Plamen Jeliazkov created HDFS-13020:
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Summary: Add JMX metrics for computeReconstruction and
computeInvalidation work
Key: HDFS-13020
URL: https://issues.apache.org/jira/browse/HDFS-13020
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Reporter: Plamen Jeliazkov
Assignee: Plamen Jeliazkov
Priority: Minor
HDFS configuration allows tweaking of NameNode replication settings. However,
optimal settings may be tricky to determine and usually rely on observation of
key metrics in order to determine.
In one particular instance, I was trying to find the optimal value of
'dfs.namenode.replication.work.multiplier.per.iteration' but was unable to find
any metrics around the ReconstructionMonitor's replication and invalidation
cycles that is mostly affected by changing that property.
If we expose some trivial JMX metrics for how long these cycles take we can
better understand what effects tweaking the work multiplier will have.
Of course, I am also open to suggestions around what else we should track here.
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