[jbosscache-issues] [JBoss JIRA] (JBCACHE-1621) Transaction rollback processed before the prepare is ignored

[Dennis Reed (JIRA)]

    [ https://issues.jboss.org/browse/JBCACHE-1621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12710122#comment-12710122 ] 

Dennis Reed commented on JBCACHE-1621:
--------------------------------------

There are 3 use cases:
1. prepare finishes before rollback
2. rollback finishes before prepare
3. rollback runs during prepare/prepare runs during rollback

#1 is the original working use case.
Fixed #2 by keeping track of unmatched rollbacks and aborting the related prepare when it is later processed
Fixed #3 by adding locking to block a rollback while a prepare on the same tranaction is in progress.
   (converting this use case to #1)

Also updated GlobalTransaction to be unique across restarts (so the fix for #2 wouldn't match and ignore the wrong prepare).

                
> Transaction rollback processed before the prepare is ignored
> ------------------------------------------------------------
>
>                 Key: JBCACHE-1621
>                 URL: https://issues.jboss.org/browse/JBCACHE-1621
>             Project: JBoss Cache
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: Transactions
>            Reporter: Dennis Reed
>            Assignee: Dennis Reed
>         Attachments: JBCACHE-1621-test.zip
>
>
> If a transaction rollback is processed before the prepare for that transaction, the rollback is ignored.
> This ordering can happen if the replication timeout is triggered due to other transactions waiting on locks.
> The result is that when the prepare is later processed, it holds onto locks until the transaction times out.

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