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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-4047) TabletBalancer has an implicit requirement for a specific constructor
Date Mon, 02 Nov 2015 16:05:28 GMT
Josh Elser created ACCUMULO-4047:
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             Summary: TabletBalancer has an implicit requirement for a specific constructor
                 Key: ACCUMULO-4047
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4047
             Project: Accumulo
          Issue Type: Improvement
          Components: ter, master
            Reporter: Josh Elser


TabletBalancers are an extension point designed for non-core-Accumulo devs to implement balancers
for a specific purpose.

As noticed in ACCUMULO-3356, there is an unwritten requirement that any concrete implementations
of TabletBalancer have a constructor that takes a String object as an argument. This wouldn't
be so bad but it's a silent failure that falls back to the DefaultBalancer (that's why we
haven't noticed ACCUMULO-3356 for ages).

TabletBalancer already has an init method which could be used. There are lots of other ways
it could be addressed. At a minimum, this should be prominently documented.



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