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https://issues.apache.org/jira/browse/HDFS-15887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17317645#comment-17317645
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Wei-Chiu Chuang commented on HDFS-15887:
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Not an expert here, but makes sense to me.
> Make LogRoll and TailEdits execute in parallel
> ----------------------------------------------
>
> Key: HDFS-15887
> URL: https://issues.apache.org/jira/browse/HDFS-15887
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: JiangHua Zhu
> Assignee: JiangHua Zhu
> Priority: Major
> Labels: pull-request-available
> Attachments: edit_files.jpg
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> In the EditLogTailer class, LogRoll and TailEdits are executed in a thread,
> and when a checkpoint occurs, it will compete with TailEdits for lock
> (FSNamesystem#cpLock).
> Usually, it takes a long time to execute checkpoint, which will cause the
> size of the generated edit log file to be relatively large.
> For example, here is an actual effect:
> The StandbyCheckpointer log is triggered as follows : edit_files.jpg
> 2021-03-11 09:18:42,513 [769071096]-INFO [Standby State
> Checkpointer:StandbyCheckpointer$CheckpointerThread@335]-Triggering
> checkpoint because there have been 5142154 txns since the last checkpoint,
> which exceeds the configured threshold 1000000
> When loading an edit log with a large amount of data, the processing time
> will be longer. We should make the edit log size as even as possible, which
> is good for the operation of the system.
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