Hadoop HDFS
  1. Hadoop HDFS
  2. HDFS-4697

short-circuit reads do not honor readahead settings

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Minor Minor
    • Resolution: Duplicate
    • Affects Version/s: 2.0.3-alpha
    • Fix Version/s: 2.3.0
    • Component/s: hdfs-client
    • Labels:
      None

      Description

      Neither the new nor the legacy short-circuit read implementations honor dfs.datanode.readahead.bytes. This can result in scenarios where non-short-circuit reads are faster for long reads, simply because they are doing more readahead, and SCR is not. We should do readahead in both cases if it is configured.

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            People

            • Assignee:
              Colin Patrick McCabe
              Reporter:
              Colin Patrick McCabe
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              Dates

              • Created:
                Updated:
                Resolved:

                Development