hadoop-hdfs-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1729) Improve metrics for measuring NN startup costs.
Date Mon, 07 Mar 2011 21:49:00 GMT
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: 0.20.100


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.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message