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References: 
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	<50783C1E.8020007@christopherschultz.net>
Date: Mon, 15 Oct 2012 10:42:09 +0400
Message-ID: 
 <CAFq8QLWyrVwJsJjdBXi6odmMwdGjHFV6zyYxWpnuKx+iMfta1w@mail.gmail.com>
Subject: Re: tomcat 7 APR Connector problems
From: Andrey Timofeyev <andrey.timofeyev@gmail.com>
To: Tomcat Users List <users@tomcat.apache.org>, chris@christopherschultz.net
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Hi Chris,

thank you so much for answer,

> What about your Tomcat configuration:
<Server port="8005" shutdown="SHUTDOWN">
    <Listener className="org.apache.catalina.core.AprLifecycleListener"
SSLEngine="on"/>
    <Service name="Catalina">
        <Connector
                   maxPostSize="5242880"
                   enableLookups="false"
                   useBodyEncodingForURI="true"
                   port="80"
                   maxThreads="1100"
                   disableUploadTimeout="true"
                   maxHttpHeaderSize="8192"
                   pollerSize="16768"
                   maxKeepAliveRequests="-1"
                   connectionTimeout="20000"
                   asyncTimeout="110000"
                   keepAliveTimeout="120000"
                   compression="on"

 compressableMimeType="text/html,text/xml,text/plain,text/css,text/javascript,application/javascript,application/x-javascript"
                   address="{...}"
                   acceptCount="1000"/>
        <Connector
                   maxPostSize="5242880"
                   enableLookups="false"
                   useBodyEncodingForURI="true"
                   port="82"
                   maxThreads="100"
                   disableUploadTimeout="true"
                   maxHttpHeaderSize="8192"
                   pollerSize="100"
                   maxKeepAliveRequests="-1"
                   connectionTimeout="20000"
                   keepAliveTimeout="120"
                   compression="on"

 compressableMimeType="text/html,text/xml,text/plain,text/css,text/javascript,application/javascript,application/x-javascript"
                   address="{...}"
                   acceptCount="100"/>
        <Connector
                   maxPostSize="5242880"
                   enableLookups="false"
                   useBodyEncodingForURI="true"
                   port="443"
                   maxThreads="1100"
                   disableUploadTimeout="true"
                   maxHttpHeaderSize="8192"
                   pollerSize="32768"
                   maxKeepAliveRequests="-1"
                   connectionTimeout="20000"
                   keepAliveTimeout="120000"
                   compression="on"

 compressableMimeType="text/html,text/xml,text/plain,text/css,text/javascript,application/javascript,application/x-javascript"
                   address="0.0.0.0"
                   acceptCount="100" scheme="https" secure="true"
                   SSLEnabled="true"
                   SSLCipherSuite="HIGH:MEDIUM:!ADH:!SSLv2"
                   SSLCertificateFile="{...}"
                   SSLCertificateKeyFile="{...}"
                   SSLCertificateChainFile="{...}"/>
        <Engine name="Catalina" defaultHost="{...}">
            <Host name="{...}"
                  appBase="{...}"
                  autoDeploy="false"
                  unpackWARs="true"
                  deployXML="false">
                <Context path="" allowLinking="true" useHttpOnly="false">
                    <Manager className="{customSessionManager}"
                             maxActiveSessions="163840"
                             maxInactiveInterval="1800"
                             pathname=""/>
                </Context>
                <Context path="/manager"
                         privileged="true"
                         docBase="{...}">
                    <Realm
className="org.apache.catalina.realm.MemoryRealm"
pathname="conf/tomcat-users.xml"/>
                    <Valve
className="org.apache.catalina.valves.RemoteAddrValve"
                           allow="{...}"/>
                </Context>
                <Context path="/share" docBase="{deploy.dir}/res/share"/>
                <Context path="/res" docBase="{deploy.dir}/res"/>
                <Context path="/web/gwt" docBase="{deploy.dir}/web/gwt"/>
                <Context path="/web/gwt-alt"
docBase="{deploy.dir}/web/gwt-alt"/>
            </Host>
        </Engine>
    </Service>
</Server>

> Do you get exceptions or apparent deadlock? Can you generate a thread
dump?
There are no any deadlock or aniything strange compared to life server (i
will generate it one yet time, may be i missed something)

> Are your client connections long-lived
Average client connection live 11 minutes.

> What does 'ulimit -n' tell you
256k

2012/10/12 Christopher Schultz <chris@christopherschultz.net>

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Andrey,
>
> On 10/12/12 11:30 AM, Andrey Timofeyev wrote:
> > Hi, everybody,
> >
> > There is followen problem with tomcat 7.0.29 (With tomcat 6.0.18
> > there is no such problem):
> >
> > Any other services on the same machine lost connections with
> > remote services, when number of incoming connections to tomcat
> > reach pollerSize. (It seems that all file descriptors is used or
> > something else)
> >
> > As I see in the tomcat 7  latch was added in AprEndpoint, and if
> > connections reach maxLimit Acceptor locked on the latch.
> >
> > Here is server configuration: Linux 2.6.34.6-uni-02 #1 SMP Mon Sep
> > 19 17:13:09 MSD 2011 x86_64 x86_64 x86_64 GNU/Linux APR:
> > libapr1-1.4.6-3.8 kernel.panic = 20
> > net.ipv4.conf.all.accept_redirects = 0
> > net.ipv4.conf.default.accept_redirects = 0
> > net.ipv4.conf.all.rp_filter = 0 net.ipv4.conf.default.rp_filter =
> > 0 net.ipv4.icmp_echo_ignore_broadcasts = 1 vm.min_free_kbytes =
> > 65536 vm.swappiness = 0 net.core.optmem_max = 16777216
> > net.core.rmem_max = 16777216 net.core.rmem_default = 16777216
> > net.core.wmem_max = 16777216 net.core.wmem_default = 16777216
> > net.ipv4.tcp_rmem = 4096 16777216 16777216 net.ipv4.tcp_wmem = 4096
> > 16777216 16777216 net.core.netdev_max_backlog = 300000
> > net.core.somaxconn = 65536 net.ipv4.tcp_max_orphans = 262144
> > net.ipv4.tcp_max_syn_backlog = 65536 net.ipv4.tcp_max_tw_buckets =
> > 1048576 net.ipv4.tcp_sack = 1 net.ipv4.tcp_synack_retries = 3
> > net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_syn_retries = 3
> > net.ipv4.tcp_timestamps = 1 net.ipv4.tcp_window_scaling = 1
> > net.ipv4.conf.all.arp_filter = 1 net.ipv4.conf.default.arp_filter =
> > 1 net.ipv4.conf.all.arp_ignore = 1 net.ipv4.conf.default.arp_ignore
> > = 1 net.ipv4.conf.all.arp_announce = 2
> > net.ipv4.conf.default.arp_announce = 2
> > net.ipv4.neigh.default.gc_thresh1 = 2048
> > net.ipv4.neigh.default.gc_thresh2 = 4096
> > net.ipv4.neigh.default.gc_thresh3 = 8192
> >
> > Is it tomcat issue or some misconfiguration?
>
> What about your Tomcat configuration?
>
> Do you get exceptions or apparent deadlock? Can you generate a thread
> dump? Are your client connections long-lived? How long? What does
> 'ulimit -n' tell you?
>
> - -chris
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-- 
Best regards,
Andrey.

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