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https://issues.apache.org/jira/browse/LUCENE-1384?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-1384:
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Attachment: LUCENE-1384.patch
Attached patch. I plan to commit in a day or to to 2.3.x branch.
> addIndexesNoOptimize intermittantly throws incorrect "segment exists in
> external directory..." exception
> --------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-1384
> URL: https://issues.apache.org/jira/browse/LUCENE-1384
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.3, 2.3.1, 2.3.2
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.3.3
>
> Attachments: LUCENE-1384.patch
>
>
> Spinoff from here:
>
> http://mail-archives.apache.org/mod_mbox/lucene-java-user/200809.mbox/%3Cba72f77f0809111418l29cf215dnd45bf679832d7d42%40mail.gmail.com%3E
> Here's my response on that thread:
> The bug only happens when you call addIndexesNoOptimize, and one
> simple workaround would be to use SerialMergeScheduler.
> I think this is already fixed in trunk (soonish to be 2.4) as a side
> effect of https://issues.apache.org/jira/browse/LUCENE-1335.
> In 2.3, merges that involve external segments (which are segments
> folded in by addIndexesNoOptimize) are not supposed to run in a BG
> thread. This is to prevent addIndexesNoOptimize from returning until
> after all external segments have been carried over (merged or copied)
> into the index, so that if there is an exception (eg disk full),
> addIndexesNoOptimize is able to rollback to the index to the starting
> point.
> The primary merge() method of CMS indeed does not BG any external
> merges, but the bug is that when a BG merge finishes it then selects a
> new merge to kick off and that selection is happy to pick an external
> segment.
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