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https://issues.apache.org/jira/browse/HDFS-14513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16854639#comment-16854639
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He Xiaoqiao commented on HDFS-14513:
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[~elgoiri], Thanks for your suggestion.
[^HDFS-14513.004.patch] update to shows full stack trace and add some
necessary log.
For the unit test, I try to add another low priority shutdown hook to check the
result, however, assert.fail actually run but not trigger test fail before
fixed, something wrong usage?
> 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
> Attachments: HDFS-14513.001.patch, HDFS-14513.002.patch,
> HDFS-14513.003.patch, HDFS-14513.004.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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