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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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