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hdfs balncer logs or metrics

We use CDH4.2 in our hadoop production cluster, and we are running "hdfs balancer" on a daily basis via crontab.
My question is if there is a balancer log (or metrics) located somewhere, or any configuration i need to add to have such, i need to collect metrics regarding time taken, and summary of blocks moved.

The "hdfs balancer" command will log to STDERR. You can redirect this to a log file when invoking it, to then feed off of the log data for measuring data movement.

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