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  1. HBase
  2. HBASE-10018

Remove region location prefetching

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 0.98.0, 0.96.0
    • 0.99.0
    • None
    • None
    • Reviewed
    • The location prefetch features is removed from the code. The related interfaces are kept for backward compatibility, but do nothing.

    Description

      Issues with prefetching are:

      • we do two calls to meta: one for the exact row, one for the prefetch
      • it's done in a lock
      • we take the next 10 regions. Why 10, why the 10 next?
      • is it useful if the table has 100K regions?

      Options are:

      • just remove it
      • replace it with a reverse scan: this would save a call

      Attachments

        1. 10018v3.patch
          27 kB
          Nicolas Liochon
        2. 10018.v6.patch
          36 kB
          Nicolas Liochon
        3. 10018.v5.patch
          36 kB
          Nicolas Liochon
        4. 10018.v4.patch
          46 kB
          Nicolas Liochon
        5. 10018.v2.patch
          27 kB
          Nicolas Liochon
        6. 10018.v1.patch
          22 kB
          Nicolas Liochon

        Issue Links

          breaks

          Bug - A problem which impairs or prevents the functions of the product. HBASE-19260 Add lock back to avoid parallel accessing meta to locate region

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

          Sub-task - The sub-task of the issue HBASE-10355 Failover RPC's from client using region replicas

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. HBASE-10949 Reversed scan could hang

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          relates to

          Sub-task - The sub-task of the issue HBASE-18569 Add prefetch support for async region locator

          • Major - Major loss of function.
          • Closed
          requires

          Improvement - An improvement or enhancement to an existing feature or task. HBASE-9999 Add support for small reverse scan

          • Major - Major loss of function.
          • Closed

          Activity

            People

              nkeywal Nicolas Liochon
              nkeywal Nicolas Liochon
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              Dates

                Created:
                Updated:
                Resolved: