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https://issues.apache.org/jira/browse/HDFS-7503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14247285#comment-14247285
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Arpit Agarwal commented on HDFS-7503:
-------------------------------------
Hi Suresh, that may cause the output from multiple threads to get interleaved
since we're not synchronized any more and make it difficult to parse.
> Namenode restart after large deletions can cause slow processReport (due to
> logging)
> ------------------------------------------------------------------------------------
>
> Key: HDFS-7503
> URL: https://issues.apache.org/jira/browse/HDFS-7503
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 1.2.1, 2.6.0
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Fix For: 1.3.0, 2.6.1
>
> Attachments: HDFS-7503.branch-1.02.patch, HDFS-7503.branch-1.patch,
> HDFS-7503.trunk.01.patch, HDFS-7503.trunk.02.patch
>
>
> If a large directory is deleted and namenode is immediately restarted, there
> are a lot of blocks that do not belong to any file. This results in a log:
> {code}
> 2014-11-08 03:11:45,584 INFO BlockStateChange
> (BlockManager.java:processReport(1901)) - BLOCK* processReport:
> blk_1074250282_509532 on 172.31.44.17:1019 size 6 does not belong to any file.
> {code}
> This log is printed within FSNamsystem lock. This can cause namenode to take
> long time in coming out of safemode.
> One solution is to downgrade the logging level.
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