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https://issues.apache.org/jira/browse/HBASE-14540?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-14540:
--------------------------
    Attachment: 14540.txt

Make wait strategy pluggable. Add in Johns' waitFor 2ms as option.

> 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: 14540.txt, 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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