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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