CheckCompactorSimCollection (TRI_sim_collection_t* sim) {
TRI_collection_t* base;
TRI_datafile_t* compactor;
bool worked;
size_t i;
size_t n;
worked = false;
base = &sim->base.base;
// .............................................................................
// the only thread MODIFYING the _compactor variable is this thread,
// therefore no locking is required to access the _compactors
// .............................................................................
n = base->_compactors._length;
for (i = 0; i < n;) {
compactor = base->_compactors._buffer[i];
if (compactor->_full) {
worked = true;
LOG_DEBUG("closing full compactor '%s'", compactor->_filename);
TRI_LOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
TRI_CloseCompactorDocCollection(&sim->base, i);
TRI_UNLOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
n = base->_compactors._length;
i = 0;
}
else {
++i;
}
}
if (base->_compactors._length == 0) {
worked = true;
TRI_LOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
compactor = TRI_CreateCompactorDocCollection(&sim->base);
if (compactor != NULL) {
LOG_DEBUG("created new compactor '%s'", compactor->_filename);
}
TRI_BROADCAST_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
TRI_UNLOCK_JOURNAL_ENTRIES_SIM_COLLECTION(sim);
}
return worked;
}
////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////
// -----------------------------------------------------------------------------
// --SECTION-- public functions
// -----------------------------------------------------------------------------
////////////////////////////////////////////////////////////////////////////////
/// @addtogroup VocBase
/// @{
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
/// @brief synchroniser event loop
////////////////////////////////////////////////////////////////////////////////
void TRI_SynchroniserVocBase (void* data) {
TRI_col_type_e type;
TRI_vocbase_t* vocbase = data;
TRI_vector_pointer_t collections;
assert(vocbase->_active);
TRI_InitVectorPointer(&collections);
while (true) {
size_t n;
size_t i;
bool worked;
// keep initial _active value as vocbase->_active might change during compaction loop
int active = vocbase->_active;
worked = false;
// copy all collections
TRI_READ_LOCK_COLLECTIONS_VOCBASE(vocbase);
TRI_CopyDataVectorPointer(&collections, &vocbase->_collections);
TRI_READ_UNLOCK_COLLECTIONS_VOCBASE(vocbase);
n = collections._length;
for (i = 0; i < n; ++i) {
TRI_vocbase_col_t* collection;
TRI_doc_collection_t* doc;
bool result;
collection = collections._buffer[i];
TRI_READ_LOCK_STATUS_VOCBASE_COL(collection);
if (collection->_status != TRI_VOC_COL_STATUS_LOADED) {
TRI_READ_UNLOCK_STATUS_VOCBASE_COL(collection);
continue;
}
doc = collection->_collection;
// for simple document collection, first sync and then seal
type = doc->base._type;
if (type == TRI_COL_TYPE_SIMPLE_DOCUMENT) {
result = CheckSyncSimCollection((TRI_sim_collection_t*) doc);
worked |= result;
result = CheckJournalSimCollection((TRI_sim_collection_t*) doc);
worked |= result;
result = CheckSyncCompactorSimCollection((TRI_sim_collection_t*) doc);
worked |= result;
result = CheckCompactorSimCollection((TRI_sim_collection_t*) doc);
worked |= result;
}
TRI_READ_UNLOCK_STATUS_VOCBASE_COL(collection);
}
if (! worked && vocbase->_active == 1) {
// only sleep while server is still running
usleep(SYNCHRONISER_INTERVAL);
}
if (active == 2) {
// server shutdown
break;
}
}
TRI_DestroyVectorPointer(&collections);
}
////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////
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