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arangodb/tests/Agency/ActiveFailoverTest.cpp

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////////////////////////////////////////////////////////////////////////////////
/// @brief test case for ActiverFailover job
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2018 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 Simon Grätzer
////////////////////////////////////////////////////////////////////////////////
#include "gtest/gtest.h"
#include "fakeit.hpp"
#include <velocypack/Collection.h>
#include <velocypack/Parser.h>
#include <velocypack/Slice.h>
#include <velocypack/velocypack-aliases.h>
#include <iostream>
#include "Agency/ActiveFailoverJob.h"
#include "Agency/AgentInterface.h"
#include "Agency/Node.h"
#include "lib/Basics/StringUtils.h"
#include "lib/Random/RandomGenerator.h"
using namespace arangodb;
using namespace arangodb::basics;
using namespace arangodb::consensus;
using namespace fakeit;
namespace arangodb {
namespace tests {
namespace active_failover_test {
const std::string PREFIX = "arango";
const std::string LEADER = "SNGL-leader";
const std::string FOLLOWER1 = "SNGL-follower1"; // tick 10, STATE GOOD
const std::string FOLLOWER2 = "SNGL-follower2"; // tick 1, STATE GOOD
const std::string FOLLOWER3 = "SNGL-follower23"; // tick 9, STATE GOOD
const std::string FOLLOWER4 = "SNGL-follower4"; // tick 100, STATE BAD
const std::string FOLLOWER5 = "SNGL-follower5"; // tick 1000, STATE GOOD wrong leader
bool aborts = false;
const char* agency =
#include "ActiveFailoverTest.json"
;
const char* transient =
#include "ActiveFailoverTestTransient.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) {
Options options;
options.checkAttributeUniqueness = true;
VPackParser parser(&options);
parser.parse(c);
Builder builder;
builder.add(parser.steal()->slice());
return builder;
}
typedef std::function<std::unique_ptr<Builder>(Slice const&, std::string const&)> TestStructType;
inline static std::string typeName(Slice const& slice) {
return std::string(slice.typeName());
}
class ActiveFailover : public ::testing::Test {
protected:
Builder base;
std::string jobId;
write_ret_t fakeWriteResult;
ActiveFailover()
: jobId{"1"},
fakeWriteResult{true, "", std::vector<apply_ret_t>{APPLIED},
std::vector<index_t>{1}} {
arangodb::RandomGenerator::initialize(arangodb::RandomGenerator::RandomType::MERSENNE);
base = createBuilder(agency);
jobId = "1";
}
};
TEST_F(ActiveFailover, creating_a_job_should_create_a_job_in_todo) {
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).AlwaysDo([&](query_t const& q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
auto expectedJobKey = "/arango/Target/ToDo/" + jobId;
EXPECT_TRUE(typeName(q->slice()) == "array");
EXPECT_TRUE(q->slice().length() == 1);
EXPECT_TRUE(typeName(q->slice()[0]) == "array");
// operations + preconditions
EXPECT_TRUE(q->slice()[0].length() == 2);
EXPECT_TRUE(typeName(q->slice()[0][0]) == "object");
EXPECT_TRUE(q->slice()[0][0].length() == 2); // should do an entry in todo and failedservers
EXPECT_TRUE(typeName(q->slice()[0][0].get(expectedJobKey)) == "object");
auto job = q->slice()[0][0].get(expectedJobKey);
EXPECT_TRUE(typeName(job.get("creator")) == "string");
EXPECT_TRUE(typeName(job.get("type")) == "string");
EXPECT_TRUE(job.get("type").copyString() == "activeFailover");
EXPECT_TRUE(typeName(job.get("server")) == "string");
EXPECT_TRUE(job.get("server").copyString() == LEADER);
EXPECT_TRUE(typeName(job.get("jobId")) == "string");
EXPECT_TRUE(job.get("jobId").copyString() == jobId);
EXPECT_TRUE(typeName(job.get("timeCreated")) == "string");
return fakeWriteResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
auto& agent = mockAgent.get();
Node snapshot = createNodeFromBuilder(base);
ActiveFailoverJob job(snapshot(PREFIX), &agent, jobId, "tests", LEADER);
ASSERT_TRUE(job.create());
Verify(Method(mockAgent, write));
}
TEST_F(ActiveFailover, the_state_is_already_good_and_failservers_is_still_in_the_snapshot) {
const char* tt = R"=({"arango":{"Supervision":{"Health":{"SNGL-leader":{"Status":"GOOD"}}}}})=";
VPackBuilder overw = createBuilder(tt);
VPackBuilder mod = VPackCollection::merge(base.slice(), overw.slice(), true);
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).AlwaysDo([&](query_t const& q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
EXPECT_TRUE(typeName(q->slice()) == "array");
EXPECT_TRUE(q->slice().length() == 1);
EXPECT_TRUE(typeName(q->slice()[0]) == "array");
// operations + preconditions
EXPECT_TRUE(q->slice()[0].length() == 2);
EXPECT_TRUE(typeName(q->slice()[0][0]) == "object");
EXPECT_TRUE(typeName(q->slice()[0][1]) == "object");
auto writes = q->slice()[0][0];
EXPECT_TRUE(typeName(writes.get("/arango/Target/ToDo/1")) == "object");
EXPECT_TRUE(writes.get("/arango/Target/ToDo/1").get("server").copyString() == LEADER);
auto precond = q->slice()[0][1];
EXPECT_TRUE(typeName(precond.get(
"/arango/Supervision/Health/SNGL-leader/Status")) ==
"object");
EXPECT_TRUE(
precond.get("/arango/Supervision/Health/SNGL-leader/Status").get("old").copyString() ==
"BAD");
EXPECT_TRUE(typeName(precond.get("/arango/Target/FailedServers").get("old")) ==
"object");
return write_ret_t{false, "", std::vector<apply_ret_t>{APPLIED},
std::vector<index_t>{0}};
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
auto& agent = mockAgent.get();
Node snapshot = createNodeFromBuilder(mod);
ActiveFailoverJob job(snapshot(PREFIX), &agent, jobId, "unittest", LEADER);
ASSERT_FALSE(job.create());
ASSERT_TRUE(job.status() == JOB_STATUS::NOTFOUND);
Verify(Method(mockAgent, write));
}
TEST_F(ActiveFailover, server_is_healthy_again_job_finishes) {
const char* health = R"=({"arango":{"Supervision":{"Health":{"SNGL-leader":{"Status":"GOOD"}}},
"Target":{"ToDo":{"1":{"jobId":"1","type":"activeFailover"}}}}})=";
VPackBuilder mod =
VPackCollection::merge(base.slice(), createBuilder(health).slice(), true);
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).Do([&](query_t const& q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
EXPECT_TRUE(typeName(q->slice()) == "array");
EXPECT_TRUE(q->slice().length() == 1);
EXPECT_TRUE(typeName(q->slice()[0]) == "array");
// operations + preconditions
EXPECT_TRUE(q->slice()[0].length() == 2);
EXPECT_TRUE(typeName(q->slice()[0][0]) == "object");
EXPECT_TRUE(typeName(q->slice()[0][1]) == "object");
auto writes = q->slice()[0][0];
EXPECT_TRUE(typeName(writes.get("/arango/Target/ToDo/1")) == "object");
EXPECT_TRUE(writes.get("/arango/Target/ToDo/1").get("server").copyString() == LEADER);
auto precond = q->slice()[0][1];
EXPECT_TRUE(typeName(precond.get(
"/arango/Supervision/Health/SNGL-leader/Status")) ==
"object");
EXPECT_TRUE(
precond.get("/arango/Supervision/Health/SNGL-leader/Status").get("old").copyString() ==
"BAD");
EXPECT_TRUE(typeName(precond.get("/arango/Target/FailedServers").get("old")) ==
"object");
return fakeWriteResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
auto& agent = mockAgent.get();
Node snapshot = createNodeFromBuilder(mod); // snapshort contains GOOD leader
ActiveFailoverJob job(snapshot(PREFIX), &agent, jobId, "unittest", LEADER);
ASSERT_TRUE(job.create()); // we already put the TODO entry in the snapshot for finish
ASSERT_TRUE(job.status() == JOB_STATUS::TODO);
Verify(Method(mockAgent, write)).Exactly(1);
When(Method(mockAgent, write)).Do([&](query_t const& q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
// check that the job finishes now, without changing leader
VPackSlice writes = q->slice()[0][0];
EXPECT_TRUE(typeName(writes.get("/arango/Target/ToDo/1").get("op")) ==
"string");
EXPECT_TRUE(typeName(writes.get("/arango/Target/Finished/1")) == "object");
EXPECT_FALSE(writes.hasKey("/arango" + asyncReplLeader)); // no change to leader
return fakeWriteResult;
});
ASSERT_TRUE(job.start(aborts));
ASSERT_TRUE(job.status() == JOB_STATUS::FINISHED);
Verify(Method(mockAgent, write)).Exactly(2);
}
TEST_F(ActiveFailover, current_leader_is_different_from_server_in_job) {
const char* health = R"=({"arango":{"Plan":{"AsyncReplication":{"Leader":"SNGL-follower1"}},
"Target":{"ToDo":{"1":{"jobId":"1","type":"activeFailover"}}}}})=";
VPackBuilder mod =
VPackCollection::merge(base.slice(), createBuilder(health).slice(), true);
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).Do([&](query_t const& q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
EXPECT_TRUE(typeName(q->slice()) == "array");
EXPECT_TRUE(q->slice().length() == 1);
EXPECT_TRUE(typeName(q->slice()[0]) == "array");
// operations + preconditions
EXPECT_TRUE(q->slice()[0].length() == 2);
EXPECT_TRUE(typeName(q->slice()[0][0]) == "object");
EXPECT_TRUE(typeName(q->slice()[0][1]) == "object");
auto writes = q->slice()[0][0];
EXPECT_TRUE(typeName(writes.get("/arango/Target/ToDo/1")) == "object");
EXPECT_TRUE(writes.get("/arango/Target/ToDo/1").get("server").copyString() == LEADER);
auto precond = q->slice()[0][1];
EXPECT_TRUE(typeName(precond.get(
"/arango/Supervision/Health/SNGL-leader/Status")) ==
"object");
EXPECT_TRUE(
precond.get("/arango/Supervision/Health/SNGL-leader/Status").get("old").copyString() ==
"BAD");
EXPECT_TRUE(typeName(precond.get("/arango/Target/FailedServers").get("old")) ==
"object");
return fakeWriteResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
auto& agent = mockAgent.get();
Node snapshot = createNodeFromBuilder(mod); // snapshort contains different leader
ActiveFailoverJob job(snapshot(PREFIX), &agent, jobId, "unittest", LEADER);
ASSERT_TRUE(job.create()); // we already put the TODO entry in the snapshot for finish
ASSERT_TRUE(job.status() == JOB_STATUS::TODO);
Verify(Method(mockAgent, write)).Exactly(1);
When(Method(mockAgent, write)).Do([&](query_t const& q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
// check that the job finishes now, without changing leader
VPackSlice writes = q->slice()[0][0];
EXPECT_TRUE(typeName(writes.get("/arango/Target/ToDo/1").get("op")) ==
"string");
EXPECT_TRUE(typeName(writes.get("/arango/Target/Finished/1")) == "object");
EXPECT_FALSE(writes.hasKey("/arango" + asyncReplLeader)); // no change to leader
return fakeWriteResult;
});
ASSERT_TRUE(job.start(aborts));
ASSERT_TRUE(job.status() == JOB_STATUS::FINISHED);
Verify(Method(mockAgent, write)).Exactly(2);
} // SECTION
TEST_F(ActiveFailover, no_in_sync_follower_found_job_retries) {
// follower follows wrong leader
const char* noInSync =
R"=({"arango":{"AsyncReplication":{"SNGL-follower1":{"leader":"abc","lastTick":9}}}})=";
trans_ret_t fakeTransient{true, "", 1, 0,
std::make_shared<Builder>(createBuilder(noInSync))};
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).Do([&](query_t const& q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
EXPECT_TRUE(typeName(q->slice()) == "array");
EXPECT_TRUE(q->slice().length() == 1);
EXPECT_TRUE(typeName(q->slice()[0]) == "array");
// operations + preconditions
EXPECT_TRUE(q->slice()[0].length() == 2);
EXPECT_TRUE(typeName(q->slice()[0][0]) == "object");
EXPECT_TRUE(typeName(q->slice()[0][1]) == "object");
auto writes = q->slice()[0][0];
EXPECT_TRUE(typeName(writes.get("/arango/Target/ToDo/1")) == "object");
EXPECT_TRUE(writes.get("/arango/Target/ToDo/1").get("server").copyString() == LEADER);
auto precond = q->slice()[0][1];
EXPECT_TRUE(typeName(precond.get(
"/arango/Supervision/Health/SNGL-leader/Status")) ==
"object");
EXPECT_TRUE(
precond.get("/arango/Supervision/Health/SNGL-leader/Status").get("old").copyString() ==
"BAD");
EXPECT_TRUE(typeName(precond.get("/arango/Target/FailedServers").get("old")) ==
"object");
return fakeWriteResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
auto& agent = mockAgent.get();
Node snapshot = createNodeFromBuilder(base);
ActiveFailoverJob job(snapshot(PREFIX), &agent, jobId, "unittest", LEADER);
ASSERT_TRUE(job.create()); // we already put the TODO entry in the snapshot for finish
ASSERT_TRUE(job.status() == JOB_STATUS::TODO);
Verify(Method(mockAgent, write)).Exactly(1);
When(Method(mockAgent, transient)).Return(fakeTransient);
When(Method(mockAgent, write)).Do([&](query_t const& q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
// check that the job fails now
auto writes = q->slice()[0][0];
EXPECT_TRUE(std::string(writes.get("/arango/Target/ToDo/1").get("op").typeName()) ==
"string");
EXPECT_TRUE(std::string(writes.get("/arango/Target/Failed/1").typeName()) ==
"object");
return fakeWriteResult;
});
ASSERT_FALSE(job.start(aborts));
// job status stays on TODO and can retry later
ASSERT_TRUE(job.status() == JOB_STATUS::TODO);
Verify(Method(mockAgent, transient)).Exactly(Once);
Verify(Method(mockAgent, write)).Exactly(Once); // finish is not called
}
TEST_F(ActiveFailover, follower_with_best_tick_value_used) {
// 2 in-sync followers, follower1 should be used
trans_ret_t fakeTransient{true, "", 1, 0,
std::make_shared<Builder>(createBuilder(transient))};
Mock<AgentInterface> mockAgent;
When(Method(mockAgent, write)).Do([&](query_t const& q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
EXPECT_TRUE(typeName(q->slice()) == "array");
EXPECT_TRUE(q->slice().length() == 1);
EXPECT_TRUE(typeName(q->slice()[0]) == "array");
// we always simply override! no preconditions...
EXPECT_TRUE(q->slice()[0].length() == 2);
EXPECT_TRUE(typeName(q->slice()[0][0]) == "object");
EXPECT_TRUE(typeName(q->slice()[0][1]) == "object");
auto writes = q->slice()[0][0];
EXPECT_TRUE(typeName(writes.get("/arango/Target/ToDo/1")) == "object");
EXPECT_TRUE(writes.get("/arango/Target/ToDo/1").get("server").copyString() == LEADER);
auto precond = q->slice()[0][1];
EXPECT_TRUE(typeName(precond.get(
"/arango/Supervision/Health/SNGL-leader/Status")) ==
"object");
EXPECT_TRUE(
precond.get("/arango/Supervision/Health/SNGL-leader/Status").get("old").copyString() ==
"BAD");
EXPECT_TRUE(typeName(precond.get("/arango/Target/FailedServers").get("old")) ==
"object");
return fakeWriteResult;
});
When(Method(mockAgent, waitFor)).AlwaysReturn(AgentInterface::raft_commit_t::OK);
auto& agent = mockAgent.get();
Node snapshot = createNodeFromBuilder(base);
ActiveFailoverJob job(snapshot(PREFIX), &agent, jobId, "unittest", LEADER);
ASSERT_TRUE(job.create()); // we already put the TODO entry in the snapshot for finish
ASSERT_TRUE(job.status() == JOB_STATUS::TODO);
Verify(Method(mockAgent, write)).Exactly(1);
When(Method(mockAgent, transient)).Return(fakeTransient);
When(Method(mockAgent, write)).Do([&](query_t const& q, consensus::AgentInterface::WriteMode w) -> write_ret_t {
EXPECT_TRUE(typeName(q->slice()) == "array");
EXPECT_TRUE(q->slice().length() == 1);
EXPECT_TRUE(typeName(q->slice()[0]) == "array");
// we always simply override! no preconditions...
EXPECT_TRUE(q->slice()[0].length() == 2);
EXPECT_TRUE(typeName(q->slice()[0][0]) == "object");
EXPECT_TRUE(typeName(q->slice()[0][1]) == "object");
// check that the job succeeds now
auto writes = q->slice()[0][0];
EXPECT_TRUE(typeName(writes.get("/arango/Target/ToDo/1").get("op")) ==
"string");
EXPECT_TRUE(typeName(writes.get("/arango/Target/Finished/1")) == "object");
EXPECT_TRUE(typeName(writes.get("/arango/Plan/AsyncReplication/Leader")) ==
"string");
EXPECT_TRUE(writes.get("/arango/Plan/AsyncReplication/Leader").copyString() == FOLLOWER1);
auto precond = q->slice()[0][1];
EXPECT_TRUE(typeName(precond.get(
"/arango/Supervision/Health/SNGL-leader/Status")) ==
"object");
EXPECT_TRUE(
precond.get("/arango/Supervision/Health/SNGL-leader/Status").get("old").copyString() ==
"FAILED");
EXPECT_TRUE(precond.get("/arango/Supervision/Health/SNGL-follower1/Status")
.get("old")
.copyString() == "GOOD");
EXPECT_TRUE(precond.get("/arango/Plan/AsyncReplication/Leader").get("old").copyString() ==
LEADER);
return fakeWriteResult;
});
ASSERT_TRUE(job.start(aborts));
// job status stays on TODO and can retry later
ASSERT_TRUE(job.status() == JOB_STATUS::FINISHED);
Verify(Method(mockAgent, transient)).Exactly(1);
Verify(Method(mockAgent, write)).Exactly(2);
}
} // namespace active_failover_test
} // namespace tests
} // namespace arangodb
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