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https://issues.apache.org/jira/browse/HDFS-14632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16894205#comment-16894205
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Wei-Chiu Chuang commented on HDFS-14632:
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I think this is safe to cherry pick into lower branches. At least, 3.2 and 3.1.
> Reduce useless #getNumLiveDataNodes call in SafeModeMonitor
> -----------------------------------------------------------
>
> Key: HDFS-14632
> URL: https://issues.apache.org/jira/browse/HDFS-14632
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.9.0
> Reporter: He Xiaoqiao
> Assignee: He Xiaoqiao
> Priority: Major
> Fix For: 2.10.0, 3.3.0
>
> Attachments: HDFS-14632.001.patch, HDFS-14632.002.patch,
> HDFS-14632.003.patch, HDFS-14632.004.patch, HDFS-14632.005.patch,
> HDFS-14632.006.patch
>
>
> As mentioned HDFS-14171, SafeModeMonitor invoke useless #getNumLiveDataNodes
> if not config DataNode threshold.
> The root cause is BlockManagerSafeMode#reportStatus(for trunk branch) or
> SafeModeInfo#reportStatus (for branch-2.8) print status every 20 seconds and
> invoke SafeModeInfo#getTurnOffTip.
> Optimize with checking if config DataNode threshold then decide to if get
> number of live DataNodes.
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