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https://issues.apache.org/jira/browse/LUCENE-887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500933
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Michael McCandless commented on LUCENE-887:
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I too am nervous about making this as a public API change to
Directory.
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).
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).
> 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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