Hanisha Koneru updated HDFS-10713:
    Attachment: HDFS-10713.009.patch

Thanks Arpit. I have addressed the latest comments in v9 patch.

> Throttle FsNameSystem lock warnings
> -----------------------------------
>                 Key: HDFS-10713
>                 URL: https://issues.apache.org/jira/browse/HDFS-10713
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: logging, namenode
>            Reporter: Arpit Agarwal
>            Assignee: Hanisha Koneru
>         Attachments: HDFS-10713.000.patch, HDFS-10713.001.patch, 
> HDFS-10713.002.patch, HDFS-10713.003.patch, HDFS-10713.004.patch, 
> HDFS-10713.005.patch, HDFS-10713.006.patch, HDFS-10713.007.patch, 
> HDFS-10713.008.patch, HDFS-10713.009.patch
> The NameNode logs a message if the FSNamesystem write lock is held by a 
> thread for over 1 second. These messages can be throttled to at one most one 
> per x minutes to avoid potentially filling up NN logs. We can also log the 
> number of suppressed notices since the last log message.

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