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https://issues.apache.org/jira/browse/HDFS-16000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shilun Fan updated HDFS-16000:
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Target Version/s: 3.4.1 (was: 3.4.0)
> HDFS : Rename performance optimization
> --------------------------------------
>
> Key: HDFS-16000
> URL: https://issues.apache.org/jira/browse/HDFS-16000
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs, namenode
> Affects Versions: 3.1.4, 3.3.1
> Reporter: Xiangyi Zhu
> Assignee: Xiangyi Zhu
> Priority: Major
> Labels: pull-request-available
> Attachments: 20210428-143238.svg, 20210428-171635-lambda.svg,
> HDFS-16000.patch
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> It takes a long time to move a large directory with rename. For example, it
> takes about 40 seconds to move a 1000W directory. When a large amount of data
> is deleted to the trash, the move large directory will occur when the recycle
> bin makes checkpoint. In addition, the user may also actively trigger the
> move large directory operation, which will cause the NameNode to lock too
> long and be killed by Zkfc. Through the flame graph, it is found that the
> main time consuming is to create the EnumCounters object.
>
> h3. Rename logic optimization:
> * Regardless of whether the rename operation is the source directory and the
> target directory, the quota count must be calculated three times. The first
> time, check whether the moved directory exceeds the target directory quota,
> the second time, calculate the mobile directory quota to update the source
> directory quota, and the third time, calculate the mobile directory
> configuration update to the target directory.
> * I think some of the above three quota quota calculations are unnecessary.
> For example, if all parent directories of the source directory and target
> directory are not configured with quota, there is no need to calculate
> quotaCount. Even if both the source directory and the target directory use
> quota, there is no need to calculate the quota three times. The calculation
> logic for the first and third times is the same, and it only needs to be
> calculated once.
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