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https://issues.apache.org/jira/browse/LUCENE-2856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Rutherglen updated LUCENE-2856:
-------------------------------------

    Attachment: LUCENE-2856.patch

Here's a first cut including workarounds to avoid NPEs and file not found 
exceptions in SegmentInfo (when calling size in bytes).  There's a test case 
for merge init, start, and complete.  I need to add one for abort.

> Create IndexWriter event listener, specifically for merges
> ----------------------------------------------------------
>
>                 Key: LUCENE-2856
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2856
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>    Affects Versions: 4.0
>            Reporter: Jason Rutherglen
>         Attachments: LUCENE-2856.patch, LUCENE-2856.patch
>
>
> The issue will allow users to monitor merges occurring within IndexWriter 
> using a callback notifier event listener.  This can be used by external 
> applications such as Solr to monitor large segment merges.

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