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From "Michael Busch (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-887) Interruptible segment merges
Date Fri, 01 Jun 2007 18:29:15 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500802
] 

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

> I think we should keep it out of core (ie, as subclasses as you've done
> here) for now? 

We could also add new methods (not abstract) to Directory:
  boolean isInterruptable();
  void interrupt();
  void clearInterrupt();
  
By default isInterruptable() would return false and the other two wouldn't
do anything. Only some Directory implementations should then overwrite these
methods, like FSDirectory.

What I don't like about this is that we would have to make those methods
public, because IndexWriter has to call them. 

> 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
>            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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