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https://issues.apache.org/jira/browse/HDFS-15293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17091947#comment-17091947
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Konstantin Shvachko commented on HDFS-15293:
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We should also incorporate the second condition for checkpointing - the
transactions threshold. If somebody sets checkpoint interval ridiculously
large, but rely solely on teh number of transactions for starting a checkpoint,
the image will be rejected based on the time criteria.
I think the bast way is to refactor the checkpoint decision making into a
{{CheckpointCondition}} class, which would maintain all the parameters and two
main methods {{shouldStartCheckpoint()}} for StandbyNode, and
{{shouldAcceptCheckpoint()}} for Active and Observers.
> Relax FSImage upload time delta check restriction
> -------------------------------------------------
>
> Key: HDFS-15293
> URL: https://issues.apache.org/jira/browse/HDFS-15293
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Chen Liang
> Assignee: Chen Liang
> Priority: Major
> Labels: multi-sbnn
>
> HDFS-12979 introduced the logic that, if ANN sees consecutive fs image upload
> from Standby with a small delta comparing to previous fsImage. ANN would
> reject this image. This is to avoid overly frequent fsImage in case of when
> there are multiple Standby node. However this check could be too stringent.
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