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https://issues.apache.org/jira/browse/HDFS-1806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018665#comment-13018665
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Matt Foley commented on HDFS-1806:
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Well, strictly speaking since it is an intermittent failure, we'll actually
have to wait and see :-)
But yes, I see improvement on the same machine and in the same test
circumstances where pretty consistent intermittent failure was previously
observed:
HDFS-1295 just passed auto-test without a TestBlockReport failure; whereas it
had failed previously, and indeed it has been a long time since I saw
TestBlockReport NOT be on the Hudson failure list for several HDFS bugs I was
interested in.
Altho this is a single instance, I think we've got rational grounds for
believing that we now understand the probable cause and have addressed it.
Regrettably I can't test the failure locally -- it doesn't fail on any machine
I've tried it on here. The proof of the pudding will be seeing if the
community stops being bothered by this false positive after it is submitted to
the public code base.
> TestBlockReport.blockReport_08() and _09() are timing-dependent and likely to
> fail on fast servers
> --------------------------------------------------------------------------------------------------
>
> Key: HDFS-1806
> URL: https://issues.apache.org/jira/browse/HDFS-1806
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node, name-node
> Affects Versions: 0.22.0
> Reporter: Matt Foley
> Attachments: TestBlockReport.java.patch,
> blockReport_08_failure_log.html
>
>
> Method waitForTempReplica() polls every 100ms during block replication,
> attempting to "catch" a datanode in the state of having a TEMPORARY replica.
> But examination of a current Hudson test failure log shows that the replica
> goes from "start" to "TEMPORARY" to "FINALIZED" in only 50ms, so of course
> the poll usually misses it.
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