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https://issues.apache.org/jira/browse/HBASE-1347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12702639#action_12702639
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stack commented on HBASE-1347:
------------------------------
The tolong in the bytes class in trunk should be faster. Perhaps copy it local
and try that?
> HTable.incrementColumnValue does not take negative 'amount'
> -----------------------------------------------------------
>
> 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: atppp
> 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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