[HBASE-7337] SingleColumnValueFilter seems to get unavailble data

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.94.3, 0.95.2
• Component/s: Filters

Environment

0.94

• Assignee: Unassigned
• Reporter: Zhou wenjian
• Created: 12/Dec/12 07:29
• Updated: 15/Jun/22 20:51
• Resolved: 26/Feb/13 04:28

Description

put multi versions of a row.
r1 cf:q version:1 value:1
r1 cf:q version:2 value:3
r1 cf:q version:3 value:2
the filter in scan is set as below:
SingleColumnValueFilter valueF = new SingleColumnValueFilter(
family,qualifier,CompareOp.EQUAL,new BinaryComparator(Bytes
.toBytes("2")));

then i found all of the three versions will be emmitted, then i set latestVersionOnly to false, the result does no change.

  public ReturnCode filterKeyValue(KeyValue keyValue) {
    // System.out.println("REMOVE KEY=" + keyValue.toString() + ", value=" + Bytes.toString(keyValue.getValue()));
    if (this.matchedColumn) {
      // We already found and matched the single column, all keys now pass
      return ReturnCode.INCLUDE;
    } else if (this.latestVersionOnly && this.foundColumn) {
      // We found but did not match the single column, skip to next row
      return ReturnCode.NEXT_ROW;
    }
    if (!keyValue.matchingColumn(this.columnFamily, this.columnQualifier)) {
      return ReturnCode.INCLUDE;
    }
    foundColumn = true;
    if (filterColumnValue(keyValue.getBuffer(),
        keyValue.getValueOffset(), keyValue.getValueLength())) {
      return this.latestVersionOnly? ReturnCode.NEXT_ROW: ReturnCode.INCLUDE;
    }
    this.matchedColumn = true;
    return ReturnCode.INCLUDE;
  }

From the code above, it seeems that version 3 will be first emmited, and set matchedColumn to true, which leads the following version 2 and 1 emmited too.