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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1332) When unable to place replicas, BlockPlacementPolicy should log reasons nodes were excluded
Date Tue, 17 May 2011 21:25:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035062#comment-13035062
] 

Tsz Wo (Nicholas), SZE commented on HDFS-1332:
----------------------------------------------

Thanks Ted,

- This part looks mysterious.  Since the entire theme of this issue is for support new users,
they may ask "Why it only can be replicated to 0 nodes but there is 1 datanode?"
{noformat}
... File /filestatus.dat could only be replicated to 0 nodes, instead of 1, because there
are 1 datanodes running.
{noformat}

- We only have to append the {{failingReason}} to the string builder.  The log should be removed,
otherwise, we will have repeated messages.
{noformat}
+          FSNamesystem.LOG.debug(failingReason);
{noformat}

> 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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