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https://issues.apache.org/jira/browse/HDFS-14513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16901267#comment-16901267
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Erik Krogen commented on HDFS-14513:
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I backported this to branch-3.2, and used the branch-2 patch from HDFS-14697
for branch-3.1 and branch-3.0 backports. So this should be everywhere trunk ~
branch-2 now.
> FSImage which is saving should be clean while NameNode shutdown
> ---------------------------------------------------------------
>
> Key: HDFS-14513
> URL: https://issues.apache.org/jira/browse/HDFS-14513
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: He Xiaoqiao
> Assignee: He Xiaoqiao
> Priority: Major
> Fix For: 2.10.0, 3.0.4, 3.3.0, 3.2.1, 3.1.3
>
> Attachments: HDFS-14513.001.patch, HDFS-14513.002.patch,
> HDFS-14513.003.patch, HDFS-14513.004.patch, HDFS-14513.005.patch,
> HDFS-14513.006.patch, HDFS-14513.007.patch
>
>
> Checkpointer/FSImageSaver is regular tasks and dump NameNode meta to disk, at
> most per hour by default. If it receive some command (e.g. transition to
> active in HA mode) it will cancel checkpoint and delete tmp files using
> {{FSImage#deleteCancelledCheckpoint}}. However if NameNode shutdown when
> checkpoint, the tmp files will not be cleaned anymore.
> Consider there are 500m inodes+blocks, it could cost 5~10min to finish once
> checkpoint, if we shutdown NameNode during checkpointing, fsimage checkpoint
> file will never be cleaned, after long time, there could be many useless
> checkpoint files. So I propose that we should add hook to clean that when
> shutdown.
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