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HDFS-15155. writeIoRate of DataNodeVolumeMetrics is never used. Contributed by Haibin Huang.

This commit is contained in:
Ayush Saxena 2020-03-13 21:10:03 +05:30
parent 25497799cb
commit fb1d7635ae
2 changed files with 58 additions and 3 deletions
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6
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/DataNodeVolumeMetrics.java
View File

@ -151,15 +151,15 @@ public class DataNodeVolumeMetrics {
// Based on writeIoRate
public long getWriteIoSampleCount() {
return syncIoRate.lastStat().numSamples();
return writeIoRate.lastStat().numSamples();
}
public double getWriteIoMean() {
return syncIoRate.lastStat().mean();
return writeIoRate.lastStat().mean();
}
public double getWriteIoStdDev() {
return syncIoRate.lastStat().stddev();
return writeIoRate.lastStat().stddev();
}
public long getTotalFileIoErrors() {

55
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeVolumeMetrics.java
View File

@ -19,6 +19,8 @@ package org.apache.hadoop.hdfs.server.datanode;
import static org.apache.hadoop.test.MetricsAsserts.assertCounter;
import static org.apache.hadoop.test.MetricsAsserts.getMetrics;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;
import java.io.File;
@ -177,4 +179,57 @@ public class TestDataNodeVolumeMetrics {
LOG.info("fileIoErrorMean : " + metrics.getFileIoErrorMean());
LOG.info("fileIoErrorStdDev : " + metrics.getFileIoErrorStdDev());
}
@Test
public void testWriteIoVolumeMetrics() throws IOException {
Configuration conf = new HdfsConfiguration();
conf.setInt(
DFSConfigKeys.DFS_DATANODE_FILEIO_PROFILING_SAMPLING_PERCENTAGE_KEY,
100);
MiniDFSCluster cluster =
new MiniDFSCluster.Builder(conf)
.numDataNodes(NUM_DATANODES)
.storageTypes(
new StorageType[]{StorageType.RAM_DISK, StorageType.DISK})
.storagesPerDatanode(2).build();
try {
FileSystem fs = cluster.getFileSystem();
final Path fileName = new Path("/test.dat");
final long fileLen = Integer.MAX_VALUE + 1L;
long lastWriteIoSampleCount;
DFSTestUtil.createFile(fs, fileName, false, BLOCK_SIZE, fileLen,
fs.getDefaultBlockSize(fileName), REPL, 1L, true);
List<DataNode> datanodes = cluster.getDataNodes();
DataNode datanode = datanodes.get(0);
final ExtendedBlock block = DFSTestUtil.getFirstBlock(fs, fileName);
final FsVolumeSpi volume = datanode.getFSDataset().getVolume(block);
DataNodeVolumeMetrics metrics = volume.getMetrics();
assertEquals(0, metrics.getSyncIoSampleCount());
assertNotEquals(0, metrics.getWriteIoSampleCount());
assertTrue(metrics.getFlushIoSampleCount() > metrics
.getSyncIoSampleCount());
assertTrue(metrics.getWriteIoSampleCount() > metrics
.getFlushIoSampleCount());
lastWriteIoSampleCount = metrics.getWriteIoSampleCount();
try (FSDataOutputStream out = fs.append(fileName)) {
out.writeBytes("hello world");
out.hflush();
}
assertEquals(0, metrics.getSyncIoSampleCount());
assertTrue(metrics.getWriteIoSampleCount() > lastWriteIoSampleCount);
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
}