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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2782) QOS for META table access
Date Thu, 24 Jun 2010 05:02:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882042#action_12882042
] 

Jonathan Gray commented on HBASE-2782:
--------------------------------------

This specialness of META and that ideally it should be distributed is why I'd like to eventually
move it (or a mirror of it) into zk.

> 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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