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https://issues.apache.org/jira/browse/HDFS-16402?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoqiao He resolved HDFS-16402.
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Fix Version/s: 3.4.0
Hadoop Flags: Reviewed
Resolution: Fixed
Committed to trunk. Thanks [~tomscut] for your reports and contributions!
> Improve HeartbeatManager logic to avoid incorrect stats
> -------------------------------------------------------
>
> Key: HDFS-16402
> URL: https://issues.apache.org/jira/browse/HDFS-16402
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: tomscut
> Assignee: tomscut
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Attachments: image-2021-12-29-08-25-44-303.png,
> image-2021-12-29-08-25-54-441.png
>
> Time Spent: 3h
> Remaining Estimate: 0h
>
> After reconfig {*}dfs.datanode.data.dir{*}, we found that the stats of the
> Namenode Web became *negative* and there were many NPE in namenode logs. This
> problem has been solved by HDFS-14042.
> !image-2021-12-29-08-25-54-441.png|width=681,height=293!
> !image-2021-12-29-08-25-44-303.png|width=677,height=180!
> However, if *HeartbeatManager#updateHeartbeat* and
> *HeartbeatManager#updateLifeline* throw other exceptions, stats errors can
> also occur. We should ensure that *stats.subtract()* and *stats.add()* are
> transactional.
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