| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.server.datanode; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.DFSConfigKeys; |
| import org.apache.hadoop.hdfs.server.common.Util; |
| import org.apache.hadoop.hdfs.server.datanode.fsdataset.DataNodeVolumeMetrics; |
| import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsVolumeSpi; |
| import org.apache.hadoop.util.Time; |
| |
| import javax.annotation.Nullable; |
| import java.util.concurrent.ThreadLocalRandom; |
| |
| /** |
| * Profiles the performance of the metadata and data related operations on |
| * datanode volumes. |
| */ |
| @InterfaceAudience.Private |
| class ProfilingFileIoEvents { |
| static final Log LOG = LogFactory.getLog(ProfilingFileIoEvents.class); |
| |
| private final boolean isEnabled; |
| private final int sampleRangeMax; |
| |
| public ProfilingFileIoEvents(@Nullable Configuration conf) { |
| if (conf != null) { |
| int fileIOSamplingPercentage = conf.getInt( |
| DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY, |
| DFSConfigKeys |
| .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_DEFAULT); |
| isEnabled = Util.isDiskStatsEnabled(fileIOSamplingPercentage); |
| if (fileIOSamplingPercentage > 100) { |
| LOG.warn(DFSConfigKeys |
| .DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY + |
| " value cannot be more than 100. Setting value to 100"); |
| fileIOSamplingPercentage = 100; |
| } |
| sampleRangeMax = (int) ((double) fileIOSamplingPercentage / 100 * |
| Integer.MAX_VALUE); |
| } else { |
| isEnabled = false; |
| sampleRangeMax = 0; |
| } |
| } |
| |
| public long beforeMetadataOp(@Nullable FsVolumeSpi volume, |
| FileIoProvider.OPERATION op) { |
| if (isEnabled) { |
| DataNodeVolumeMetrics metrics = getVolumeMetrics(volume); |
| if (metrics != null) { |
| return Time.monotonicNow(); |
| } |
| } |
| return 0; |
| } |
| |
| public void afterMetadataOp(@Nullable FsVolumeSpi volume, |
| FileIoProvider.OPERATION op, long begin) { |
| if (isEnabled) { |
| DataNodeVolumeMetrics metrics = getVolumeMetrics(volume); |
| if (metrics != null) { |
| metrics.addMetadastaOperationLatency(Time.monotonicNow() - begin); |
| } |
| } |
| } |
| |
| public long beforeFileIo(@Nullable FsVolumeSpi volume, |
| FileIoProvider.OPERATION op, long len) { |
| if (isEnabled && ThreadLocalRandom.current().nextInt() < sampleRangeMax) { |
| DataNodeVolumeMetrics metrics = getVolumeMetrics(volume); |
| if (metrics != null) { |
| return Time.monotonicNow(); |
| } |
| } |
| return 0; |
| } |
| |
| public void afterFileIo(@Nullable FsVolumeSpi volume, |
| FileIoProvider.OPERATION op, long begin, long len) { |
| if (isEnabled && begin != 0) { |
| DataNodeVolumeMetrics metrics = getVolumeMetrics(volume); |
| if (metrics != null) { |
| long latency = Time.monotonicNow() - begin; |
| metrics.addDataFileIoLatency(latency); |
| switch (op) { |
| case SYNC: |
| metrics.addSyncIoLatency(latency); |
| break; |
| case FLUSH: |
| metrics.addFlushIoLatency(latency); |
| break; |
| case READ: |
| metrics.addReadIoLatency(latency); |
| break; |
| case WRITE: |
| metrics.addWriteIoLatency(latency); |
| break; |
| default: |
| } |
| } |
| } |
| } |
| |
| public void onFailure(@Nullable FsVolumeSpi volume, long begin) { |
| if (isEnabled) { |
| DataNodeVolumeMetrics metrics = getVolumeMetrics(volume); |
| if (metrics != null) { |
| metrics.addFileIoError(Time.monotonicNow() - begin); |
| } |
| } |
| } |
| |
| private DataNodeVolumeMetrics getVolumeMetrics(final FsVolumeSpi volume) { |
| if (isEnabled) { |
| if (volume != null) { |
| return volume.getMetrics(); |
| } |
| } |
| return null; |
| } |
| } |