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https://issues.apache.org/jira/browse/HDFS-14649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16981439#comment-16981439
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Lisheng Sun commented on HDFS-14649:
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hi [~linyiqun]
{quote}
We need a additional unit test for suspect node detection behavior.
{quote}
TestDeadNodeDetection#testDeadNodeDetectionInMultipleDFSInputStream can verify
suspect node detection behavior.
Since only when suspect node failed, suspect thread will add deadnode to
DeadNodeDetector#deads.
if deadnode size is greater than zero, it means supect detection effect.
> Add suspect probe for DeadNodeDetector
> --------------------------------------
>
> Key: HDFS-14649
> URL: https://issues.apache.org/jira/browse/HDFS-14649
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Lisheng Sun
> Assignee: Lisheng Sun
> Priority: Major
> Attachments: HDFS-14649.001.patch, HDFS-14649.002.patch
>
>
> Add suspect probe for DeadNodeDetector.
> when some DataNode of the block is found to inaccessible, put the DataNode
> into it will be placed in the Suspicious Node list. Because when DataNode is
> not accessible, it is likely that the replica has been removed from the
> DataNode.Therefore, it needs to be confirmed by re-probing and requires a
> higher priority processing.
> And when DataNode is placed in the Suspicious Node list, it is accessed by
> other dfsinputstream.
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