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https://issues.apache.org/jira/browse/HDFS-9906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16632963#comment-16632963
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darkz commented on HDFS-9906:
-----------------------------
you can use
```
hadoop daemonlog -setlevel 192.168.120.180:50070 BlockStateChange ERROR
```
to change the log level online without the namenode restart
> Remove spammy log spew when a datanode is restarted
> ---------------------------------------------------
>
> Key: HDFS-9906
> URL: https://issues.apache.org/jira/browse/HDFS-9906
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.7.2
> Reporter: Elliott Clark
> Assignee: Brahma Reddy Battula
> Priority: Major
> Fix For: 2.8.0, 2.7.3, 3.0.0-alpha1
>
> Attachments: HDFS-9906.patch
>
>
> {code}
> WARN BlockStateChange: BLOCK* addStoredBlock: Redundant addStoredBlock
> request received for blk_1109897077_36157149 on node 192.168.1.1:50010 size
> 268435456
> {code}
> This happens waaaay too much to add any useful information. We should either
> move this to a different level or only warn once per machine.
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