add XA transaction support
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Key: LUCENE-1149
URL: https://issues.apache.org/jira/browse/LUCENE-1149
Project: Lucene - Java
Issue Type: New Feature
Components: Index
Reporter: robert engels
Need to add XA transaction support to Lucene.
Without XA support, it is difficult to keep disparate resources (e.g. database)
in sync with the Lucene index.
A review of the XA support added to Hibernate might be a good start (although
Hibernate almost always uses a XA capable backing store database).
It would be ideal to have a combined IndexReaderWriter instance, then create a
XAIndexReaderWriter which wraps it.
The implementation might be as simple as a XA log file which lists the XA
transaction id, and the segments XXX number(s), since Lucene already allows you
to rollback to a previous version (??? for sure, or does it only allow you to
abort the current commit).
If operating under a XA transaction, the no explicit commits or rollbacks
should be allowed on the instance.
The index would be committed during XA prepare(), and then if needed rolledback
when requested. The XA commit() would be a no-op.
There is a lot more to this but this should get the ball rolling.
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