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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-3083) capability balancing
Date Mon, 25 Aug 2014 22:44:59 GMT
Eric Newton created ACCUMULO-3083:
-------------------------------------

             Summary: capability balancing
                 Key: ACCUMULO-3083
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3083
             Project: Accumulo
          Issue Type: Bug
          Components: master
            Reporter: Eric Newton


I was thinking about balancing, in much the way that new container-based (yarn, mesos, etc)
resource managers work.  The existing {{Balancers}} try to keep the number of tablets even
over presumably homogeneous nodes.

But as clusters age and are improved and expanded in piecemeal, the hardware capabilities
will drift apart.  Some nodes may be capable of handling more load than others.  We may even
want some nodes to have a trivial number of tablets so the data they serve is always cached.

Tablet servers could advertise an attribute (or several).  Really, it would just be a name,
like {{fatnode}} or {{metaonly}}.  These would then be used by the {{Balancer}} to favor or
ignore tservers for balancing.




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