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https://issues.apache.org/jira/browse/LUCENE-5544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13942805#comment-13942805
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Robert Muir commented on LUCENE-5544:
-------------------------------------
You can definitely call it multiple times, and some tests in fact do just that.
Thats why IOUtils.close() is used, which does nothing on a null parameter.
> exceptions during IW.rollback can leak files and locks
> ------------------------------------------------------
>
> Key: LUCENE-5544
> URL: https://issues.apache.org/jira/browse/LUCENE-5544
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Fix For: 4.8, 5.0, 4.7.1
>
> Attachments: LUCENE-5544.patch
>
>
> Today, rollback() doesn't always succeed: if it does, it closes the writer
> nicely. otherwise, if it hits exception, it leaves you with a half-broken
> writer, still potentially holding file handles and write lock.
> This is especially bad if you use Native locks, because you are kind of
> hosed, the static map prevents you from forcefully unlocking (e.g.
> IndexWriter.unlock) so you have no real course of action to try to recover.
> If rollback() hits exception, it should still deliver the exception, but
> release things (e.g. like IOUtils.close).
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