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  1. Hadoop HDFS
  2. HDFS-8361

Choose SSD over DISK in block placement

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 2.8.0, 2.7.1, 3.0.0-alpha1
    • namenode
    • None
    • Reviewed

    Description

      BlockPlacementPolicyDefault chooses the StorageType by iterating the given StorageType EnumMap in its natural order (the order in which the enum constants are declared). So DISK will be chosen over SSD in One-SSD policy since DISK is declared before SSD as shown below. We should choose SSD first.

      public enum StorageType {
  DISK(false),
  SSD(false),
  ARCHIVE(false),
  RAM_DISK(true);

  ...
}

      Attachments

        1. h8361_20150612.patch
          5 kB
          Tsz-wo Sze
        2. h8361_20150508.patch
          2 kB
          Tsz-wo Sze

        Issue Links

          breaks

          Bug - A problem which impairs or prevents the functions of the product. HADOOP-12095 org.apache.hadoop.fs.shell.TestCount fails

          • Major - Major loss of function.
          • Resolved
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. HDFS-9667 StorageType: SSD precede over DISK

          • Major - Major loss of function.
          • Resolved
          is related to

          Sub-task - The sub-task of the issue HBASE-14061 Support CF-level Storage Policy

          • Major - Major loss of function.
          • Closed

          Activity

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              szetszwo Tsz-wo Sze
              szetszwo Tsz-wo Sze
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              Dates

                Created:
                Updated:
                Resolved: