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  1. Hadoop Common
  2. HADOOP-13442

Optimize UGI group lookups

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.8.0, 3.0.0-alpha1, 2.7.5
    • Component/s: None
    • Labels:
      None
    • Target Version/s:
    • Hadoop Flags:
      Reviewed

      Description

      UGI#getGroups and its usage is inefficient. The list is unnecessarily converted to multiple collections.

      For every invocation, the List<String> from the group provider is converted into a LinkedHashSet<String> (to de-dup), back to a String[]. Then callers testing for group membership convert back to a List<String>. This should be done once to reduce allocations.

        Attachments

        1. HADOOP-13442.patch
          14 kB
          Daryn Sharp

          Issue Links

          breaks

          Bug - A problem which impairs or prevents the functions of the product. HDFS-10738 Fix TestRefreshUserMappings.testRefreshSuperUserGroupsConfiguration test failure

          • Major - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. MAPREDUCE-6750 TestHSAdminServer.testRefreshSuperUserGroups is failing

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. HADOOP-12253 ViewFileSystem getFileStatus java.lang.ArrayIndexOutOfBoundsException: 0

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. HADOOP-12858 Reduce UGI getGroups overhead

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

          Sub-task - The sub-task of the issue HDFS-10711 Optimize FSPermissionChecker group membership check

          • Major - Major loss of function.
          • Resolved
          relates to

          Improvement - An improvement or enhancement to an existing feature or task. HADOOP-17079 Optimize UGI#getGroups by adding UGI#getGroupsSet

          • Major - Major loss of function.
          • Resolved

            Activity

              People

              • Assignee:
                daryn Daryn Sharp
                Reporter:
                daryn Daryn Sharp
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                Dates

                • Created:
                  Updated:
                  Resolved: