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https://issues.apache.org/jira/browse/LUCENE-887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500971
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Michael Busch commented on LUCENE-887:
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> I'm also nervous that such a broad change expands the API of Directory
> to achieve a fairly specific functionality in IndexWriter (stop a
> merge).
I agree. Adding public methods to Directory with javadocs saying
"Please don't call me!" is probably not very desirable.
> Also, looking forward to LUCENE-843, I *think* we will need a
> different approach anyways (I think one that specifically targets the
> merging, at a higher level). Because with LUCENE-843, IndexWriter
> directly streams stored fields & vectors to disk and so you'd have to
> be extremely careful not to interrupt that IO (vs the IO being done
> for merging).
OK I understand. Right, this approach would interrupt those streams as
well. I'm not very familiar with your 843 patch yet, hopefully after 2.2
is out I'll have some time...
> Interruptible segment merges
> ----------------------------
>
> Key: LUCENE-887
> URL: https://issues.apache.org/jira/browse/LUCENE-887
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Reporter: Michael Busch
> Assignee: Michael Busch
> Priority: Minor
> Attachments: ExtendedIndexWriter.java
>
>
> Adds the ability to IndexWriter to interrupt an ongoing merge. This might be
> necessary when Lucene is e. g. running as a service and has to stop indexing
> within a certain period of time due to a shutdown request.
> A solution would be to add a new method shutdown() to IndexWriter which
> satisfies the following two requirements:
> - if a merge is happening, abort it
> - flush the buffered docs but do not trigger a merge
> See also discussions about this feature on java-dev:
> http://www.gossamer-threads.com/lists/lucene/java-dev/49008
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