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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2782) QOS for META table access
Date Thu, 24 Jun 2010 01:37:50 GMT
QOS for META table access

                 Key: HBASE-2782
                 URL: https://issues.apache.org/jira/browse/HBASE-2782
             Project: HBase
          Issue Type: Improvement
          Components: regionserver
            Reporter: Todd Lipcon

I'd like to brainstorm some ideas on how we can prioritize reads and writes to META above
reads and writes to other tables. I've noticed that if the regionserver hosting META is under
heavy load, then lots of other operations take much longer than they should. For example,
I'm currently running 120 threads of YCSB across 3 client nodes hitting a 5-node cluster.
Doing a full scan of META (only 600 rows) takes upwards of 30 seconds in the shell, since
all of the handler threads are tied up and there's a long RPC queue. 

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