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https://issues.apache.org/jira/browse/HDFS-13791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16607350#comment-16607350
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Erik Krogen commented on HDFS-13791:
------------------------------------

Just posted the relevant portions to HADOOP-15726. I'll hold off attaching a 
rebased patch here until it is merged...

> Limit logging frequency of edit tail related statements
> -------------------------------------------------------
>
>                 Key: HDFS-13791
>                 URL: https://issues.apache.org/jira/browse/HDFS-13791
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs, qjm
>            Reporter: Erik Krogen
>            Assignee: Erik Krogen
>            Priority: Major
>         Attachments: HDFS-13791-HDFS-12943.000.patch, 
> HDFS-13791-HDFS-12943.001.patch, HDFS-13791-HDFS-12943.002.patch, 
> HDFS-13791-HDFS-12943.003.patch
>
>
> There are a number of log statements that occur every time new edits are 
> tailed by a Standby NameNode. When edits are tailing only on the order of 
> every tens of seconds, this is fine. With the work in HDFS-13150, however, 
> edits may be tailed every few milliseconds, which can flood the logs with 
> tailing-related statements. We should throttle it to limit it to printing at 
> most, say, once per 5 seconds.
> We can implement logic similar to that used in HDFS-10713. This may be 
> slightly more tricky since the log statements are distributed across a few 
> classes.



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