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Андрей,
On 3/14/12 2:17 PM, Андрей Беликов wrote:
> Hi... I am running Apache Tomcat Version 7.0.26 with SOLR 3.5 on
> jdk1.7.0_03
>
> The problem is that i cannot limit count of connections. I never
> get connection refused (only timeouts). For example:
> maxThreads="150" and acceptCount="100", as i think i will have
> 150+100=250 connections in ESTABLISHED state, and all others will
> be refused.
>
> But in realy: #netstat -na | grep 8080 | awk '{print $6}' | sort |
> uniq -c | sort -rn 3899 FIN_WAIT2 3385 ESTABLISHED 243 TIME_WAIT 9
> CLOSE_WAIT 3 FIN_WAIT1 1 SYN_SENT 1 LISTEN
>
> Probe (http://localhost:8080/probe/connectors.htm) return me
> Connectors Count: 150
>
> http://localhost:8080/probe/threadpools.htm Threads count Name
> Current Busy Max Spare1 Spare2 "ajp-apr-8009" 0 0
> 4096 0 0 "http-apr-8080" 150 150 150 0
> 0 AJPThreadPool 0 0 4096 0 200
> HTTPThreadPool 150 150 150 150 20
>
> As I think: connections comes to some buffer (may be JVM) and
> slowly transferres to TOMCAT... It is not good for my task, the
> best way is to recieve 250 connections and all other to refuse. How
> I can do this?
>
> /data/servers/solr_tomcat/conf/server.xml:
>
> <?xml version='1.0' encoding='utf-8'?> <Server port="8005"
> shutdown="SHUTDOWN">
>
> [snip]
>
> <Executor name="AJPThreadPool" namePrefix="AJPThread-"
> maxThreads="4096" minSpareThreads="150"/>
>
> <Executor name="HTTPThreadPool" namePrefix="HTTPThread-"
> maxThreads="150" minSpareThreads="20"/>
>
> <Connector executor="HTTPThreadPool" port="8080"
> protocol="org.apache.coyote.http11.Http11AprProtocol"
> redirectPort="8443" URIEncoding="UTF-8"
> maxHttpHeaderSize="8388608"
OMG that header size is HUGE. Do you really expect 8MiB of headers?
Are people sending SOLR documents in cookies or something?
> maxThreads="150" maxKeepAliveRequests="1" enableLookups="false"
> acceptCount="100" connectionTimeout="3000" />
Note that you aren't limiting the number of connections. Note that you
are specifying "maxThreads" which is irrelevant when you are using an
executor.
Read the docs for <Connector>:
http://tomcat.apache.org/tomcat-7.0-doc/config/http.html
Specifically, read the part about "maxConnections".
Also, since you are using AJP on one of those <Connectors>, your web
server should probably be taking care of connection-limiting at that end.
- -chris
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