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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

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 3.0.0-alpha1
    • 2.6.0
    • hdfs-client
    • None

    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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            cmccabe Colin McCabe
            cmccabe Colin McCabe
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