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https://issues.apache.org/jira/browse/HDFS-4122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486200#comment-13486200
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Todd Lipcon commented on HDFS-4122:
-----------------------------------

Right, I'm not arguing against doing it. But, we should flag it as 
"incompatible change" so that, upon upgrading, folks will notice the release 
note you've provided. Not all incompatible changes are disallowed IMO, but we 
should be clear when we make one.
                
> Cleanup HDFS logs and reduce the size of logged messages
> --------------------------------------------------------
>
>                 Key: HDFS-4122
>                 URL: https://issues.apache.org/jira/browse/HDFS-4122
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, hdfs client, name-node
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>             Fix For: 1.2.0, 3.0.0
>
>         Attachments: log.chatty.cleanup.branch1.patch, 
> log.chatty.cleanup.branch1.patch, log.chatty.cleanup.branch1.patch, 
> log.chatty.cleanup.trunk.patch, log.chatty.cleanup.trunk.patch, 
> log.chatty.cleanup.trunk.patch
>
>
> I have attached the patch that removes unnecessary information from the log 
> such as "Namesystem." and prefixing file information with "file" and block 
> information with "block" etc.
> On a branch-1 log I saw it reduce the log size by ~10%.

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