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https://issues.apache.org/jira/browse/HDFS-1729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Foley resolved HDFS-1729.
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Resolution: Invalid
Withdrawn.
> Improve metrics for measuring NN startup costs.
> -----------------------------------------------
>
> Key: HDFS-1729
> URL: https://issues.apache.org/jira/browse/HDFS-1729
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Reporter: Owen O'Malley
> Assignee: Matt Foley
> Fix For: 0.20.203.0
>
>
> Current logging and metrics are insufficient to diagnose latency problems in
> cluster startup. Add:
> 1. better logs in both Datanode and Namenode for Initial Block Report
> processing, to help distinguish between block
> report processing problems and RPC/queuing problems;
> 2. new logs to measure cost of scanning all blocks for over/under/invalid
> replicas, which occurs in Namenode just
> before exiting safe mode;
> 3. new logs to measure cost of processing the under/invalid replica queues
> (created by the above mentioned scan), which
> occurs just after exiting safe mode, and is said to take 100% of CPU.
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