Erik Krogen created HDFS-12421:
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             Summary: Balancer to emit standard metrics
                 Key: HDFS-12421
                 URL: https://issues.apache.org/jira/browse/HDFS-12421
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: balancer & mover
            Reporter: Erik Krogen
            Assignee: Erik Krogen
            Priority: Minor


The Balancer currently prints some statistics about its operation to stdout 
while it is running. This is fine if the balancer is manually run via CLI by an 
operator, but for the more common case of it being a scheduled execution, it is 
cumbersome to have to track down the logs to be able to monitor its progress.

We already have a standard metrics system in place; I propose that we have the 
Balancer emit metrics while it is running so that they can be tracked via 
standard metrics infrastructure. We can start with just the things that the 
balancer already prints to stdout: bytes already moved, bytes left to move, 
bytes currently being moved, and iteration number.



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