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https://issues.apache.org/jira/browse/HDFS-1332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13033368#comment-13033368
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Todd Lipcon commented on HDFS-1332:
-----------------------------------
Just a sample of why this JIRA is important, from #hadoop IRC a minute ago:
{code}
15:23 < user> Hi all. I have a strange problem - I can't seem to run a simple
copyFromLocal command from
my local machine, but everything works fine if i log into
the master as the same user and
issue command
15:25 < user> the error it throws is cryptic - java.io.IOException: File
/foo/bar could only be
replicated to 0 nodes, instead of 1
15:26 < user> i checked the namenode and tasktracker logs - nothing of interest
there (except the error i
mentioned, of course)
{code}
> 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.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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