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https://issues.apache.org/jira/browse/HDFS-1918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032280#comment-13032280
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Todd Lipcon commented on HDFS-1918:
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Hmm, I half agree with your assessment. But, I think this patch will change the
metrics behavior here, no?
Maybe we still need to catch certain classes of exception (socket timeout and
connection reset by peer) and treat them as successful block reads as far as
metrics are concerned? (And probably log at DEBUG level instead of WARN)?
> DataXceiver double logs every IOE out of readBlock
> --------------------------------------------------
>
> Key: HDFS-1918
> URL: https://issues.apache.org/jira/browse/HDFS-1918
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 0.20.2
> Reporter: Jean-Daniel Cryans
> Assignee: Jean-Daniel Cryans
> Priority: Trivial
> Fix For: 0.22.0
>
> Attachments: HDFS-1918.patch
>
>
> DataXceiver will log an IOE twice because opReadBlock() will catch it, log a
> WARN, then throw it again only to be caught in run() as a Throwable and
> logged as an ERROR. As far as I can tell all the information is the same in
> both messages.
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