HTable.incrementColumnValue does not take negative 'amount'
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Key: HBASE-1347
URL: https://issues.apache.org/jira/browse/HBASE-1347
Project: Hadoop HBase
Issue Type: Improvement
Components: client
Affects Versions: 0.19.1
Environment: Ubuntu 8.10
Reporter: Xinan Wu
Priority: Minor
Fix For: 0.19.2
Apparently HRegion.binaryIncrement() assumes argument 'amount' is always
positive. It would be nice to support decrement operation. In my application, a
counter can go both up and down.
Quick fix is
public byte [] binaryIncrement(byte [] value, long amount) {
return Bytes.toBytes(Bytes.toLong(value) + amount);
}
but it is 2x~3x slower than current implementation for small positive 'amount'
value. I have not yet found a good implementation to support negative 'amount'
argument, AND match the speed of current implementation. Anyway, I just want to
throw this out there and see if anybody is interested in negative 'amount'
support.
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