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https://issues.apache.org/jira/browse/SOLR-683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12621584#action_12621584
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Yonik Seeley commented on SOLR-683:
-----------------------------------
Here's the problem: deadlock is possible when the max number of concurrent HTTP
requests is less than the number of possible HTTP requests (from both top-level
clients, and by other shards).
Consider the simplest case of two shards, each with just a single thread
dedicated to handling incoming HTTP requests. A top-level request comes into
each shard, and each shard queries the other. The second request to each shard
blocks because the first thread has not yet completed. Deadlock.
> 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
>
>
> 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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