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From "John Leach (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14540) Write Ahead Log Batching Optimization
Date Fri, 02 Oct 2015 16:30:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14941346#comment-14941346
] 

John Leach commented on HBASE-14540:
------------------------------------

Clearly, I think we should make it configurable.  The problem with the "smart batching" we
have is that it is designed for in-memory processing vs. a distributed WAL.  

I appreciate you thinking on this...

> 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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