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https://issues.apache.org/jira/browse/HADOOP-1139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493229
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Sameer Paranjpye commented on HADOOP-1139:
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The intent here was to make the logging of block events the default. Changing 
the setting in configuration is easy to overlook and if a block error occurs 
then it becomes impossible to diagnose. I would still vote for changing the log 
messages to go out at INFO.


> All block trasitions should be logged at log level INFO
> -------------------------------------------------------
>
>                 Key: HADOOP-1139
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1139
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>            Reporter: dhruba borthakur
>
> The namenode records block trasitions in its log file. It is seen that some 
> of the block transition messages were being logged at debug level. These 
> should be done at INFO level.

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