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https://issues.apache.org/jira/browse/HDFS-2737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177869#comment-13177869
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Todd Lipcon commented on HDFS-2737:
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bq. Is it worth considering supporting tailing non-finalized logs?
Worth considering, but as I understand from Ivan and Jitendra, BK doesn't
support this functionality yet. Since it's simpler to just cause frequent
rolls, we may as well do it this way and also solve the problem for BK at the
same time, IMO.
> HA: Automatically trigger log rolls periodically on the active NN
> -----------------------------------------------------------------
>
> Key: HDFS-2737
> URL: https://issues.apache.org/jira/browse/HDFS-2737
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha, name-node
> Affects Versions: HA branch (HDFS-1623)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
>
> Currently, the edit log tailing process can only read finalized log segments.
> So, if the active NN is not rolling its logs periodically, the SBN will lag a
> lot. This also causes many datanode messages to be queued up in the
> PendingDatanodeMessage structure.
> To combat this, the active NN needs to roll its logs periodically -- perhaps
> based on a time threshold, or perhaps based on a number of transactions. I'm
> not sure yet whether it's better to have the NN roll on its own or to have
> the SBN ask the active NN to roll its logs.
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