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https://issues.apache.org/jira/browse/HDFS-2054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13046801#comment-13046801
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Kihwal Lee commented on HDFS-2054:
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Last time I tried what you said with EAGAIN in transferTo() in attempt to avoid
doing epoll() evey time even before sending anything. Some folks were not
thrilled about parsing the text. If it can be done in portable/i14n friendly
way and people do not object the idea itself...
> BlockSender.sendChunk() prints ERROR for connection closures encountered
> during transferToFully()
> --------------------------------------------------------------------------------------------------
>
> Key: HDFS-2054
> URL: https://issues.apache.org/jira/browse/HDFS-2054
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node
> Affects Versions: 0.22.0, 0.23.0
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Priority: Minor
> Attachments: HDFS-2054.patch
>
>
> The addition of ERROR was part of HDFS-1527. In environments where clients
> tear down FSInputStream/connection before reaching the end of stream, this
> error message often pops up. Since these are not really errors and especially
> not the fault of data node, the message should be toned down at least.
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