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  1. Hadoop HDFS
  2. HDFS-5182

BlockReaderLocal must allow zero-copy reads only when the DN believes it's valid

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 3.0.0-alpha1
    • Fix Version/s: 2.6.0
    • Component/s: hdfs-client
    • Labels:
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    • Target Version/s:

      Description

      BlockReaderLocal must allow zero-copy reads only when the DN believes it's valid. This implies adding a new field to the response to REQUEST_SHORT_CIRCUIT_FDS. We also need some kind of heartbeat from the client to the DN, so that the DN can inform the client when the mapped region is no longer locked into memory.

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            • Assignee:
              cmccabe Colin McCabe
              Reporter:
              cmccabe Colin McCabe

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                Updated:
                Resolved:

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