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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (LUCENE-1149) add XA transaction support
Date Mon, 16 May 2011 12:40:47 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless reopened LUCENE-1149:
----------------------------------------



Sorry, you're right this issue isn't really a dup (I've reopened it).

I was just saying that Lucene's IW APIs are already transactional so
one should be able to build a transactions layer on top.  Ie, you
should not have to make a new index for each transaction.

We would still need a layer that mates this up to the XA transactions
API (I think?).  Does anyone have a patch for this?


> add XA transaction support
> --------------------------
>
>                 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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