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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:
------------------------------------
Attachment: appendNoSync5.txt
Addressed Ted Yu's review comments. The code that does
{code}
for (Entry e : pending) {
+ writer.append(e);
+ }
{code}
does not catch exceptions, instead throws an exception to the caller if any of
the edits fail to make it to HDFS. In fact, Hbase regionserver exits if an HDFS
write/sync fails, this is expected behaviour.
> 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, appendNoSync5.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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