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https://issues.apache.org/jira/browse/HBASE-14540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14941155#comment-14941155
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John Leach commented on HBASE-14540:
------------------------------------
I did not run this on HBase based benchmarks but I did run this while we
(SpliceMachine) were running TPCC benchmarks and it showed a significant
improvement (2x).
Also we were able to get rid of these types of error messages.
{NOFORMAT}
wal.FSHLog: Slow sync cost
{NOFORMAT}
> Write Ahead Log Batching Optimization
> -------------------------------------
>
> Key: HBASE-14540
> URL: https://issues.apache.org/jira/browse/HBASE-14540
> Project: HBase
> Issue Type: Improvement
> Reporter: John Leach
> Attachments: HBaseWALBlockingWaitStrategy.java
>
>
> The new write ahead log mechanism seems to batch too few mutations when
> running inside the disruptor. As we scaled our load up (many threads with
> small writes), we saw the number of hdfs sync operations grow in concert with
> the number of writes. Generally, one would expect the size of the batches to
> grow but the number of actual sync operations to settle.
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