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From "Michael McCandless (JIRA)" <>
Subject [jira] Commented: (LUCENE-1703) Add a waitForMerges() method to IndexWriter
Date Mon, 22 Jun 2009 21:17:07 GMT


Michael McCandless commented on LUCENE-1703:

bq. This would indicate that the waitForMerges=true/false variants of different methods should

Ahh good point; and I think the default should be to wait.  OK I plan to commit the current
patch in a day or two.  Thanks Tim!

> Add a waitForMerges() method to IndexWriter
> -------------------------------------------
>                 Key: LUCENE-1703
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 2.4
>            Reporter: Tim Smith
>         Attachments:,
> It would be very useful to have a waitForMerges() method on the IndexWriter.
> Right now, the only way i can see to achieve this is to call IndexWriter.close()
> ideally, there would be a method on the IndexWriter to wait for merges without actually
closing the index.
> This would make it so that background merges (or optimize) can be waited for without
closing the IndexWriter, and then reopening a new IndexWriter
> the close() reopen IndexWriter method can be problematic if the close() fails as the
write lock won't be released
> this could then result in the following sequence:
> * close() - fails
> * force unlock the write lock (per close() documentation)
> * new IndexWriter() (acquires write lock)
> * finalize() on old IndexWriter releases the write lock
> * Index is now not locked, and another IndexWriter pointing to the same directory could
be opened
> If you don't force unlock the write lock, opening a new IndexWriter will fail until garbage
collection calls finalize() the old IndexWriter
> If the waitForMerges() method is available, i would likely never need to close() the
IndexWriter until right before the process being shutdown, so this issue would not occur (worst
case scenario, the waitForMerges() fails)

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