Adam Fuchs created ACCUMULO-729:
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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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