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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1332) When unable to place replicas, BlockPlacementPolicy should log reasons nodes were excluded
Date Wed, 18 May 2011 01:41:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035167#comment-13035167
] 

Hudson commented on HDFS-1332:
------------------------------

Integrated in Hadoop-Hdfs-trunk-Commit #665 (See [https://builds.apache.org/hudson/job/Hadoop-Hdfs-trunk-Commit/665/])
    HDFS-1332.  Include more information in exceptions and debug messages when BlockPlacementPolicy
cannot be satisfied.  Contributed by Ted Yu

szetszwo : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1104649
Files : 
* /hadoop/hdfs/trunk/src/java/org/apache/hadoop/hdfs/server/namenode/BlockPlacementPolicyDefault.java
* /hadoop/hdfs/trunk/src/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* /hadoop/hdfs/trunk/CHANGES.txt


> When unable to place replicas, BlockPlacementPolicy should log reasons nodes were excluded
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1332
>                 URL: https://issues.apache.org/jira/browse/HDFS-1332
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Todd Lipcon
>            Assignee: Ted Yu
>            Priority: Minor
>              Labels: newbie
>             Fix For: 0.23.0
>
>         Attachments: HDFS-1332-concise.patch
>
>
> Whenever the block placement policy determines that a node is not a "good target" it
could add the reason for exclusion to a list, and then when we log "Not able to place enough
replicas" we could say why each node was refused. This would help new users who are having
issues on pseudo-distributed (eg because their data dir is on /tmp and /tmp is full). Right
now it's very difficult to figure out the issue.

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