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https://issues.apache.org/jira/browse/HDFS-7123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14144253#comment-14144253
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Ming Ma commented on HDFS-7123:
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Alternative approach is to release the lock between PB fsimage checkpoint and
legacy fsimage checkpoint so that edit log replay can catch up. The two formats
will have different contents; but that might be acceptable for certain
scenarios. We can make it configurable w.r.t. whether to release lock between
PB fsimage checkpoint and legacy fsimage checkpoint.
> 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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