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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-683) Distributed Search / Shards Deadlock
Date Fri, 15 Aug 2008 16:13:44 GMT

    [ https://issues.apache.org/jira/browse/SOLR-683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12622906#action_12622906
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Yonik Seeley commented on SOLR-683:
-----------------------------------

bq. The connection is only accepted if there's a thread to handle it.

Yes, but not from the normal pool... it looks like there are acceptor threads that do nothing
but accept socket connections.

I just confirmed that setting the acceptQueueSize does not work to reject connections.
I put in a configurable sleep in the search handler and made requests until they started blocking.
 Requests were still accepted and just hung... netstat showed them to be "ESTABLISHED".

Further, setting a really low acceptQueueSize runs the risk of having connections rejected
even in a low-load situation because jetty doesn't accept them fast enough.

> Distributed Search / Shards Deadlock
> ------------------------------------
>
>                 Key: SOLR-683
>                 URL: https://issues.apache.org/jira/browse/SOLR-683
>             Project: Solr
>          Issue Type: Bug
>          Components: search
>    Affects Versions: 1.3
>         Environment: Linux
> jre1.6.0_05
> 8GB RAM
> 2 x 2 core AMD 2.4 Ghz
> 2 x 140GB disk
>            Reporter: Cameron
>            Assignee: Yonik Seeley
>             Fix For: 1.3
>
>         Attachments: locked.log, SOLR-683.patch
>
>
> Per this discussion:
> http://www.nabble.com/Distributed-Search-Strategy---Shards-td18882112.html
> Solr seems to lock up when running distributed search on three servers, with all three
using shards of each other.  Thread dump attached.

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