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https://issues.apache.org/jira/browse/HDFS-14235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16771576#comment-16771576
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Surendra Singh Lilhore commented on HDFS-14235:
-----------------------------------------------
+1
> Handle ArrayIndexOutOfBoundsException in
> DataNodeDiskMetrics#slowDiskDetectionDaemon
> -------------------------------------------------------------------------------------
>
> Key: HDFS-14235
> URL: https://issues.apache.org/jira/browse/HDFS-14235
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Surendra Singh Lilhore
> Assignee: Ranith Sardar
> Priority: Major
> Attachments: HDFS-14235.000.patch, HDFS-14235.001.patch, NPE.png,
> exception.png
>
>
> below code throwing exception because {{volumeIterator.next()}} called two
> time without checking hashNext().
> {code:java}
> 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());
> }{code}
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