| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| |
| |
| #include <gtest/gtest.h> |
| #include <string> |
| |
| #include "kudu/gutil/bind.h" |
| #include "kudu/gutil/gscoped_ptr.h" |
| #include "kudu/util/countdown_latch.h" |
| #include "kudu/util/failure_detector.h" |
| #include "kudu/util/locks.h" |
| #include "kudu/util/monotime.h" |
| #include "kudu/util/status.h" |
| #include "kudu/util/test_util.h" |
| |
| namespace kudu { |
| |
| // How often we expect a node to heartbeat to assert its "aliveness". |
| static const int kExpectedHeartbeatPeriodMillis = 100; |
| |
| // Number of heartbeats after which the FD will consider the node dead. |
| static const int kMaxMissedHeartbeats = 2; |
| |
| // Let's check for failures every 100ms on average +/- 10ms. |
| static const int kFailureMonitorMeanMillis = 100; |
| static const int kFailureMonitorStddevMillis = 10; |
| |
| static const char* kNodeName = "node-1"; |
| static const char* kTestTabletName = "test-tablet"; |
| |
| class FailureDetectorTest : public KuduTest { |
| public: |
| FailureDetectorTest() |
| : KuduTest(), |
| latch_(1), |
| monitor_(new RandomizedFailureMonitor(SeedRandom(), |
| kFailureMonitorMeanMillis, |
| kFailureMonitorStddevMillis)) { |
| } |
| |
| void FailureFunction(const std::string& name, const Status& status) { |
| LOG(INFO) << "Detected failure of " << name; |
| latch_.CountDown(); |
| } |
| |
| protected: |
| void WaitForFailure() { |
| latch_.Wait(); |
| } |
| |
| CountDownLatch latch_; |
| gscoped_ptr<RandomizedFailureMonitor> monitor_; |
| }; |
| |
| // Tests that we can track a node, that while we notify that we're received messages from |
| // that node everything is ok and that once we stop doing so the failure detection function |
| // gets called. |
| TEST_F(FailureDetectorTest, TestDetectsFailure) { |
| ASSERT_OK(monitor_->Start()); |
| |
| scoped_refptr<FailureDetector> detector(new TimedFailureDetector( |
| MonoDelta::FromMilliseconds(kExpectedHeartbeatPeriodMillis * kMaxMissedHeartbeats))); |
| |
| monitor_->MonitorFailureDetector(kTestTabletName, detector); |
| ASSERT_FALSE(detector->IsTracking(kNodeName)); |
| ASSERT_OK(detector->Track(kNodeName, |
| MonoTime::Now(MonoTime::FINE), |
| Bind(&FailureDetectorTest::FailureFunction, Unretained(this)))); |
| ASSERT_TRUE(detector->IsTracking(kNodeName)); |
| |
| const int kNumPeriodsToWait = 4; // Num heartbeat periods to wait for a failure. |
| const int kUpdatesPerPeriod = 10; // Num updates we give per period to minimize test flakiness. |
| |
| for (int i = 0; i < kNumPeriodsToWait * kUpdatesPerPeriod; i++) { |
| // Report in (heartbeat) to the detector. |
| ASSERT_OK(detector->MessageFrom(kNodeName, MonoTime::Now(MonoTime::FINE))); |
| |
| // We sleep for a fraction of heartbeat period, to minimize test flakiness. |
| SleepFor(MonoDelta::FromMilliseconds(kExpectedHeartbeatPeriodMillis / kUpdatesPerPeriod)); |
| |
| // The latch shouldn't have counted down, since the node's been reporting that |
| // it's still alive. |
| ASSERT_EQ(1, latch_.count()); |
| } |
| |
| // If we stop reporting he node is alive the failure callback is eventually |
| // triggered and we exit. |
| WaitForFailure(); |
| |
| ASSERT_OK(detector->UnTrack(kNodeName)); |
| ASSERT_FALSE(detector->IsTracking(kNodeName)); |
| |
| ASSERT_OK(monitor_->UnmonitorFailureDetector(kTestTabletName)); |
| monitor_->Shutdown(); |
| } |
| |
| } // namespace kudu |