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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12421) Balancer to emit standard metrics
Date Mon, 11 Sep 2017 20:02:00 GMT
Erik Krogen created HDFS-12421:

             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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