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https://issues.apache.org/jira/browse/HDFS-2964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13213712#comment-13213712
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Steve Loughran commented on HDFS-2964:
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made sure this is highlighted in the wiki entry
http://wiki.apache.org/hadoop/CouldOnlyBeReplicatedTo ; it was there, but is
now in its own bullet point.
Presumably this test cluster only had one or two DNs, as the JT only wants one
location to save its data. Perhaps the NN status should highlight the "no space
left" situation more, it's certainly something you want an alert on in
production.
> No notice in any logs if dfs.datanode.du.reserved is greater than available
> disk space
> --------------------------------------------------------------------------------------
>
> Key: HDFS-2964
> URL: https://issues.apache.org/jira/browse/HDFS-2964
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node, name-node
> Affects Versions: 0.20.2
> Reporter: Robert J Berger
> Priority: Minor
>
> We spent a long time tracking down why a test hdfs cluster seemed to be
> running fine, but would not allow the mapred system to come up complaining
> that "could only be replicated to 0 nodes, instead of 1".
> There were no namenode or datanode errors in any of the logs. hadoop fsck
> said everything was good. At first glance dfsadmin -report looked good. It
> wasn't until I realized that there was 0 Capacity available that we poked
> around and found
> https://groups.google.com/a/cloudera.org/group/scm-users/msg/a4252d6623adbc2d
> which mentioned that the "reserverd space" might be greater than the disk
> space available. And we did find that our dfs.datanode.du.reserved was indeed
> higher than our actual since we were only testing a small cluster.
> It seems that there should be some warning or error in the logs that say that.
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