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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4080) Add an option to disable block-level state change logging
Date Thu, 08 Nov 2012 18:08:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13493351#comment-13493351
] 

Suresh Srinivas commented on HDFS-4080:
---------------------------------------

We should add logger config as a part of this jira. That way a single jira tracks the related
changes.

As regards to "org.apache.hadoop.hdfs.StateChange.block" I am okay keeping the name longer.
Though the named logger (not based on class) can have any name, the name you have used is
similar to a class name. Consider changing the name to ""org.apache.hadoop.hdfs.StateChange.Block"
(block->Block).
                
> 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
>            Assignee: Kihwal Lee
>         Attachments: hdfs-4080.1.patch, hdfs-4080.patch, hdfs-4080.patch
>
>
> 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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