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https://issues.apache.org/jira/browse/HDFS-7123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14145065#comment-14145065
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Lohit Vijayarenu commented on HDFS-7123:
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If we drop the lock then users of these images will have to have the knowledge
that both are of them could be out of sync. Parallel checkpoint takes more CPU,
but that that point it is holding big lock where no other CPU intensive task is
going on anyways. Changes look good. +1 on the patch.
> Run legacy fsimage checkpoint in parallel with PB fsimage checkpoint
> --------------------------------------------------------------------
>
> Key: HDFS-7123
> URL: https://issues.apache.org/jira/browse/HDFS-7123
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ming Ma
> Assignee: Ming Ma
> Attachments: HDFS-7123.patch
>
>
> HDFS-7097 will address the checkpoint and BR issue. In addition, it might
> still be useful to reduce the overall checkpoint duration, given it blocks
> edit log replay. If there is large volume of edit log to catch up and NN fail
> overs, it will impact the availability.
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