Hi I wrote 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. I also wrote TwoPhaseCommitTool which implements a 2-phase commit amongst several TPCs. Both were written with the intention to use them while committing an IndexWriter + objects that use IW internally. Making IW impl it will be convenient. Plus, I think it is a useful interface and perhaps we'll find other uses for it in the future (maybe Solr already has?) I know that interfaces are not very popular here, so I don't mind if we mark it @lucene.internal. What do you think? I can post a patch if you think this is worth having in Lucene. Shai
