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https://issues.apache.org/jira/browse/SOLR-9311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15622527#comment-15622527
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Erick Erickson commented on SOLR-9311:
--------------------------------------

Kent:

Ran across this kind of at random. I know there have been a number of 
improvements in this area in the 5.5.3 and 6.2 time-frames, with at least one 
additional improvement coming in the 6.3 (soon to be released) time frame.

At any rate, there is very little chance that any fixes would be back-ported to 
4.x as development has long been stopped on that branch.

So what do you think about closing this ticket?

Best,
Erick

> solrcloud so many connections
> -----------------------------
>
>                 Key: SOLR-9311
>                 URL: https://issues.apache.org/jira/browse/SOLR-9311
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: clients - java
>    Affects Versions: 4.9
>            Reporter: Junfeng Mu
>         Attachments: CPU.png, connections.png, shards.png
>
>
> firstly, I do not know wether it is a bug or a wrong usage. if this is a 
> wrong usage, I will opligize to disturb you, and tell me what the wrong usage 
> is.
> We are using Solrj 4.9.1 to connect to a Zookeeper. and the solr server 
> version is 4.9.0 We are currently using CloudSolrServer as a singleton to 
> operate index data, and I believe that solrj to zookeeper is a TCP 
> connection, and zookeeper to solrcloud internal is actually a httpconnection.
> we use the zabbix to monitor the solrcloud status, and we deploy solr in 
> Wildfly(JBOSS), for example the http port is 8180, we find the number that 
> connecting with solr on port 8180 is so high. for now  we find the number can 
> be around 4000, that is too large.and we find that with the increasing 
> connections, the query speed become slow. the CPU of the solr sever is 
> unstable, and the speed to commit new index data becomes slow as well.
> besides, the JDK version is 1.7.25 to running solr server.
> on the other hand, we have 3 cores with 5 shards, and each shard with one 
> leader and one replication. now the data account goes to be 100 million, and 
> it is still growing up.
> please see the screenshot of Zabbix in the attachments.
> please help me, and looking forward to your reply.
> Thanks.
> Kent



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