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https://issues.apache.org/jira/browse/HDFS-13189?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chao Sun resolved HDFS-13189.
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Resolution: Duplicate
> Standby NameNode should roll active edit log when checkpointing
> ---------------------------------------------------------------
>
> Key: HDFS-13189
> URL: https://issues.apache.org/jira/browse/HDFS-13189
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Chao Sun
> Priority: Minor
>
> When the SBN is doing checkpointing, it will hold the {{cpLock}}. In the
> current implementation of edit log tailer thread, it will first check and
> roll active edit log, and then tail and apply edits. In the case of
> checkpointing, it will be blocked on the {{cpLock}} and will not roll the
> edit log.
> It seems there is no dependency between the edit log roll and tailing edits,
> so a better may be to do these in separate threads. This will be helpful for
> people who uses the observer feature without in-progress edit log tailing.
> An alternative is to configure
> {{dfs.namenode.edit.log.autoroll.multiplier.threshold}} and
> {{dfs.namenode.edit.log.autoroll.check.interval.ms}} to let ANN roll its own
> log more frequently in case SBN is stuck on the lock.
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