Details

    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 3.0.0-alpha1
    • Fix Version/s: None
    • Component/s: performance
    • Labels:
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      Description

      In testing a high-write-throughput workload, I see the DN maintain good performance most of the time, except that occasionally one thread will block for a few seconds in finalizeReplica. It does so holding the FSDatasetImpl lock, which causes all other writer threads to block behind it. HDFS-1148 (making it a rw lock) would help here, but a bigger help would be to go do finer-grained locking (eg per block or per-subdir).

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              • Assignee:
                zhangyongxyz Yong Zhang
                Reporter:
                tlipcon Todd Lipcon
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                • Created:
                  Updated: