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From "Surendra Singh Lilhore (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9023) When NN is not able to identify DN for replication, reason behind it can be logged
Date Thu, 28 Dec 2017 04:45:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16305054#comment-16305054
] 

Surendra Singh Lilhore commented on HDFS-9023:
----------------------------------------------

Thanks [~xiaochen] for V3 patch.

+1 LGTM..

bq. So kept this as-is in patch 3. Please let me know if you feel otherwise.

Fine, no need to change.



> When NN is not able to identify DN for replication, reason behind it can be logged
> ----------------------------------------------------------------------------------
>
>                 Key: HDFS-9023
>                 URL: https://issues.apache.org/jira/browse/HDFS-9023
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client, namenode
>    Affects Versions: 2.7.1
>            Reporter: Surendra Singh Lilhore
>            Assignee: Xiao Chen
>            Priority: Critical
>         Attachments: HDFS-9023.01.patch, HDFS-9023.02.patch, HDFS-9023.03.patch
>
>
> When NN is not able to identify DN for replication, reason behind it can be logged (at
least critical information why DNs not chosen like disk is full). At present it is expected
to enable debug log.
> For example the reason for below error looks like all 7 DNs are busy for data writes.
But at client or NN side no hint is given in the log message.
> {noformat}
> File /tmp/logs/spark/logs/application_1437051383180_0610/xyz-195_26009.tmp could only
be replicated to 0 nodes instead of minReplication (=1).  There are 7 datanode(s) running
and no node(s) are excluded in this operation.
> 	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1553)

> {noformat}



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