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  1. HBase
  2. HBASE-2149

hbase.regionserver.global.memstore.lowerLimit is too low

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.20.3, 0.90.0
    • Component/s: None
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      The default value of hbase.regionserver.global.memstore.lowerLimit of 25% is very wrong and in almost all cases was problematic (I've seen this in at least 3 occurrences). The cost of flushing a memstore is fairly high and when the global size reaches 40% then ALL inserts are blocked. This means that with a heap of 1GB you could be flushing for 10-20 seconds or worse.

      I suggest a default setting of 38% or even 40% so that only a region or two will be flushed (the biggest ones) for maximum availability.

        Attachments

        1. 2149.patch
          0.6 kB
          Michael Stack

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            People

            • Assignee:
              stack Michael Stack
              Reporter:
              jdcryans Jean-Daniel Cryans
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              Dates

              • Created:
                Updated:
                Resolved: