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  1. HBase
  2. HBASE-5386

[usability] Soft limit for eager region splitting of young tables


    • Type: New Feature
    • Status: Resolved
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: Usability
    • Labels:


      Coming out of HBASE-2375, we need a new functionality much like hypertable's where we would have a lower split size for new tables and it would grow up to a certain hard limit. This helps usability in different ways:

      • With that we can set the default split size much higher and users will still have good data distribution
      • No more messing with force splits
      • Not mandatory to pre-split your table in order to get good out of the box performance

      The way Doug Judd described how it works for them, they start with a low value and then double it every time it splits. For example if we started with a soft size of 32MB and a hard size of 2GB, it wouldn't be until you have 64 regions that you hit the ceiling.

      On the implementation side, we could add a new qualifier in .META. that has that soft limit. When that field doesn't exist, this feature doesn't kick in. It would be written by the region servers after a split and by the master when the table is created with 1 region.


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              • Assignee:
                jdcryans Jean-Daniel Cryans
              • Votes:
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