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https://issues.apache.org/jira/browse/HDFS-6529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14031345#comment-14031345
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Aaron T. Myers commented on HDFS-6529:
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Patch looks fine to me. +1 pending Jenkins.
> Debug logging for RemoteBlockReader2 to identify remote datanode and file
> being read
> ------------------------------------------------------------------------------------
>
> Key: HDFS-6529
> URL: https://issues.apache.org/jira/browse/HDFS-6529
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 2.4.0
> Reporter: Anubhav Dhoot
> Assignee: Anubhav Dhoot
> Priority: Minor
> Attachments: HDFS-6529.patch
>
>
> The scenario is some download is stuck and we dont know which data node is
> the client waiting and for which path.
> By turning this file trace logging we will get a running trace of which
> requests have started and which have completed.
> If trace is not enabled, there is no overhead other than checking if trace is
> enabled
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