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HDFS-14235. Handle ArrayIndexOutOfBoundsException in DataNodeDiskMetrics#slowDiskDetectionDaemon. Contributed by Ranith Sardar. 

(cherry picked from commit 41e18feda3)
This commit is contained in:
Surendra Singh Lilhore 2019-02-20 16:56:10 +05:30
parent e6f2b8730f
commit b93b127956
1 changed files with 42 additions and 34 deletions
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76
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/metrics/DataNodeDiskMetrics.java
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@ -57,6 +57,10 @@ public class DataNodeDiskMetrics {
private volatile Map<String, Map<DiskOp, Double>>
diskOutliersStats = Maps.newHashMap();
// Adding for test purpose. When addSlowDiskForTesting() called from test
// code, status should not be overridden by daemon thread.
private boolean overrideStatus = true;
public DataNodeDiskMetrics(DataNode dn, long diskOutlierDetectionIntervalMs) {
this.dn = dn;
this.detectionInterval = diskOutlierDetectionIntervalMs;
@ -71,41 +75,43 @@ public class DataNodeDiskMetrics {
@Override
public void run() {
while (shouldRun) {
Map<String, Double> metadataOpStats = Maps.newHashMap();
Map<String, Double> readIoStats = Maps.newHashMap();
Map<String, Double> writeIoStats = Maps.newHashMap();
FsDatasetSpi.FsVolumeReferences fsVolumeReferences = null;
try {
fsVolumeReferences = dn.getFSDataset().getFsVolumeReferences();
Iterator<FsVolumeSpi> volumeIterator = fsVolumeReferences
.iterator();
while (volumeIterator.hasNext()) {
FsVolumeSpi volume = volumeIterator.next();
DataNodeVolumeMetrics metrics = volumeIterator.next().getMetrics();
String volumeName = volume.getBaseURI().getPath();
if (dn.getFSDataset() != null) {
Map<String, Double> metadataOpStats = Maps.newHashMap();
Map<String, Double> readIoStats = Maps.newHashMap();
Map<String, Double> writeIoStats = Maps.newHashMap();
FsDatasetSpi.FsVolumeReferences fsVolumeReferences = null;
try {
fsVolumeReferences = dn.getFSDataset().getFsVolumeReferences();
Iterator<FsVolumeSpi> volumeIterator = fsVolumeReferences
.iterator();
while (volumeIterator.hasNext()) {
FsVolumeSpi volume = volumeIterator.next();
DataNodeVolumeMetrics metrics = volume.getMetrics();
String volumeName = volume.getBaseURI().getPath();
metadataOpStats.put(volumeName,
metrics.getMetadataOperationMean());
readIoStats.put(volumeName, metrics.getReadIoMean());
writeIoStats.put(volumeName, metrics.getWriteIoMean());
}
} finally {
if (fsVolumeReferences != null) {
try {
fsVolumeReferences.close();
} catch (IOException e) {
LOG.error("Error in releasing FS Volume references", e);
metadataOpStats.put(volumeName,
metrics.getMetadataOperationMean());
readIoStats.put(volumeName, metrics.getReadIoMean());
writeIoStats.put(volumeName, metrics.getWriteIoMean());
}
} finally {
if (fsVolumeReferences != null) {
try {
fsVolumeReferences.close();
} catch (IOException e) {
LOG.error("Error in releasing FS Volume references", e);
}
}
}
}
if (metadataOpStats.isEmpty() && readIoStats.isEmpty() &&
writeIoStats.isEmpty()) {
LOG.debug("No disk stats available for detecting outliers.");
return;
}
if (metadataOpStats.isEmpty() && readIoStats.isEmpty()
&& writeIoStats.isEmpty()) {
LOG.debug("No disk stats available for detecting outliers.");
continue;
}
detectAndUpdateDiskOutliers(metadataOpStats, readIoStats,
writeIoStats);
detectAndUpdateDiskOutliers(metadataOpStats, readIoStats,
writeIoStats);
}
try {
Thread.sleep(detectionInterval);
@ -143,9 +149,10 @@ public class DataNodeDiskMetrics {
for (Map.Entry<String, Double> entry : writeIoOutliers.entrySet()) {
addDiskStat(diskStats, entry.getKey(), DiskOp.WRITE, entry.getValue());
}
diskOutliersStats = diskStats;
LOG.debug("Updated disk outliers.");
if (overrideStatus) {
diskOutliersStats = diskStats;
LOG.debug("Updated disk outliers.");
}
}
private void addDiskStat(Map<String, Map<DiskOp, Double>> diskStats,
@ -176,6 +183,7 @@ public class DataNodeDiskMetrics {
@VisibleForTesting
public void addSlowDiskForTesting(String slowDiskPath,
Map<DiskOp, Double> latencies) {
overrideStatus = false;
if (latencies == null) {
diskOutliersStats.put(slowDiskPath, ImmutableMap.of());
} else {