[jira] Commented: (LUCENE-887) Interruptible segment merges

["Michael Busch (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12535357 ] 

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

I think we can close this issue because we have a concurrent MergeScheduler now and a close() method that can abort running merges:

{code:java}
  /**
   * Closes the index with or without waiting for currently
   * running merges to finish.  This is only meaningful when
   * using a MergeScheduler that runs merges in background
   * threads.
   * @param waitForMerges if true, this call will block
   * until all merges complete; else, it will abort all
   * running merges and return right away
   */
  public void close(boolean waitForMerges) throws CorruptIndexException, IOException;
{code}

The only restriction is that an application that wants to be able to stop merges immediately has to use a concurrent MergeScheduler, but I think this is acceptable?

> 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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