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Posted to hdfs-issues@hadoop.apache.org by "Ranith Sardar (JIRA)" <ji...@apache.org> on 2019/01/28 11:50:00 UTC
[jira] [Commented] (HDFS-14235) Handle
ArrayIndexOutOfBoundsException in
DataNodeDiskMetrics#slowDiskDetectionDaemon
[ https://issues.apache.org/jira/browse/HDFS-14235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16753934#comment-16753934 ]
Ranith Sardar commented on HDFS-14235:
--------------------------------------
Attached the initial patch.
> 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, 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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