[HBASE-7887] Support configuring KeyValue Comparator at table level

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 0.95.2
• Component/s: regionserver
• Assignee: Unassigned
• Reporter: Chunhui Shen
• Created: 20/Feb/13 10:39
• Updated: 16/Jun/22 05:31
• Resolved: 21/Feb/13 03:12

Description

Now, KeyValue Comparator is static by code in HRegionInfo

  public KVComparator getComparator() {
    return isRootRegion()? KeyValue.ROOT_COMPARATOR: isMetaRegion()?
      KeyValue.META_COMPARATOR: KeyValue.COMPARATOR;
  }

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.