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
Priority: Minor

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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postedAug 6, '10 at 6:44p
activeAug 6, '10 at 6:44p

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Todd Lipcon (JIRA): 1 post



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