| /** |
| * 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. |
| */ |
| package org.apache.hadoop.hdfs.client.impl; |
| |
| import java.util.function.Supplier; |
| import org.apache.hadoop.hdfs.HdfsConfiguration; |
| import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys; |
| import org.apache.hadoop.hdfs.client.impl.metrics.BlockReaderIoProvider; |
| import org.apache.hadoop.hdfs.client.impl.metrics.BlockReaderLocalMetrics; |
| import org.apache.hadoop.metrics2.MetricsRecordBuilder; |
| import org.apache.hadoop.metrics2.lib.MetricsTestHelper; |
| import org.apache.hadoop.metrics2.lib.MutableRollingAverages; |
| import org.apache.hadoop.test.GenericTestUtils; |
| import static org.apache.hadoop.test.MetricsAsserts.getDoubleGauge; |
| import static org.apache.hadoop.test.MetricsAsserts.getMetrics; |
| import org.apache.hadoop.util.FakeTimer; |
| import static org.junit.Assert.assertTrue; |
| import org.junit.Test; |
| import static org.mockito.ArgumentMatchers.any; |
| import static org.mockito.ArgumentMatchers.anyLong; |
| import org.mockito.Mockito; |
| import org.mockito.invocation.InvocationOnMock; |
| import org.mockito.stubbing.Answer; |
| |
| import java.io.IOException; |
| import java.nio.channels.FileChannel; |
| import java.util.Random; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| |
| /** |
| * Tests {@link BlockReaderLocalMetrics}'s statistics. |
| */ |
| public class TestBlockReaderLocalMetrics { |
| private static final long ROLLING_AVERAGES_WINDOW_LENGTH_MS = 1000; |
| private static final int ROLLING_AVERAGE_NUM_WINDOWS = 5; |
| private static final long SLOW_READ_DELAY = 2000; |
| private static final String SHORT_CIRCUIT_READ_METRIC_REGISTERED_NAME = |
| "HdfsShortCircuitReads"; |
| private static final String SHORT_CIRCUIT_LOCAL_READS_METRIC_VALUE_FULL_NAME = |
| "[ShortCircuitLocalReads]RollingAvgLatencyMs"; |
| |
| private static final FakeTimer TIMER = new FakeTimer(); |
| |
| private static HdfsConfiguration conf = new HdfsConfiguration(); |
| private static DfsClientConf clientConf; |
| |
| static { |
| conf = new HdfsConfiguration(); |
| conf.setInt(HdfsClientConfigKeys.Read.ShortCircuit |
| .METRICS_SAMPLING_PERCENTAGE_KEY, 100); |
| clientConf = new DfsClientConf(conf); |
| } |
| |
| @Test(timeout = 300_000) |
| public void testSlowShortCircuitReadsStatsRecorded() throws IOException, |
| InterruptedException, TimeoutException { |
| |
| BlockReaderLocalMetrics metrics = BlockReaderLocalMetrics.create(); |
| MutableRollingAverages shortCircuitReadRollingAverages = metrics |
| .getShortCircuitReadRollingAverages(); |
| MetricsTestHelper.replaceRollingAveragesScheduler( |
| shortCircuitReadRollingAverages, |
| ROLLING_AVERAGE_NUM_WINDOWS, ROLLING_AVERAGES_WINDOW_LENGTH_MS, |
| TimeUnit.MILLISECONDS); |
| |
| FileChannel dataIn = Mockito.mock(FileChannel.class); |
| Mockito.when(dataIn.read(any(), anyLong())).thenAnswer( |
| new Answer<Object>() { |
| @Override |
| public Object answer(InvocationOnMock invocation) throws Throwable { |
| TIMER.advance(SLOW_READ_DELAY); |
| return 0; |
| } |
| }); |
| |
| BlockReaderIoProvider blockReaderIoProvider = new BlockReaderIoProvider( |
| clientConf.getShortCircuitConf(), metrics, TIMER); |
| |
| blockReaderIoProvider.read(dataIn, any(), anyLong()); |
| blockReaderIoProvider.read(dataIn, any(), anyLong()); |
| |
| GenericTestUtils.waitFor(new Supplier<Boolean>() { |
| @Override |
| public Boolean get() { |
| metrics.collectThreadLocalStates(); |
| return shortCircuitReadRollingAverages.getStats(0).size() > 0; |
| } |
| }, 500, 10000); |
| |
| MetricsRecordBuilder rb = getMetrics( |
| SHORT_CIRCUIT_READ_METRIC_REGISTERED_NAME); |
| double averageLatency = getDoubleGauge( |
| SHORT_CIRCUIT_LOCAL_READS_METRIC_VALUE_FULL_NAME, rb); |
| assertTrue("Average Latency of Short Circuit Reads lower than expected", |
| averageLatency >= SLOW_READ_DELAY); |
| } |
| |
| @Test(timeout = 300_000) |
| public void testMutlipleBlockReaderIoProviderStats() throws IOException, |
| InterruptedException, TimeoutException { |
| |
| BlockReaderLocalMetrics metrics = BlockReaderLocalMetrics.create(); |
| MutableRollingAverages shortCircuitReadRollingAverages = metrics |
| .getShortCircuitReadRollingAverages(); |
| MetricsTestHelper.replaceRollingAveragesScheduler( |
| shortCircuitReadRollingAverages, |
| ROLLING_AVERAGE_NUM_WINDOWS, ROLLING_AVERAGES_WINDOW_LENGTH_MS, |
| TimeUnit.MILLISECONDS); |
| |
| FileChannel dataIn1 = Mockito.mock(FileChannel.class); |
| FileChannel dataIn2 = Mockito.mock(FileChannel.class); |
| |
| Mockito.when(dataIn1.read(any(), anyLong())).thenAnswer( |
| new Answer<Object>() { |
| @Override |
| public Object answer(InvocationOnMock invocation) throws Throwable { |
| TIMER.advance(SLOW_READ_DELAY); |
| return 0; |
| } |
| }); |
| |
| Mockito.when(dataIn2.read(any(), anyLong())).thenAnswer( |
| new Answer<Object>() { |
| @Override |
| public Object answer(InvocationOnMock invocation) throws Throwable { |
| TIMER.advance(SLOW_READ_DELAY*3); |
| return 0; |
| } |
| }); |
| |
| BlockReaderIoProvider blockReaderIoProvider1 = new BlockReaderIoProvider( |
| clientConf.getShortCircuitConf(), metrics, TIMER); |
| BlockReaderIoProvider blockReaderIoProvider2 = new BlockReaderIoProvider( |
| clientConf.getShortCircuitConf(), metrics, TIMER); |
| |
| blockReaderIoProvider1.read(dataIn1, any(), anyLong()); |
| blockReaderIoProvider2.read(dataIn2, any(), anyLong()); |
| |
| GenericTestUtils.waitFor(new Supplier<Boolean>() { |
| @Override |
| public Boolean get() { |
| metrics.collectThreadLocalStates(); |
| return shortCircuitReadRollingAverages.getStats(0).size() > 0; |
| } |
| }, 500, 10000); |
| |
| MetricsRecordBuilder rb = getMetrics( |
| SHORT_CIRCUIT_READ_METRIC_REGISTERED_NAME); |
| double averageLatency = getDoubleGauge( |
| SHORT_CIRCUIT_LOCAL_READS_METRIC_VALUE_FULL_NAME, rb); |
| |
| assertTrue("Average Latency of Short Circuit Reads lower than expected", |
| averageLatency >= SLOW_READ_DELAY*2); |
| } |
| |
| @Test(timeout = 300_000) |
| public void testSlowShortCircuitReadsAverageLatencyValue() throws IOException, |
| InterruptedException, TimeoutException { |
| |
| BlockReaderLocalMetrics metrics = BlockReaderLocalMetrics.create(); |
| final MutableRollingAverages shortCircuitReadRollingAverages = metrics |
| .getShortCircuitReadRollingAverages(); |
| MetricsTestHelper.replaceRollingAveragesScheduler( |
| shortCircuitReadRollingAverages, |
| ROLLING_AVERAGE_NUM_WINDOWS, ROLLING_AVERAGES_WINDOW_LENGTH_MS, |
| TimeUnit.MILLISECONDS); |
| |
| Random random = new Random(); |
| FileChannel[] dataIns = new FileChannel[5]; |
| long totalDelay = 0; |
| |
| for (int i = 0; i < 5; i++) { |
| dataIns[i] = Mockito.mock(FileChannel.class); |
| long delay = SLOW_READ_DELAY * random.nextInt(5); |
| Mockito.when(dataIns[i].read(any(), anyLong())) |
| .thenAnswer(new Answer<Object>() { |
| @Override |
| public Object answer(InvocationOnMock invocation) throws Throwable { |
| TIMER.advance(delay); |
| return 0; |
| } |
| }); |
| totalDelay += delay; |
| } |
| long expectedAvgLatency = totalDelay / 5; |
| |
| BlockReaderIoProvider blockReaderIoProvider = new BlockReaderIoProvider( |
| clientConf.getShortCircuitConf(), metrics, TIMER); |
| |
| for (int i = 0; i < 5; i++) { |
| blockReaderIoProvider.read(dataIns[i], any(), anyLong()); |
| } |
| |
| GenericTestUtils.waitFor(new Supplier<Boolean>() { |
| @Override |
| public Boolean get() { |
| metrics.collectThreadLocalStates(); |
| return shortCircuitReadRollingAverages.getStats(0).size() > 0; |
| } |
| }, 500, 10000); |
| |
| MetricsRecordBuilder rb = getMetrics( |
| SHORT_CIRCUIT_READ_METRIC_REGISTERED_NAME); |
| double averageLatency = getDoubleGauge( |
| SHORT_CIRCUIT_LOCAL_READS_METRIC_VALUE_FULL_NAME, rb); |
| |
| assertTrue("Average Latency of Short Circuit Reads lower than expected", |
| averageLatency >= expectedAvgLatency); |
| } |
| } |