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https://issues.apache.org/jira/browse/SOLR-4696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13627890#comment-13627890
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Walter Underwood commented on SOLR-4696:
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How many open connections does netstat show? The normal behavior for PHP is to
open a brand-new HTTP connection for every single request. As far as I can
tell, PHP has no support for connection pooling or reuse.
> All threads become blocked resulting in hang when bulk adding
> -------------------------------------------------------------
>
> Key: SOLR-4696
> URL: https://issues.apache.org/jira/browse/SOLR-4696
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.1, 4.2, 4.2.1
> Environment: Ubuntu 12.04.2 LTS 3.5.0-27-generic
> Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)
> KVM, 4xCPU, 5GB RAM, 4GB heap.
> 4 cores, 2 shards, 2 nodes, tomcat7
> Reporter: matt knecht
> Labels: hang
> Attachments: screenshot-1.jpg, solrconfig.xml, solr.jstack.1,
> solr.jstack.2
>
>
> During a bulk load after about 150,000 documents load, thread usage spikes,
> solr no longer processes any documents. Any additional documents added
> result in a new thread until the pool is exhausted.
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