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From "Adam Fuchs (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-729) refactor core to reduce client application dependency version conflicts
Date Tue, 14 Aug 2012 19:43:38 GMT
Adam Fuchs created ACCUMULO-729:
-----------------------------------

             Summary: refactor core to reduce client application dependency version conflicts
                 Key: ACCUMULO-729
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-729
             Project: Accumulo
          Issue Type: Improvement
          Components: client
            Reporter: Adam Fuchs
            Assignee: Billie Rinaldi


Accumulo client applications often include things like thrift servers. If the client application
uses a different version of a library (like libthrift) than the Accumulo client library uses
then baby Jesus cries (and it doesn't work).

Version conflicts have been common among our users for the following libraries:
 * log4j/slf4j
 * thrift
 * zookeeper
 * hadoop

This problem is solvable with a moderate amount of effort. The Accumulo client library should
create a separate classloader to load its dependencies. We can then separate the core code
into interfaces and implementations. For example, the following methods can load the implementations
through reflection, and all of their dependencies can be contained in that ClassLoader:
 * Instance.getConnector(...)
 * Instance.getConfiguration(...)
 * Instance.*
 * Connector.createScanner(...)
 * Connector.createBatchScanner(...)
 * Connector.createBatchWriter(...)
 * Connector.tableOperations(...)
 * Connector.securityOperations(...)
 * Connector.instanceOperations(...)

This exercise would also make the Accumulo client API more explicit, which would improve accessibility
and reduce the false sense of continuity that may be perceived around some of the classes
in core.


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