[HDFS-14235] Handle ArrayIndexOutOfBoundsException in DataNodeDiskMetrics#slowDiskDetectionDaemon

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.3.0, 3.2.1, 3.1.4
• Assignee: Ranith Sardar
• Reporter: Surendra Singh Lilhore
• Created: 28/Jan/19 08:58
• Updated: 30/Sep/19 23:54
• Resolved: 20/Feb/19 11:56

Description

below code throwing exception because volumeIterator.next() called two time without checking hashNext().

while (volumeIterator.hasNext()) {
  FsVolumeSpi volume = volumeIterator.next();
  DataNodeVolumeMetrics metrics = volumeIterator.next().getMetrics();
  String volumeName = volume.getBaseURI().getPath();

  metadataOpStats.put(volumeName,
  metrics.getMetadataOperationMean());
  readIoStats.put(volumeName, metrics.getReadIoMean());
  writeIoStats.put(volumeName, metrics.getWriteIoMean());
}

Issue Links

• is broken by: HDFS-11461 DataNode Disk Outlier Detection
• is related to: HDFS-11475 Unit Test for DataNode Disk Outlier Detection