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From "Michael Busch (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-887) Interruptible segment merges
Date Sat, 02 Jun 2007 22:33:15 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500971
] 

Michael Busch commented on LUCENE-887:
--------------------------------------

> 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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