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https://issues.apache.org/jira/browse/HBASE-4487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated HBASE-4487:
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Attachment: appendNoSync4.txt
The increment operation releases the rowlock before doing the sync to the HLog.
This improves performance of increments on hot rows.
Introuced method HLog.appendNoSync() that returns a txid. The increment method
then release the rowlock and invokes HLog.sync(txid). The HLog.sync(txid)
returns only if all the transactions upto the one identified by that txid has
been successfully sycned to HDFS.
> The increment operation can release the rowlock before sync-ing the Hlog
> ------------------------------------------------------------------------
>
> Key: HBASE-4487
> URL: https://issues.apache.org/jira/browse/HBASE-4487
> Project: HBase
> Issue Type: Improvement
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: appendNoSync4.txt
>
>
> This allows for better throughput when there are hot rows.I have seen this
> change make a single row update improve from 400 increments/sec/server to
> 4000 increments/sec/server.
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