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https://issues.apache.org/jira/browse/HBASE-5699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13246971#comment-13246971
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Juhani Connolly commented on HBASE-5699:
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Since we have had some similar experience posting it here:
We are finding most of our IPC threads in our region servers locked into
HWal.append(42 out of 50. Of those 20 are in sync, and one is actually
working... As is to be expected).
We made the presumption that the problem was with the WAL synchronisation
mechanisms holding things up and decided to try running multiple RS per node
since we had significant amount of free CPU and memory resources as well as
many barely active hard disks.
By running 3 RS per node, we saw our application specific throughput go from 7k
events to 18k. Each event is made up of roughly 2 writes and 2 increments, plus
some reads/scans which shouldn't be touching the WAL.
This situation is partially also just due to a very high spec per node. I don't
think it would be necessary on more "commodity" type servers, but the option to
use multiple WAL's on each region server may well give some significant
throughput gains for some hardware setups.
> Run with > 1 WAL in HRegionServer
> ---------------------------------
>
> Key: HBASE-5699
> URL: https://issues.apache.org/jira/browse/HBASE-5699
> Project: HBase
> Issue Type: Improvement
> Reporter: binlijin
>
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