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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3193) TwoPhaseCommit interface
Date Sun, 12 Jun 2011 17:09:51 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048374#comment-13048374
] 

Shai Erera commented on LUCENE-3193:
------------------------------------

{quote}
But: perhaps a different exception should be thrown if there is a problem in the commit()
loop vs the prepareCommit() loop? This way caller can differentiate this case?
{quote}

Good idea. So instead of throwing IOE, we'll throw (Prepare)CommitFailException which takes
a Throwable 'cause' and TPC 'obj'. We can make the two sub-class IOE for convenience (in case
someone does not want to differentiate the two, it's easier to handle both cases in one catch
block).

I'll add these and upload a new patch by tomorrow.

> 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
>
>         Attachments: LUCENE-3193.patch
>
>
> 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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