TwoPhaseCommit interface
------------------------

                 Key: LUCENE-3193
                 URL: https://issues.apache.org/jira/browse/LUCENE-3193
             Project: Lucene - Java
          Issue Type: New Feature
          Components: core/index
            Reporter: Shai Erera
            Assignee: Shai Erera
             Fix For: 3.3, 4.0


I would like to propose a TwoPhaseCommit interface which declares the methods 
necessary to implement a 2-phase commit algorithm:
* prepareCommit()
* commit()
* rollback()

The prepare/commit ones have variants that take a (Map<String,String> 
commitData) following the ones we have in IndexWriter.

In addition, a TwoPhaseCommitTool which implements a 2-phase commit amongst 
several TPCs.

Having IndexWriter implement that interface will allow running the 2-phase 
commit algorithm on multiple IWs or IW + any other object that implements the 
interface.

We should mark the interface @lucene.internal so as to not block ourselves in 
the future. This is pretty advanced stuff anyway.

Will post a patch soon

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