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Posted to dev@lucene.apache.org by "Michael McCandless (JIRA)" <ji...@apache.org> on 2009/06/19 19:56:07 UTC
[jira] Commented: (LUCENE-1703) Add a waitForMerges() method to
IndexWriter
[ https://issues.apache.org/jira/browse/LUCENE-1703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12721903#action_12721903 ]
Michael McCandless commented on LUCENE-1703:
--------------------------------------------
You can use ConcurrentMergeScheduler.sync()?
> Add a waitForMerges() method to IndexWriter
> -------------------------------------------
>
> Key: LUCENE-1703
> URL: https://issues.apache.org/jira/browse/LUCENE-1703
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.4
> Reporter: Tim Smith
>
> 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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