[jira] [Commented] (LUCENE-5006) Simplify / understand IndexWriter/DocumentsWriter synchronization

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-5006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13743883#comment-13743883 ] 

ASF subversion and git services commented on LUCENE-5006:
---------------------------------------------------------

Commit 1515459 from [~simonw] in branch 'dev/trunk'
[ https://svn.apache.org/r1515459 ]

LUCENE-5006: Simplified DW and DWPT synchronization and concurrent interaction with IW
                
> Simplify / understand IndexWriter/DocumentsWriter synchronization
> -----------------------------------------------------------------
>
>                 Key: LUCENE-5006
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5006
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Simon Willnauer
>         Attachments: LUCENE-5006.patch, LUCENE-5006.patch, LUCENE-5006.patch
>
>
> The concurrency in IW/DW/BD is terrifying: there are many locks involved, not just intrinsic locks but IW also has fullFlushLock, commitLock, and there are no clear rules about lock order to avoid deadlocks like LUCENE-5002.
> We have to somehow simplify this, and define the allowed concurrent behavior eg when an app calls deleteAll while other threads are indexing.

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