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  1. Hive
  2. HIVE-3958

support partial scan for analyze command - RCFile

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.11.0
    • Component/s: None
    • Labels:
    • Hadoop Flags:
      Reviewed

      Description

      analyze commands allows us to collect statistics on existing tables/partitions. It works great but might be slow since it scans all files.

      There are 2 ways to speed it up:
      1. collect stats without file scan. It may not collect all stats but good and fast enough for use case. HIVE-3917 addresses it
      2. collect stats via partial file scan. It doesn't scan all content of files but part of it to get file metadata. some examples are https://cwiki.apache.org/Hive/rcfilecat.html for RCFile, ORC ( HIVE-3874 ) and HFile of Hbase (Edit: That link should be https://cwiki.apache.org/confluence/display/Hive/RCFileCat.)

      This jira is targeted to address the #2. More specifically RCFile format.

        Attachments

        1. HIVE-3958.patch.1
          65 kB
          Gang Tim Liu
        2. HIVE-3958.patch.2
          64 kB
          Gang Tim Liu
        3. HIVE-3958.patch.3
          67 kB
          Gang Tim Liu
        4. HIVE-3958.patch.4
          76 kB
          Gang Tim Liu
        5. HIVE-3958.patch.5
          75 kB
          Gang Tim Liu
        6. HIVE-3958.patch.6
          75 kB
          Gang Tim Liu

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              • Assignee:
                gangtimliu Gang Tim Liu
                Reporter:
                gangtimliu Gang Tim Liu
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                Dates

                • Created:
                  Updated:
                  Resolved: