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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3803) BlockPoolSliceScanner new work period notice is very chatty at INFO level
Date Wed, 15 Aug 2012 01:23:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13434724#comment-13434724
] 

Andy Isaacson commented on HDFS-3803:
-------------------------------------

bq. LOG.debug seems reasonable level for it.

I disagree, without the "Starting a new period" message it's very difficult to diagnose the
block pool scanner in production scenarios.  Production cannot run with debug enabled due
to other cases where debug logging is actually expensive.  So making this critical status
message a LOG.debug makes it effectively useless.

I'd be OK with replacing all of these logs with a useful set of (for example) JMX metrics
so that the scanner is more observable in an automatable/graphable fashion, but until that
happens, this message needs to stay in at LOG.info.
                
> BlockPoolSliceScanner new work period notice is very chatty at INFO level
> -------------------------------------------------------------------------
>
>                 Key: HDFS-3803
>                 URL: https://issues.apache.org/jira/browse/HDFS-3803
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 2.1.0-alpha, 2.0.1-alpha
>         Environment: Hadoop 2.0.1-alpha-SNAPSHOT
>            Reporter: Andrew Purtell
>            Priority: Minor
>             Fix For: 2.1.0-alpha, 3.0.0
>
>         Attachments: HDFS-3803.patch
>
>
> One line of ~140 chars logged every 5 seconds. 

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