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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4080) Add an option to disable block-level state change logging
Date Fri, 19 Oct 2012 01:36:02 GMT
Kihwal Lee created HDFS-4080:
--------------------------------

             Summary: Add an option to disable block-level state change logging
                 Key: HDFS-4080
                 URL: https://issues.apache.org/jira/browse/HDFS-4080
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: name-node
    Affects Versions: 3.0.0, 2.0.3-alpha
            Reporter: Kihwal Lee


Although the block-level logging in namenode is useful for debugging, it can add a significant
overhead to busy hdfs clusters since they are done while the namespace write lock is held.
One example is shown in HDFS-4075. In this example, the write lock was held for 5 minutes
while logging 11 million log messages for 5.5 million block invalidation events. 

It will be useful if we have an option to disable these block-level log messages and keep
other state change messages going.  If others feel that they can turned into DEBUG (with addition
of isDebugEnabled() checks), that may also work too, but there might be people depending on
the messages.

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