Improve metrics for measuring NN startup costs.
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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: 0.20.100
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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