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https://issues.apache.org/jira/browse/LUCENE-2904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13029408#comment-13029408
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Earwin Burrfoot commented on LUCENE-2904:
-----------------------------------------

Ok, I'm wrong. We need both a list of all SIs and eligible SIs for 
calculations. But that should be handled through API change, not a new public 
method on IW.

> non-contiguous LogMergePolicy should be careful to not select merges already 
> running
> ------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2904
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2904
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 3.2, 4.0
>
>         Attachments: LUCENE-2904.patch
>
>
> Now that LogMP can do non-contiguous merges, the fact that it disregards 
> which segments are already being merged is more problematic since it could 
> result in it returning conflicting merges and thus failing to run multiple 
> merges concurrently.

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