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  1. Hadoop HDFS
  2. HDFS-9806 Allow HDFS block replicas to be provided by an external storage system
  3. HDFS-12809

[READ] Fix the randomized selection of locations in {{ProvidedBlocksBuilder}}.

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Details

    • Sub-task
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • 3.1.0
    • None
    • None
    • Reviewed

    Description

      Calling getBlockLocations on files that have a PROVIDED replica, results in the datanode locations being selected at random. Currently, this randomization uses the datanode uuids to pick a node at random (ProvidedDescriptor#choose, ProvidedDescriptor#chooseRandom). Depending on the distribution of the datanode UUIDs, this can lead to large number of iterations (which may not terminate) before a location is chosen. This JIRA aims to replace this with a more efficient randomization strategy.

      Attachments

        1. HDFS-12809-HDFS-9806.001.patch
          6 kB
          Virajith Jalaparti
        2. HDFS-12809-HDFS-9806.002.patch
          10 kB
          Virajith Jalaparti

        Issue Links

          is related to

          Sub-task - The sub-task of the issue HDFS-12778 [READ] Report multiple locations for PROVIDED blocks

          • Major - Major loss of function.
          • Resolved

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              virajith Virajith Jalaparti
              virajith Virajith Jalaparti
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              Dates

                Created:
                Updated:
                Resolved: