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arangodb/tests/Agency/FailedLeaderTest.cpp

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////////////////////////////////////////////////////////////////////////////////
/// @brief test case for FailedLeader job
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2017 ArangoDB 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 ArangoDB GmbH, Cologne, Germany
///
/// @author Andreas Streichardt
/// @author Copyright 2017, ArangoDB GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////
#include "catch.hpp"
#include "fakeit.hpp"
#include "Agency/FailedLeader.h"
#include "Agency/AgentInterface.h"
#include "Agency/MoveShard.h"
#include "Agency/Node.h"
#include "lib/Basics/StringUtils.h"
#include "lib/Random/RandomGenerator.h"
#include <iostream>
#include <velocypack/Parser.h>
#include <velocypack/Slice.h>
#include <velocypack/velocypack-aliases.h>
using namespace arangodb;
using namespace arangodb::basics;
using namespace arangodb::consensus;
using namespace fakeit;
namespace arangodb {
namespace tests {
namespace failed_leader_test {
const std::string PREFIX = "arango";
const std::string DATABASE = "database";
const std::string COLLECTION = "collection";
const std::string SHARD = "s99";
const std::string SHARD_LEADER = "leader";
const std::string SHARD_FOLLOWER1 = "follower1";
const std::string SHARD_FOLLOWER2 = "follower2";
const std::string FREE_SERVER = "free";
const std::string FREE_SERVER2 = "free2";
const char *agency =
#include "FailedLeaderTest.json"
;
Node createNodeFromBuilder(Builder const& builder) {
Builder opBuilder;
{ VPackObjectBuilder a(&opBuilder);
opBuilder.add("new", builder.slice()); }
Node node("");
node.handle<SET>(opBuilder.slice());
return node;
}
Builder createBuilder(char const* c) {
VPackOptions options;
options.checkAttributeUniqueness = true;
VPackParser parser(&options);
parser.parse(c);
Builder builder;
builder.add(parser.steal()->slice());
return builder;
}
Node createNode(char const* c) {
return createNodeFromBuilder(createBuilder(c));
}
Node createRootNode() {
return createNode(agency);
}
char const* todo = R"=({
"creator":"1", "type":"failedLeader", "database":"database",
"collection":"collection", "shard":"s99", "fromServer":"leader",
"jobId":"1", "timeCreated":"2017-01-01 00:00:00"
})=";
typedef std::function<std::unique_ptr<Builder>(
Slice const&, std::string const&)>TestStructureType;
TEST_CASE("FailedLeader", "[agency][supervision]") {
RandomGenerator::seed(3);
auto baseStructure = createRootNode();
Builder builder;
baseStructure.toBuilder(builder);
write_ret_t fakeWriteResult {true, "", std::vector<bool> {true}, std::vector<index_t> {1}};
auto transBuilder = std::make_shared<Builder>();
{ VPackArrayBuilder a(transBuilder.get());
transBuilder->add(VPackValue((uint64_t)1)); }
trans_ret_t fakeTransResult {true, "", 1, 0, transBuilder};
SECTION("creating a job should create a job in todo") {
Mock<AgentInterface> mockAgent;
std::string jobId = "1";
When(Method(mockAgent, write)).AlwaysDo([&](query_t const& q, bool d) -> write_ret_t {
INFO(q->slice().toJson());
auto expectedJobKey = "/arango/Target/ToDo/" + jobId;
REQUIRE(std::string(q->slice().typeName()) == "array" );
REQUIRE(q->slice().length() == 1);
REQUIRE(std::string(q->slice()[0].typeName()) == "array");
REQUIRE(q->slice()[0].length() == 1); // we always simply override! no preconditions...
REQUIRE(std::string(q->slice()[0][0].typeName()) == "object");
REQUIRE(q->slice()[0][0].length() == 1); // should ONLY do an entry in todo
REQUIRE(std::string(q->slice()[0][0].get(expectedJobKey).typeName()) == "object");
auto job = q->slice()[0][0].get(expectedJobKey);
REQUIRE(std::string(job.get("creator").typeName()) == "string");
REQUIRE(std::string(job.get("type").typeName()) == "string");
CHECK(job.get("type").copyString() == "failedLeader");
REQUIRE(std::string(job.get("database").typeName()) == "string");
CHECK(job.get("database").copyString() == DATABASE);
REQUIRE(std::string(job.get("collection").typeName()) == "string");
CHECK(job.get("collection").copyString() == COLLECTION);
REQUIRE(std::string(job.get("shard").typeName()) == "string");
CHECK(job.get("shard").copyString() == SHARD);
REQUIRE(std::string(job.get("fromServer").typeName()) == "string");
CHECK(job.get("fromServer").copyString() == SHARD_LEADER);
CHECK(std::string(job.get("jobId").typeName()) == "string");
CHECK(std::string(job.get("timeCreated").typeName()) == "string");
return fakeWriteResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
AgentInterface &agent = mockAgent.get();
auto failedLeader = FailedLeader(
baseStructure,
&agent,
jobId,
"unittest",
DATABASE,
COLLECTION,
SHARD,
SHARD_LEADER
);
failedLeader.create();
}
SECTION("if we want to start and the collection went missing from plan (our truth) the job should just finish") {
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder;
if (path == "/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION) {
return builder;
}
builder.reset(new Builder());
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Target/ToDo") {
builder->add("1", createBuilder(todo).slice());
}
} else {
builder->add(s);
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
Node agency = createNodeFromBuilder(*builder);
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).AlwaysDo([&](query_t const& q, bool d) -> write_ret_t {
INFO(q->slice().toJson());
REQUIRE(std::string(q->slice().typeName()) == "array" );
REQUIRE(q->slice().length() == 1);
REQUIRE(std::string(q->slice()[0].typeName()) == "array");
REQUIRE(q->slice()[0].length() == 1); // we always simply override! no preconditions...
REQUIRE(std::string(q->slice()[0][0].typeName()) == "object");
auto writes = q->slice()[0][0];
REQUIRE(std::string(writes.get("/arango/Target/ToDo/1").typeName()) == "object");
REQUIRE(std::string(writes.get("/arango/Target/ToDo/1").get("op").typeName()) == "string");
CHECK(writes.get("/arango/Target/ToDo/1").get("op").copyString() == "delete");
CHECK(std::string(writes.get("/arango/Target/Finished/1").typeName()) == "object");
return fakeWriteResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
AgentInterface &agent = mockAgent.get();
auto failedLeader = FailedLeader(
agency("arango"),
&agent,
JOB_STATUS::TODO,
jobId
);
failedLeader.start();
}
SECTION("if we are supposed to fail a distributeShardsLike job we immediately fail because this should be done by a job running on the master shard") {
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder = std::make_unique<Builder>();
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION) {
builder->add("distributeShardsLike", VPackValue("PENG"));
}
if (path == "/arango/Target/ToDo") {
builder->add("1", createBuilder(todo).slice());
}
} else {
builder->add(s);
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
Node agency = createNodeFromBuilder(*builder);
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).AlwaysDo([&](query_t const& q, bool d) -> write_ret_t {
INFO(q->slice().toJson());
REQUIRE(std::string(q->slice().typeName()) == "array" );
REQUIRE(q->slice().length() == 1);
REQUIRE(std::string(q->slice()[0].typeName()) == "array");
REQUIRE(q->slice()[0].length() == 1); // we always simply override! no preconditions...
REQUIRE(std::string(q->slice()[0][0].typeName()) == "object");
auto writes = q->slice()[0][0];
REQUIRE(std::string(writes.get("/arango/Target/ToDo/1").typeName()) == "object");
REQUIRE(std::string(writes.get("/arango/Target/ToDo/1").get("op").typeName()) == "string");
CHECK(writes.get("/arango/Target/ToDo/1").get("op").copyString() == "delete");
CHECK(std::string(writes.get("/arango/Target/Failed/1").typeName()) == "object");
return fakeWriteResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
AgentInterface &agent = mockAgent.get();
auto failedLeader = FailedLeader(
agency("arango"),
&agent,
JOB_STATUS::TODO,
jobId
);
failedLeader.start();
}
SECTION("if the leader is healthy again we fail the job") {
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder = std::make_unique<Builder>();
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Supervision/Health/" + SHARD_LEADER) {
builder->add("Status", VPackValue("GOOD"));
}
if (path == "/arango/Target/ToDo") {
builder->add("1", createBuilder(todo).slice());
}
} else {
builder->add(s);
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
Node agency = createNodeFromBuilder(*builder);
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, transact)).Do([&](query_t const& q) -> trans_ret_t {
INFO("WriteTransaction: " << q->slice().toJson());
auto preconditions = q->slice()[0][1];
REQUIRE(preconditions.get("/arango/Supervision/Health/" + SHARD_LEADER + "/Status").get("old").copyString() == "FAILED");
char const* json = R"=([{"arango":{"Supervision":{"Health":{"leader":{"Status":"GOOD"}}}}}])=";
auto transBuilder = std::make_shared<Builder>(createBuilder(json));
return trans_ret_t(true, "", 0, 1, transBuilder);
});
When(Method(mockAgent, write)).Do([&](query_t const& q, bool d) -> write_ret_t {
INFO("WriteTransaction: " << q->slice().toJson());
auto writes = q->slice()[0][0]; \
REQUIRE(std::string(writes.get("/arango/Target/ToDo/1").get("op").typeName()) == "string"); \
CHECK(std::string(writes.get("/arango/Target/Failed/1").typeName()) == "object");
return fakeWriteResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn();
AgentInterface &agent = mockAgent.get();
auto failedLeader = FailedLeader(
agency(PREFIX),
&agent,
JOB_STATUS::TODO,
jobId
);
REQUIRE_FALSE(failedLeader.start());
Verify(Method(mockAgent, transact));
Verify(Method(mockAgent, write)).Exactly(Once);
}
SECTION("the job must not be started if there is no server that is in sync for every shard") {
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder = std::make_unique<Builder>();
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Target/ToDo") {
builder->add("1", createBuilder(todo).slice());
}
} else {
if (path == "/arango/Current/Collections/" + DATABASE + "/" + COLLECTION + "/" + SHARD + "/servers") {
VPackArrayBuilder a(builder.get());
builder->add(VPackValue(SHARD_LEADER));
} else {
builder->add(s);
}
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
INFO(builder->toJson());
Node agency = createNodeFromBuilder(*builder);
// nothing should happen
Mock<AgentInterface> mockAgent;
AgentInterface &agent = mockAgent.get();
auto failedLeader = FailedLeader(
agency("arango"),
&agent,
JOB_STATUS::TODO,
jobId
);
REQUIRE_FALSE(failedLeader.start());
}
SECTION("the job must not be started if there if one of the linked shards (distributeShardsLike) is not in sync") {
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder = std::make_unique<Builder>();
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Current/Collections/" + DATABASE) {
// we fake that follower2 is in sync
char const* json1 =
R"=({"s100":{"servers":["leader","follower2"]}})=";
builder->add("linkedcollection1", createBuilder(json1).slice());
// for the other shard there is only follower1 in sync
char const* json2 =
R"=({"s101":{"servers":["leader","follower1"]}})=";
builder->add("linkedcollection2", createBuilder(json2).slice());
} else if (path == "/arango/Plan/Collections/" + DATABASE) {
char const* json1 = R"=({"distributeShardsLike":"collection","shards":
{"s100":["leader","follower1","follower2"]}})=";
builder->add("linkedcollection1", createBuilder(json1).slice());
char const* json2 = R"=({"distributeShardsLike":"collection","shards":
{"s101":["leader","follower1","follower2"]}})=";
builder->add("linkedcollection2", createBuilder(json2).slice());
} else if (path == "/arango/Target/ToDo") {
builder->add("1", createBuilder(todo).slice());
}
builder->close();
} else {
builder->add(s);
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
INFO("Agency: " << builder->toJson());
Node agency = createNodeFromBuilder(*builder);
// nothing should happen
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, transact)).AlwaysDo([&](query_t const& q) -> trans_ret_t {
INFO("WriteTransaction: " << q->slice().toJson());
REQUIRE(false);
return trans_ret_t();
});
AgentInterface &agent = mockAgent.get();
auto failedLeader = FailedLeader(
agency("arango"),
&agent,
JOB_STATUS::TODO,
jobId
);
failedLeader.start();
}
SECTION("abort any moveShard job blocking the shard and start") {
Mock<AgentInterface> moveShardMockAgent;
Builder moveShardBuilder;
When(Method(moveShardMockAgent, write)).Do([&](query_t const& q, bool d) -> write_ret_t {
INFO("WriteTransaction(create): " << q->slice().toJson());
REQUIRE(std::string(q->slice().typeName()) == "array" );
REQUIRE(q->slice().length() == 1);
REQUIRE(std::string(q->slice()[0].typeName()) == "array");
REQUIRE(q->slice()[0].length() > 0); // preconditions!
REQUIRE(std::string(q->slice()[0][0].typeName()) == "object");
REQUIRE(std::string(q->slice()[0][0].get("/arango/Target/ToDo/2").typeName()) == "object");
moveShardBuilder.add(q->slice()[0][0].get("/arango/Target/ToDo/2"));
return fakeWriteResult;
});
When(Method(moveShardMockAgent, waitFor)).Return();
AgentInterface &moveShardAgent = moveShardMockAgent.get();
auto moveShard = MoveShard(
baseStructure("arango"), &moveShardAgent, "2", "strunz", DATABASE,
COLLECTION, SHARD, SHARD_LEADER, FREE_SERVER, true);
moveShard.create();
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder(new Builder());
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Supervision/Shards") {
builder->add(SHARD, VPackValue("2"));
} else if (path == "/arango/Target/ToDo") {
builder->add("1", createBuilder(todo).slice());
} else if (path == "/arango/Target/Pending") {
builder->add("2", moveShardBuilder.slice());
}
} else {
if (path == "/arango/Current/Collections/" + DATABASE + "/" +
COLLECTION + "/" + SHARD + "/servers") {
VPackArrayBuilder a(builder.get());
builder->add(VPackValue(SHARD_LEADER));
builder->add(VPackValue(SHARD_FOLLOWER2));
} else {
builder->add(s);
}
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
INFO("Teststructure: " << builder->toJson());
Node agency = createNodeFromBuilder(*builder);
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).Do([&](query_t const& q, bool d) -> write_ret_t {
// check that moveshard is being moved to failed
INFO("WriteTransaction: " << q->slice().toJson());
REQUIRE(std::string(q->slice().typeName()) == "array");
REQUIRE(q->slice().length() == 1);
REQUIRE(std::string(q->slice()[0].typeName()) == "array");
REQUIRE(std::string(q->slice()[0][0].typeName()) == "object");
REQUIRE(std::string(q->slice()[0][0].get("/arango/Target/Failed/2").typeName()) == "object");
return fakeWriteResult;
});
When(Method(mockAgent, transact)).Do([&](query_t const& q) -> trans_ret_t {
// check that the job is now pending
INFO("Transaction: " << q->slice().toJson());
auto writes = q->slice()[0][0];
REQUIRE(std::string(writes.get("/arango/Target/Pending/1").typeName()) == "object");
return fakeTransResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
AgentInterface &agent = mockAgent.get();
auto failedLeader = FailedLeader(
agency("arango"),
&agent,
JOB_STATUS::TODO,
jobId
);
failedLeader.start();
Verify(Method(mockAgent, transact));
Verify(Method(mockAgent, write));
}
SECTION("if everything is fine than the job should be written to pending, adding the toServer") {
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder(new Builder());
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Target/ToDo") {
builder->add("1", createBuilder(todo).slice());
}
} else {
if (path == "/arango/Current/Collections/" + DATABASE + "/" + COLLECTION + "/" + SHARD + "/servers") {
VPackArrayBuilder a(builder.get());
builder->add(VPackValue(SHARD_LEADER));
builder->add(VPackValue(SHARD_FOLLOWER2));
} else {
builder->add(s);
}
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
INFO("Teststructure: " << builder->toJson());
Node agency = createNodeFromBuilder(*builder);
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, transact)).AlwaysDo([&](query_t const& q) -> trans_ret_t {
INFO("WriteTransaction: " << q->slice().toJson());
REQUIRE(std::string(q->slice().typeName()) == "array" );
REQUIRE(q->slice().length() == 1);
REQUIRE(std::string(q->slice()[0].typeName()) == "array");
REQUIRE(q->slice()[0].length() == 2); // preconditions!
REQUIRE(std::string(q->slice()[0][0].typeName()) == "object");
REQUIRE(std::string(q->slice()[0][1].typeName()) == "object");
auto writes = q->slice()[0][0];
REQUIRE(std::string(writes.get("/arango/Target/ToDo/1").typeName()) == "object");
REQUIRE(std::string(writes.get("/arango/Target/ToDo/1").get("op").typeName()) == "string");
CHECK(writes.get("/arango/Target/ToDo/1").get("op").copyString() == "delete");
CHECK(std::string(writes.get("/arango/Target/ToDo/1").typeName()) == "object");
REQUIRE(std::string(writes.get("/arango/Target/Pending/1").typeName()) == "object");
auto job = writes.get("/arango/Target/Pending/1");
REQUIRE(std::string(job.get("toServer").typeName()) == "string");
CHECK(job.get("toServer").copyString() == SHARD_FOLLOWER2);
CHECK(std::string(job.get("timeStarted").typeName()) == "string");
REQUIRE(std::string(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).typeName()) == "array");
REQUIRE(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).length() == 4);
REQUIRE(std::string(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD)[0].typeName()) == "string");
REQUIRE(std::string(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD)[1].typeName()) == "string");
REQUIRE(std::string(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD)[2].typeName()) == "string");
REQUIRE(std::string(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD)[3].typeName()) == "string");
CHECK(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD)[0].copyString() == SHARD_FOLLOWER2);
CHECK(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD)[1].copyString() == SHARD_LEADER);
CHECK(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD)[2].copyString() == SHARD_FOLLOWER1);
CHECK(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD)[3].copyString().compare(0,4,FREE_SERVER) == 0);
auto preconditions = q->slice()[0][1];
REQUIRE(std::string(preconditions.get("/arango/Supervision/Shards/" + SHARD).typeName()) == "object");
REQUIRE(std::string(preconditions.get("/arango/Supervision/Shards/" + SHARD).get("oldEmpty").typeName()) == "bool");
CHECK(preconditions.get("/arango/Supervision/Shards/" + SHARD).get("oldEmpty").getBool() == true);
CHECK(preconditions.get("/arango/Supervision/Health/" + SHARD_LEADER + "/Status").get("old").copyString() == "FAILED");
CHECK(preconditions.get("/arango/Supervision/Health/" + SHARD_FOLLOWER2 + "/Status").get("old").copyString() == "GOOD");
REQUIRE(std::string(preconditions.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).typeName()) == "object");
REQUIRE(std::string(preconditions.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).get("old").typeName()) == "array");
REQUIRE(preconditions.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).get("old").length() == 3);
REQUIRE(std::string(preconditions.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).get("old")[0].typeName()) == "string");
REQUIRE(std::string(preconditions.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).get("old")[1].typeName()) == "string");
REQUIRE(std::string(preconditions.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).get("old")[2].typeName()) == "string");
CHECK(preconditions.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).get("old")[0].copyString() == SHARD_LEADER);
CHECK(preconditions.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).get("old")[1].copyString() == SHARD_FOLLOWER1);
CHECK(preconditions.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).get("old")[2].copyString() == SHARD_FOLLOWER2);
auto result = std::make_shared<Builder>();
result->openArray();
result->add(VPackValue((uint64_t)1));
result->close();
return trans_ret_t(true, "1", 1, 0, result);
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
AgentInterface &agent = mockAgent.get();
// new server will randomly be selected...so seed the random number generator
srand(1);
auto failedLeader = FailedLeader(
agency("arango"),
&agent,
JOB_STATUS::TODO,
jobId
);
failedLeader.start();
}
SECTION("if we want are working and our collection went missing from plan the job should just finish") {
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder;
if (path == "/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION) {
return builder;
}
builder.reset(new Builder());
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Target/Pending") {
Builder jobBuilder;
{ VPackObjectBuilder b(&jobBuilder);
jobBuilder.add("creator", VPackValue("1"));
jobBuilder.add("type", VPackValue("failedLeader"));
jobBuilder.add("database", VPackValue(DATABASE));
jobBuilder.add("collection", VPackValue(COLLECTION));
jobBuilder.add("shard", VPackValue(SHARD));
jobBuilder.add("fromServer", VPackValue(SHARD_LEADER));
jobBuilder.add("toServer", VPackValue(SHARD_FOLLOWER1));
jobBuilder.add("jobId", VPackValue(jobId));
jobBuilder.add("timeCreated", VPackValue("2017-01-01 00:00:00"));}
builder->add("1", jobBuilder.slice());
}
} else {
builder->add(s);
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
Node agency = createNodeFromBuilder(*builder);
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).AlwaysDo([&](query_t const& q, bool d) -> write_ret_t {
INFO(q->slice().toJson());
REQUIRE(std::string(q->slice().typeName()) == "array" );
REQUIRE(q->slice().length() == 1);
REQUIRE(std::string(q->slice()[0].typeName()) == "array");
REQUIRE(q->slice()[0].length() == 1); // we always simply override! no preconditions...
REQUIRE(std::string(q->slice()[0][0].typeName()) == "object");
auto writes = q->slice()[0][0];
REQUIRE(std::string(writes.get("/arango/Target/ToDo/1").typeName()) == "object");
REQUIRE(std::string(writes.get("/arango/Target/ToDo/1").get("op").typeName()) == "string");
CHECK(writes.get("/arango/Target/ToDo/1").get("op").copyString() == "delete");
CHECK(std::string(writes.get("/arango/Target/Finished/1").typeName()) == "object");
return fakeWriteResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
AgentInterface &agent = mockAgent.get();
INFO("Agency: " << agency);
auto failedLeader = FailedLeader(
agency("arango"),
&agent,
JOB_STATUS::PENDING,
jobId
);
failedLeader.run();
}
SECTION("if the newly supposed leader didn't catch up yet we wait") {
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder = std::make_unique<Builder>();
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Target/Pending") {
Builder jobBuilder;
{ VPackObjectBuilder b(&jobBuilder);
jobBuilder.add("creator", VPackValue("1"));
jobBuilder.add("type", VPackValue("failedLeader"));
jobBuilder.add("database", VPackValue(DATABASE));
jobBuilder.add("collection", VPackValue(COLLECTION));
jobBuilder.add("shard", VPackValue(SHARD));
jobBuilder.add("fromServer", VPackValue(SHARD_LEADER));
jobBuilder.add("toServer", VPackValue(SHARD_FOLLOWER1));
jobBuilder.add("jobId", VPackValue(jobId));
jobBuilder.add("timeCreated", VPackValue(
timepointToString(std::chrono::system_clock::now())));}
builder->add("1", jobBuilder.slice());
}
} else {
if (path == "/arango/Current/Collections/" + DATABASE + "/" + COLLECTION + "/" + SHARD + "/servers") {
VPackArrayBuilder a(builder.get());
builder->add(VPackValue(SHARD_LEADER));
builder->add(VPackValue(SHARD_FOLLOWER1));
} else if (path == "/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD) {
VPackArrayBuilder a(builder.get());
builder->add(VPackValue(SHARD_FOLLOWER1));
builder->add(VPackValue(SHARD_LEADER));
} else {
builder->add(s);
}
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
Node agency = createNodeFromBuilder(*builder);
Mock<AgentInterface> mockAgent;
AgentInterface &agent = mockAgent.get();
INFO("Agency: " << agency);
auto failedLeader = FailedLeader(
agency("arango"),
&agent,
JOB_STATUS::PENDING,
jobId
);
failedLeader.run();
}
SECTION("in case of a timeout the job should be aborted") {
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder = std::make_unique<Builder>();
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Target/Pending") {
Builder jobBuilder;
{ VPackObjectBuilder b(&jobBuilder);
jobBuilder.add("creator", VPackValue("1"));
jobBuilder.add("type", VPackValue("failedLeader"));
jobBuilder.add("database", VPackValue(DATABASE));
jobBuilder.add("collection", VPackValue(COLLECTION));
jobBuilder.add("shard", VPackValue(SHARD));
jobBuilder.add("fromServer", VPackValue(SHARD_LEADER));
jobBuilder.add("toServer", VPackValue(SHARD_FOLLOWER1));
jobBuilder.add("jobId", VPackValue(jobId));
jobBuilder.add("timeCreated", VPackValue("2015-01-03T20:00:00Z"));}
builder->add("1", jobBuilder.slice());
}
} else {
if (path == "/arango/Current/Collections/" + DATABASE + "/" + COLLECTION + "/" + SHARD + "/servers") {
VPackArrayBuilder a(builder.get());
builder->add(VPackValue(SHARD_LEADER));
builder->add(VPackValue(SHARD_FOLLOWER1));
} else if (path == "/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD) {
VPackArrayBuilder a(builder.get());
builder->add(VPackValue(SHARD_FOLLOWER1));
builder->add(VPackValue(SHARD_LEADER));
} else {
builder->add(s);
}
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
Node agency = createNodeFromBuilder(*builder);
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).Do([&](query_t const& q, bool d) -> write_ret_t {
INFO(q->slice().toJson());
REQUIRE(std::string(q->slice().typeName()) == "array" );
REQUIRE(q->slice().length() == 1);
REQUIRE(std::string(q->slice()[0].typeName()) == "array");
REQUIRE(q->slice()[0].length() == 1); // we always simply override! no preconditions...
REQUIRE(std::string(q->slice()[0][0].typeName()) == "object");
auto writes = q->slice()[0][0];
REQUIRE(std::string(writes.get("/arango/Target/Pending/1").typeName()) == "object");
REQUIRE(std::string(writes.get("/arango/Target/Pending/1").get("op").typeName()) == "string");
CHECK(writes.get("/arango/Target/Pending/1").get("op").copyString() == "delete");
CHECK(std::string(writes.get("/arango/Target/Failed/1").typeName()) == "object");
REQUIRE(std::string(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD).typeName()) == "array");
CHECK(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD)[0].copyString() == SHARD_LEADER);
CHECK(writes.get("/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD)[1].copyString() == SHARD_FOLLOWER1);
return fakeWriteResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
AgentInterface &agent = mockAgent.get();
INFO("Agency: " << agency);
auto failedLeader = FailedLeader(
agency("arango"),
&agent,
JOB_STATUS::PENDING,
jobId
);
failedLeader.run();
Verify(Method(mockAgent, write));
}
SECTION("when everything is finished there should be proper cleanup") {
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder = std::make_unique<Builder>();
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Target/Pending") {
Builder jobBuilder;
{ VPackObjectBuilder b(&jobBuilder);
jobBuilder.add("creator", VPackValue("1"));
jobBuilder.add("type", VPackValue("failedLeader"));
jobBuilder.add("database", VPackValue(DATABASE));
jobBuilder.add("collection", VPackValue(COLLECTION));
jobBuilder.add("shard", VPackValue(SHARD));
jobBuilder.add("fromServer", VPackValue(SHARD_LEADER));
jobBuilder.add("toServer", VPackValue(SHARD_FOLLOWER1));
jobBuilder.add("jobId", VPackValue(jobId));
jobBuilder.add("timeCreated", VPackValue(
timepointToString(std::chrono::system_clock::now())));}
builder->add("1", jobBuilder.slice());
}
builder->close();
} else {
if (path == "/arango/Current/Collections/" + DATABASE + "/" + COLLECTION + "/" + SHARD + "/servers") {
VPackArrayBuilder a(builder.get());
builder->add(VPackValue(SHARD_FOLLOWER1));
} else if (path == "/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD) {
VPackArrayBuilder a(builder.get());
builder->add(VPackValue(SHARD_FOLLOWER1));
builder->add(VPackValue(SHARD_LEADER));
} else {
builder->add(s);
}
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
Node agency = createNodeFromBuilder(*builder);
size_t numWrites = 0;
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).AlwaysDo([&](query_t const& q, bool d) -> write_ret_t {
INFO("Write: " << q->slice().toJson());
numWrites++;
if (numWrites == 1) {
REQUIRE(std::string(q->slice().typeName()) == "array" );
REQUIRE(std::string(q->slice()[0][0].typeName()) == "object");
REQUIRE(q->slice()[0][0].length() == 1);
auto writes = q->slice()[0][0];
REQUIRE(std::string(writes.get("/arango/Target/FailedServers/" + SHARD_LEADER).typeName()) == "object");
REQUIRE(writes.get("/arango/Target/FailedServers/" + SHARD_LEADER).get("op").copyString() == "erase");
REQUIRE(writes.get("/arango/Target/FailedServers/" + SHARD_LEADER).get("val").copyString() == SHARD);
return fakeWriteResult;
} else {
REQUIRE(std::string(q->slice().typeName()) == "array" );
REQUIRE(q->slice().length() == 1);
REQUIRE(std::string(q->slice()[0].typeName()) == "array");
REQUIRE(q->slice()[0].length() == 1); // we always simply override! no preconditions...
REQUIRE(std::string(q->slice()[0][0].typeName()) == "object");
auto writes = q->slice()[0][0];
REQUIRE(std::string(writes.get("/arango/Supervision/Shards/" + SHARD).typeName()) == "object");
REQUIRE(writes.get("/arango/Supervision/Shards/" + SHARD).get("op").copyString() == "delete");
REQUIRE(std::string(writes.get("/arango/Target/Pending/1").get("op").typeName()) == "string");
CHECK(writes.get("/arango/Target/Pending/1").get("op").copyString() == "delete");
CHECK(std::string(writes.get("/arango/Target/Finished/1").typeName()) == "object");
return fakeWriteResult;
}
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
AgentInterface &agent = mockAgent.get();
INFO("Agency: " << agency);
auto failedLeader = FailedLeader(
agency("arango"),
&agent,
JOB_STATUS::PENDING,
jobId
);
failedLeader.run();
Verify(Method(mockAgent, write));
}
SECTION("a failedleader must not take a follower into account that is in sync but has been dropped out of the plan") {
std::string jobId = "1";
TestStructureType createTestStructure = [&](Slice const& s, std::string const& path) {
std::unique_ptr<Builder> builder(new Builder());
if (s.isObject()) {
VPackObjectBuilder b(builder.get());
for (auto const& it: VPackObjectIterator(s)) {
auto childBuilder = createTestStructure(it.value, path + "/" + it.key.copyString());
if (childBuilder) {
builder->add(it.key.copyString(), childBuilder->slice());
}
}
if (path == "/arango/Target/ToDo") {
builder->add("1", createBuilder(todo).slice());
}
} else {
if (path == "/arango/Current/Collections/" + DATABASE + "/" + COLLECTION + "/" + SHARD + "/servers") {
// follower2 in sync
VPackArrayBuilder a(builder.get());
builder->add(VPackValue(SHARD_LEADER));
builder->add(VPackValue(SHARD_FOLLOWER2));
} else if (path == "/arango/Plan/Collections/" + DATABASE + "/" + COLLECTION + "/shards/" + SHARD) {
// but not part of the plan => will drop collection on next occasion
VPackArrayBuilder a(builder.get());
builder->add(VPackValue(SHARD_LEADER));
builder->add(VPackValue(SHARD_FOLLOWER1));
} else {
builder->add(s);
}
}
return builder;
};
auto builder = createTestStructure(baseStructure.toBuilder().slice(), "");
REQUIRE(builder);
INFO("Teststructure: " << builder->toJson());
Node agency = createNodeFromBuilder(*builder);
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, transact)).AlwaysDo([&](query_t const& q) -> trans_ret_t {
INFO("Transaction: " << q->slice().toJson());
// must NOT be called!
REQUIRE(false);
return fakeTransResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
AgentInterface &agent = mockAgent.get();
// new server will randomly be selected...so seed the random number generator
srand(1);
auto failedLeader = FailedLeader(
agency("arango"),
&agent,
JOB_STATUS::TODO,
jobId
);
failedLeader.start();
}
}
}
}
}
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