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Re: Any plans to support JTA and XA in jgit?

From
Farrukh Najmi <farrukh@wellfleetsoftware.com>
Date
Nov 14, 2008, 14:45 UTC
Message-ID
<491D8F1F.7090803@wellfleetsoftware.com>
In-Reply-To
<f73f7ab80811140638m4045cf83p311c593aff066002@mail.gmail.com>
Kyle Moffett wrote:
Show 13 quoted lines
> On Thu, Nov 13, 2008 at 3:27 PM, Farrukh Najmi
> <farrukh@wellfleetsoftware.com> wrote:
>   
>> The problem I am trying to solve is this. In my service I need to store
>> metadata in a relational db and content in git such that both either commit
>> or not in a single transaction. If one commits and the other does not that
>> is a serious integrity issue. Seems to me, two phase commit would be the
>> right solution for that in the long run. This what JDBC + JMS topologies do.
>>     
>
> That's really easy!  First tweak jgit so that *instead* of using
> .git/refs, it uses your database to store references and exports them
> on a routine basis to .git/refs for debugging purposes.

Wow! This does sound simple in theory. Of course I have much to learn about jgit code base first. Any pointers on what parts of the code are involved that I should start looking at? I would hate to keep a fork of gjit around. Would this work be of interest to the project if it could be done in a way that a few properties control whether to use database or not?

Thanks Kyle!
Show 19 quoted lines
> Then, for
> each database update:
>
> (1)  Start transaction
> (2)  Commit the change to GIT (adds ref update to the transaction)
> (3)  Make other metadata updates
> (4)  Commit transaction
>
> Then set up periodic garbage collection and you're done!  If the
> transaction is aborted, there will simply be a bunch of random loose
> objects in the git repository, which will be cleaned up the next time
> you garbage collect.  The ref update will be atomic and conditional
> with the rest of the transaction, and in git the *only* part that
> really matters for atomicity is the ref.
>
> Cheers,
> Kyle Moffett
>
>   
-- 
Regards,
Farrukh Najmi

Web: http://www.wellfleetsoftware.com
Previous: Kyle MoffettNext: Farrukh Najmi
Message 5 of 8 in “Re: Any plans to support JTA and XA in jgit?”
  1. Robin RosenbergNov 13, 2008
  2. Farrukh NajmiNov 13, 2008
  3. Robin RosenbergNov 13, 2008
  4. Kyle MoffettNov 14, 2008
  5. Farrukh NajmiNov 14, 2008
  6. Any overview available on jgit codebase?Farrukh Najmi, Nov 15, 2008
  7. Shawn O. PearceNov 15, 2008
  8. Farrukh NajmiNov 16, 2008

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