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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7887) Support configuring KeyValue Comparator as table
Date Wed, 20 Feb 2013 10:39:13 GMT
chunhui shen created HBASE-7887:
-----------------------------------

             Summary: Support configuring KeyValue Comparator as table
                 Key: HBASE-7887
                 URL: https://issues.apache.org/jira/browse/HBASE-7887
             Project: HBase
          Issue Type: New Feature
          Components: regionserver
    Affects Versions: 0.96.0
            Reporter: chunhui shen
            Assignee: chunhui shen
             Fix For: 0.96.0


Now, KeyValue Comparator is static by code in HRegionInfo
{code}
  public KVComparator getComparator() {
    return isRootRegion()? KeyValue.ROOT_COMPARATOR: isMetaRegion()?
      KeyValue.META_COMPARATOR: KeyValue.COMPARATOR;
  }
{code}

In some user cases, we need a personalized KeyValue Comparator.
e.g. Current ByteArrayComparator couldn't be used to sort number if exists negative number.(Because
the bytes of -1 is bigger than the bytes of any other number)

I think supporting per-table configuration of KeyValue Comparator would be useful.

Welcome comments,
I will make the patch tomorrow.

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