HDFS-11477. Simplify file IO profiling configuration. Contributed by Hanisha Koneru.
This commit is contained in:
Arpit Agarwal
parent
51fefbe38b
commit
5e760f8dc4
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@ -323,7 +323,12 @@ Each metrics record contains tags such as SessionId and Hostname as additional i
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FsVolume
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--------
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Per-volume metrics contain Datanode Volume IO related statistics. Per-volume metrics are off by default. They can be enbabled by setting `dfs.datanode.enable.fileio.profiling` to **true**, but enabling per-volume metrics may have a performance impact. Each metrics record contains tags such as Hostname as additional information along with metrics.
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Per-volume metrics contain Datanode Volume IO related statistics. Per-volume
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metrics are off by default. They can be enabled by setting `dfs.datanode
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.fileio.profiling.sampling.fraction` to a fraction between 0.0 and 1.0.
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Setting this value to 0.0 would mean profiling is not enabled. But enabling
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per-volume metrics may have a performance impact. Each metrics record
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contains tags such as Hostname as additional information along with metrics.
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| Name | Description |
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|:---- |:---- |
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@ -664,10 +664,6 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
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public static final int DFS_IMAGE_TRANSFER_CHUNKSIZE_DEFAULT = 64 * 1024;
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// Datanode File IO Stats
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public static final String DFS_DATANODE_ENABLE_FILEIO_PROFILING_KEY =
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"dfs.datanode.enable.fileio.profiling";
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public static final boolean DFS_DATANODE_ENABLE_FILEIO_PROFILING_DEFAULT =
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false;
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public static final String DFS_DATANODE_ENABLE_FILEIO_FAULT_INJECTION_KEY =
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"dfs.datanode.enable.fileio.fault.injection";
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public static final boolean
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@ -676,7 +672,7 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
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DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY =
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"dfs.datanode.fileio.profiling.sampling.fraction";
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public static final double
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DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_DEAFULT = 1.0;
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DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_DEFAULT = 0.0;
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//Keys with no defaults
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public static final String DFS_DATANODE_PLUGINS_KEY = "dfs.datanode.plugins";
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@ -62,7 +62,7 @@ import static org.apache.hadoop.hdfs.server.datanode.FileIoProvider.OPERATION.*;
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*
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* Behavior can be injected into these events by enabling the
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* profiling and/or fault injection event hooks through
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* {@link DFSConfigKeys#DFS_DATANODE_ENABLE_FILEIO_PROFILING_KEY} and
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* {@link DFSConfigKeys#DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY} and
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* {@link DFSConfigKeys#DFS_DATANODE_ENABLE_FILEIO_FAULT_INJECTION_KEY}.
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* These event hooks are disabled by default.
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*
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@ -18,6 +18,7 @@
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package org.apache.hadoop.hdfs.server.datanode;
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import static java.lang.Math.abs;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.classification.InterfaceAudience;
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@ -43,18 +44,32 @@ class ProfilingFileIoEvents {
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public ProfilingFileIoEvents(@Nullable Configuration conf) {
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if (conf != null) {
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isEnabled = conf.getBoolean(DFSConfigKeys
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.DFS_DATANODE_ENABLE_FILEIO_PROFILING_KEY, DFSConfigKeys
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.DFS_DATANODE_ENABLE_FILEIO_PROFILING_DEFAULT);
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double fileIOSamplingFraction = conf.getDouble(DFSConfigKeys
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.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY,
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DFSConfigKeys
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.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_DEAFULT);
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if (fileIOSamplingFraction > 1) {
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.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_DEFAULT);
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if (abs(fileIOSamplingFraction) < 0.000001) {
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LOG.info(DFSConfigKeys
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.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY + " set to "
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+ fileIOSamplingFraction + ". Disabling file IO profiling");
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isEnabled = false;
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} else if (fileIOSamplingFraction < 0.000001) {
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LOG.warn(DFSConfigKeys
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.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY +
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" value cannot be more than 1. Setting value to 1");
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" value cannot be less than 0. Disabling file IO profiling.");
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isEnabled = false;
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} else if (fileIOSamplingFraction > 1) {
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LOG.warn(DFSConfigKeys
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.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY +
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" value cannot be more than 1. Setting value to 1 and enabling " +
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"file IO profiling");
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isEnabled = true;
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fileIOSamplingFraction = 1;
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} else {
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LOG.info(DFSConfigKeys
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.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY + " set to "
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+ fileIOSamplingFraction + ". Enabling file IO profiling");
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isEnabled = true;
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}
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sampleRangeMax = (int) (fileIOSamplingFraction * Integer.MAX_VALUE);
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} else {
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@ -121,8 +121,8 @@ public class TestDataNodeVolumeMetrics {
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private MiniDFSCluster setupClusterForVolumeMetrics() throws IOException {
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Configuration conf = new HdfsConfiguration();
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conf.setBoolean(DFSConfigKeys
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.DFS_DATANODE_ENABLE_FILEIO_PROFILING_KEY, true);
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conf.setDouble(DFSConfigKeys
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.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_FRACTION_KEY, 1.0);
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SimulatedFSDataset.setFactory(conf);
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return new MiniDFSCluster.Builder(conf)
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.numDataNodes(NUM_DATANODES)
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@ -107,8 +107,6 @@ public class TestHdfsConfigFields extends TestConfigurationFieldsBase {
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.add(DFSConfigKeys.DFS_DATANODE_STARTUP_KEY);
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configurationPropsToSkipCompare
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.add(DFSConfigKeys.DFS_NAMENODE_STARTUP_KEY);
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configurationPropsToSkipCompare
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.add(DFSConfigKeys.DFS_DATANODE_ENABLE_FILEIO_PROFILING_KEY);
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configurationPropsToSkipCompare.add(DFSConfigKeys
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.DFS_DATANODE_ENABLE_FILEIO_FAULT_INJECTION_KEY);
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configurationPropsToSkipCompare.add(DFSConfigKeys
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