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https://issues.apache.org/jira/browse/HBASE-4528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated HBASE-4528:
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Attachment: appendNoSyncPut4.txt
Addressed Gary's concern. The HLog.sync() does not throw an exception if it
encounters a HDFS error. Instead it triggers a logroll as usual.
If the put code encounter an error while syncing to hdfs, then it rollbacks the
change to the memstore and throws an exception to the client.
Kannan: I will rerun my performance benchmark and report results.
> The put operation can release the rowlock before sync-ing the Hlog
> ------------------------------------------------------------------
>
> Key: HBASE-4528
> URL: https://issues.apache.org/jira/browse/HBASE-4528
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Attachments: appendNoSyncPut1.txt, appendNoSyncPut2.txt,
> appendNoSyncPut3.txt, appendNoSyncPut4.txt
>
>
> This allows for better throughput when there are hot rows. A single row
> update improves from 100 puts/sec/server to 5000 puts/sec/server.
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