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From "Ning Li (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1335) Correctly handle concurrent calls to addIndexes, optimize, commit
Date Mon, 25 Aug 2008 18:37:44 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625455#action_12625455
] 

Ning Li commented on LUCENE-1335:
---------------------------------

> I don't think so: with autoCommit=true, the merges calls commit(long)
> after finishing, and I think we want those commit calls to run
> concurrently?

After we disable autoCommit, all commit calls will be serialized, right?


> What'll happen is the BG merge will hit an exception, roll itself
> back, and then the FG thread will pick up the merge and try again.
> Likely it'll hit the same exception, which is then thrown back to the
> caller.  It may not hit an exception, eg say it was disk full: the BG
> merge was probably trying to merge 10 segments, whereas the FG merge
> is just copying over the 1 segment.  So it may complete successfully
> too.

Back to the issue of running an external merge in BG or FG.
In ConcurrentMergeScheduler.merge, an external merge is run in FG,
not in BG. But in ConcurrentMergeScheduler.MergeThread.run,
whether a merge is external is no longer checked. Why this difference?


> Correctly handle concurrent calls to addIndexes, optimize, commit
> -----------------------------------------------------------------
>
>                 Key: LUCENE-1335
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1335
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.3, 2.3.1
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 2.4
>
>         Attachments: LUCENE-1335.patch, LUCENE-1335.patch, LUCENE-1335.patch, LUCENE-1335.patch
>
>
> Spinoff from here:
>     http://mail-archives.apache.org/mod_mbox/lucene-java-dev/200807.mbox/%3Cc7b302c50807111018j58b6d08djd56b5889f6b3780d@mail.gmail.com%3E

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