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https://issues.apache.org/jira/browse/LUCENE-2536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12887813#action_12887813
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Mark Harwood commented on LUCENE-2536:
--------------------------------------

Thanks for the rapid response Mike/Shai.

I'll need to patch a couple of production systems using 2.4.0 and 2.9.1 with 
this.
For the record -  with this same change applied, the test passes OK on these 
older versions too.

> Rollback doesn't preserve integrity of original index
> -----------------------------------------------------
>
>                 Key: LUCENE-2536
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2536
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 3.0.2
>         Environment: Windows XP pro
>            Reporter: Mark Harwood
>            Assignee: Michael McCandless
>         Attachments: LUCENE-2536.patch, LUCENE-2536.patch, TestRollback.java, 
> TestRollback.java
>
>
> After several "updateDocuments" calls a rollback call does not return the 
> index to the prior state.
> This seems to occur if the number of updates exceeds the RAM buffer size i.e. 
> when some flushing of updates occurs.
> Test fails in Lucene 2.4, 2.9, 3.0.1 and 3.0.2
> JUnit to follow.

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