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https://issues.apache.org/jira/browse/HDFS-14783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17069935#comment-17069935
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Íñigo Goiri commented on HDFS-14783:
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Checking before committing, I think this is now a general change to Hadoop
commons and not HDFS.
[~huanghaibin] can you update the JIRA and the description?
> Expired SampleStat needs to be removed from SlowPeersReport
> -----------------------------------------------------------
>
> Key: HDFS-14783
> URL: https://issues.apache.org/jira/browse/HDFS-14783
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Haibin Huang
> Assignee: Haibin Huang
> Priority: Major
> Attachments: HDFS-14783, HDFS-14783-001.patch, HDFS-14783-002.patch,
> HDFS-14783-003.patch, HDFS-14783-004.patch, HDFS-14783-005.patch
>
>
> SlowPeersReport is calculated by the SampleStat between tow dn, so it can
> present on nn's jmx like this:
> {code:java}
> "SlowPeersReport" :[{"SlowNode":"dn2","ReportingNodes":["dn1"]}]
> {code}
> the SampleStat is stored in a LinkedBlockingDeque<SumAndCount>, it won't be
> removed until the queue is full and a newest one is generated. Therefore, if
> dn1 don't send any packet to dn2 for a long time, the old SampleStat will
> keep staying in the queue, and will be used to calculated slowpeer.I think
> these old SampleStats should be considered as expired message and ignore them
> when generating a new SlowPeersReport.
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