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  1. Hadoop HDFS
  2. HDFS-1332

When unable to place replicas, BlockPlacementPolicy should log reasons nodes were excluded

    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.23.0
    • Component/s: namenode
    • Labels:
    • Hadoop Flags:
      Reviewed

      Description

      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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              • Assignee:
                yuzhihong@gmail.com Ted Yu
                Reporter:
                tlipcon Todd Lipcon
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                • Created:
                  Updated:
                  Resolved: