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https://issues.apache.org/jira/browse/HDFS-6591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14046877#comment-14046877
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Chris Nauroth commented on HDFS-6591:
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bq. ...the final result should be same due to that two threads have read out a
same source result.
I'd think the same thing too, but then there is a question of whether or not
the buffer copy would be atomic or if it could somehow put the buffer into an
inconsistent state temporarily.
Anyway, that was just my initial theory. Maybe you'll find a different root
cause when you take a look. :-)
> while loop is executed tens of thousands of times in Hedged Read
> ------------------------------------------------------------------
>
> Key: HDFS-6591
> URL: https://issues.apache.org/jira/browse/HDFS-6591
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.4.0
> Reporter: LiuLei
> Assignee: Liang Xie
> Attachments: HDFS-6591-v2.txt, HDFS-6591-v3.txt, HDFS-6591.txt,
> LoopTooManyTimesTestCase.patch
>
>
> I download hadoop-2.4.1-rc1 code from
> http://people.apache.org/~acmurthy/hadoop-2.4.1-rc1/, I test the Hedged
> Read. I find the while loop in hedgedFetchBlockByteRange method is executed
> tens of thousands of times.
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