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From "Kannan Muthukkaruppan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6981) multiple commit logs per region server
Date Thu, 11 Oct 2012 20:51:06 GMT
Kannan Muthukkaruppan created HBASE-6981:
--------------------------------------------

             Summary: multiple commit logs per region server
                 Key: HBASE-6981
                 URL: https://issues.apache.org/jira/browse/HBASE-6981
             Project: HBase
          Issue Type: New Feature
            Reporter: Kannan Muthukkaruppan
            Assignee: Kannan Muthukkaruppan


For write dominated workloads, the fact that we have only 1 commit log per server  artificially
limits the aggregate throughput to that of one disk (this is especially true if we do true
FS level syncs on each datanode, or even frequent intermittent FS level syncs as data is being
written to each block).

We could consider allowing a configurable number of commit logs per server (perhaps something
close to or slightly less than the number of disks per server), and we could shard regions
on the server, by maybe just a simple modulo scheme, into those commit logs.

[A quick way to experiment with the same might be to run multiple region server instances
per server; but might be better operationally to package the feature into a single region
server.]



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