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

["Simon Willnauer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-5006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Willnauer updated LUCENE-5006:
------------------------------------

    Attachment: LUCENE-5006.patch

Here is an updated version of the patch that was running CI builds for over a month without a failure [here|http://builds.flonkings.com/job/DWPT_Refactoring/] I think we are ready to commit this here. 
                
> 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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