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Subject: Re: FW: tomcat 8080 thread not reduced
To: users@tomcat.apache.org
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From: =?UTF-8?Q?Andr=c3=a9_Warnier_=28tomcat=29?= <aw@ice-sa.com>
Message-ID: <587C9F6B.7090107@ice-sa.com>
Date: Mon, 16 Jan 2017 11:24:43 +0100
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archived-at: Mon, 16 Jan 2017 10:24:51 -0000

On 16.01.2017 11:10, smith wrote:
> We has same problem on dev env that no any traffic to the serive,

Ah. That is /new/ information, which may change the suggestions below.
It looks like you should really find out what these threads are doing, probably by doing a 
few thread dumps.
See here e.g. : http://stackoverflow.com/questions/18573411/tomcat-thread-dump

Again : we do not know your application, so we can only make guesses based on the 
information that you provide.

  will try on dev first
>
> -----Original Message-----
> From: André Warnier (tomcat) [mailto:aw@ice-sa.com]
> Sent: Monday, January 16, 2017 10:08 AM
> To: users@tomcat.apache.org
> Subject: Re: FW: tomcat 8080 thread not reduced
>
> On 16.01.2017 09:50, smith wrote:
>> Busy one is process customer request, do not know what non-busy one is
>> doing, always keep 120 for many days. I don't think 20s timeout will
>> not cause so long connection
>>
>> -smith
>
> And did you actually try it ?
>
> We do not know your website or your application, so we cannot tell how many clients there are, what these clients are really requesting, how many requests each client is sending before going away, etc.
>
> KeepAlive means that when a client has sent its /last/ request and received the response, one thread is going to remain "not free" (but doing nothing) for the duration of the KeepAlive timeout. This thread will keep waiting, for KeepAliveTimeout seconds, just in case the client would still send another request (which it may never do, depending on the application).
>
> Imagine that your application is so that the average client
> - connects to your site
> - sends a single HTTP request, which gets processed in 0.1 s
> - receives the response
> - and then goes away
> and that the above sequence happens once every second, from different clients.
> After one second, there will be one thread waiting for another 19 seconds before becoming free (and potentially destroyed or re-used). After 2 seconds, there will be 2 such threads. After 3 seconds, 3 threads. And so on. After 20 seconds, the first thread will be freed, but there will be 19 other threads still waiting, and one new thread just created.
> If everything stays perfectly regular like that, your will have /permanently/ 20 threads in existence, even if the minimum is 10.
> If you change the above so that there is a new client every 0.5 s, you will have permanently 40 threads (of which only 2 maximum are really doing something).
>
> The point is : KeepAlive is not "bad", and in some cases having a relatively long KeepAliveTimeout is the right thing to do.  Also, having a high number of threads sitting idle is not necessarily a problem.
> Your own scenario is probably not like the above perfectly regular and irrealistic one above. But there may be a perfectly logical reason why you have so many threads on average, and I am just trying to give you ideas for finding out the reason.
>
>
>>
>> -----Original Message-----
>> From: André Warnier (tomcat) [mailto:aw@ice-sa.com]
>> Sent: Monday, January 16, 2017 8:33 AM
>> To: users@tomcat.apache.org
>> Subject: Re: FW: tomcat 8080 thread not reduced
>>
>> On 16.01.2017 03:41, Smith Hua wrote:
>>>
>>> actually there is not much busy threads, less tahn 10,so i think this
>>> parameter may has nothing to do with this
>>
>> It depends on what you call "busy". What are the busy ones doing ? and what are the non-busy ones doing ?
>>
>>
>>> --
>>> 从myMail的Android专用app所发送 星期一, 16 一月 2017, 03:01上午 +08:00 发件人 André Warnier (tomcat)  aw@ice-sa.com :
>>>
>>>> Hi.
>>>>
>>>> I can find nothing really wrong in your configuration below.
>>>> But, what happens if in this section :
>>>>
>>>>     >      <Connector port="8080" protocol="HTTP/1.1"
>>>>     >                 maxThreads="300" connectionTimeout="20000"
>>>>     >                 redirectPort="8443" />
>>>>
>>>> you change the connectionTimeout to 3000 (= 3 seconds, instead of the above 20 seconds) ?
>>>>
>>>> Do you still see the number of threads remaining at the maximum ?
>>>>
>>>> See :
>>>> http://tomcat.apache.org/tomcat-8.0-doc/config/http.html#Standard_Im
>>>> plementation
>>>> --> connectionTimeout
>>>> and the fact that it is also the default for keepAliveTimeout
>>>>
>>>>
>>>> On 14.01.2017 07:30, smith wrote:
>>>>> The server.xml:
>>>>>
>>>>> <?xml version='1.0' encoding='utf-8'?>
>>>>> <!--
>>>>>       Licensed to the Apache Software Foundation (ASF) under one or more
>>>>>       contributor license agreements.  See the NOTICE file distributed with
>>>>>       this work for additional information regarding copyright ownership.
>>>>>       The ASF licenses this file to You under the Apache License, Version 2.0
>>>>>       (the "License"); you may not use this file except in compliance with
>>>>>       the License.  You may obtain a copy of the License at
>>>>>
>>>>>     http://www.apache.org/licenses/LICENSE-2.0
>>>>>
>>>>>       Unless required by applicable law or agreed to in writing, software
>>>>>       distributed under the License is distributed on an "AS IS" BASIS,
>>>>>       WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
>>>>>       See the License for the specific language governing permissions and
>>>>>       limitations under the License.
>>>>> -->
>>>>> <!-- Note:  A "Server" is not itself a "Container", so you may not
>>>>>          define subcomponents such as "Valves" at this level.
>>>>>          Documentation at /docs/config/server.html
>>>>>      -->
>>>>> <Server port="8005" shutdown="SHUTDOWN">
>>>>>       <Listener className="org.apache.catalina.startup.VersionLoggerListener" />
>>>>>       <!-- Security listener. Documentation at /docs/config/listeners.html
>>>>>       <Listener className="org.apache.catalina.security.SecurityListener" />
>>>>>       -->
>>>>>       <!--APR library loader. Documentation at /docs/apr.html -->
>>>>>       <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
>>>>>       <!-- Prevent memory leaks due to use of particular java/javax APIs-->
>>>>>       <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
>>>>>       <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
>>>>>       <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
>>>>>
>>>>>       <!-- Global JNDI resources
>>>>>            Documentation at /docs/jndi-resources-howto.html
>>>>>       -->
>>>>>       <GlobalNamingResources>
>>>>>         <!-- Editable user database that can also be used by
>>>>>              UserDatabaseRealm to authenticate users
>>>>>         -->
>>>>>         <Resource name="UserDatabase" auth="Container"
>>>>>                   type="org.apache.catalina.UserDatabase"
>>>>>                   description="User database that can be updated and saved"
>>>>>                   factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
>>>>>                   pathname="conf/tomcat-users.xml" />
>>>>>       </GlobalNamingResources>
>>>>>
>>>>>       <!-- A "Service" is a collection of one or more "Connectors" that share
>>>>>            a single "Container" Note:  A "Service" is not itself a "Container",
>>>>>            so you may not define subcomponents such as "Valves" at this level.
>>>>>            Documentation at /docs/config/service.html
>>>>>        -->
>>>>>       <Service name="Catalina">
>>>>>
>>>>>         <!--The connectors can use a shared executor, you can define one or more named thread pools-->
>>>>>         <!--
>>>>>         <Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
>>>>>             maxThreads="150" minSpareThreads="4"/>
>>>>>         -->
>>>>>
>>>>>
>>>>>         <!-- A "Connector" represents an endpoint by which requests are received
>>>>>              and responses are returned. Documentation at :
>>>>>              Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
>>>>>              Java AJP  Connector: /docs/config/ajp.html
>>>>>              APR (HTTP/AJP) Connector: /docs/apr.html
>>>>>              Define a non-SSL HTTP/1.1 Connector on port 8080
>>>>>         -->
>>>>>         <Connector port="8080" protocol="HTTP/1.1"
>>>>>                    maxThreads="300" connectionTimeout="20000"
>>>>>                    redirectPort="8443" />
>>>>>         <!-- A "Connector" using the shared thread pool-->
>>>>>         <!--
>>>>>         <Connector executor="tomcatThreadPool"
>>>>>                    port="8080" protocol="HTTP/1.1"
>>>>>                    connectionTimeout="20000"
>>>>>                    redirectPort="8443" />
>>>>>         -->
>>>>>         <!-- Define a SSL HTTP/1.1 Connector on port 8443
>>>>>              This connector uses the NIO implementation that requires the JSSE
>>>>>              style configuration. When using the APR/native implementation, the
>>>>>              OpenSSL style configuration is required as described in the APR/native
>>>>>              documentation -->
>>>>>         <!--
>>>>>         <Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol"
>>>>>                    maxThreads="150" SSLEnabled="true" scheme="https" secure="true"
>>>>>                    clientAuth="false" sslProtocol="TLS" />
>>>>>         -->
>>>>>
>>>>>         <!-- Define an AJP 1.3 Connector on port 8009 -->
>>>>>         <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
>>>>>
>>>>>
>>>>>         <!-- An Engine represents the entry point (within Catalina) that processes
>>>>>              every request.  The Engine implementation for Tomcat stand alone
>>>>>              analyzes the HTTP headers included with the request, and passes them
>>>>>              on to the appropriate Host (virtual host).
>>>>>              Documentation at /docs/config/engine.html -->
>>>>>
>>>>>         <!-- You should set jvmRoute to support load-balancing via AJP ie :
>>>>>         <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
>>>>>         -->
>>>>>         <Engine name="Catalina" defaultHost="localhost">
>>>>>
>>>>>           <!--For clustering, please take a look at documentation at:
>>>>>               /docs/cluster-howto.html  (simple how to)
>>>>>               /docs/config/cluster.html (reference documentation) -->
>>>>>           <!--
>>>>>           <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
>>>>>           -->
>>>>>
>>>>>           <!-- Use the LockOutRealm to prevent attempts to guess user passwords
>>>>>                via a brute-force attack -->
>>>>>           <Realm className="org.apache.catalina.realm.LockOutRealm">
>>>>>             <!-- This Realm uses the UserDatabase configured in the global JNDI
>>>>>                  resources under the key "UserDatabase".  Any edits
>>>>>                  that are performed against this UserDatabase are immediately
>>>>>                  available for use by the Realm.  -->
>>>>>             <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
>>>>>                    resourceName="UserDatabase"/>
>>>>>           </Realm>
>>>>>
>>>>>           <Host name="localhost"  appBase="webapps"
>>>>>                 unpackWARs="true" autoDeploy="true">
>>>>>
>>>>>             <!-- SingleSignOn valve, share authentication between web applications
>>>>>                  Documentation at: /docs/config/valve.html -->
>>>>>             <!--
>>>>>             <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
>>>>>             -->
>>>>>
>>>>>             <!-- Access log processes all example.
>>>>>                  Documentation at: /docs/config/valve.html
>>>>>                  Note: The pattern used is equivalent to using pattern="common" -->
>>>>>
>>>>> 	<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
>>>>>                    prefix="localhost_access_log" suffix=".txt"
>>>>>                    pattern="%h,%t,%m,%U,%H,%s,%B,%D,%{User-Agent}i" />
>>>>>
>>>>>             <Context path="" allowLinking="true" crossContext="true" docBase="/****/t" sessionCookieName="****" />
>>>>>           </Host>
>>>>>         </Engine>
>>>>>       </Service>
>>>>> </Server>
>>>>>
>>>>> -----Original Message-----
>>>>> From: André Warnier (tomcat) [mailto:aw@ice-sa.com]
>>>>> Sent: Friday, January 13, 2017 10:42 AM
>>>>> To:  users@tomcat.apache.org
>>>>> Subject: Re: FW: tomcat 8080 thread not reduced
>>>>>
>>>>> On 13.01.2017 09:38, smith wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> From: smith [mailto:smith.hua@zoom.us]
>>>>>> Sent: Tuesday, January 10, 2017 9:57 AM
>>>>>> To: 'users'
>>>>>> Subject: tomcat 8080 thread not reduced
>>>>>>
>>>>>>
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>>
>>>>>>
>>>>>> We have installed Apache Tomcat/8.0.14, and found that after one period of time, the thread count for 8080(our port published) goes to 120 and never reduced even the busy count is only 3-4.
>>>>>>
>>>>>> Why? Tomcat8 not reduced the thread pool even the thread is idle, and the minSpareThreads for tomcat8 default is only 10.
>>>>>>
>>>>>> When will the thread reduce?
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Best regards
>>>>>>
>>>>>> Smith
>>>>>>
>>>>>>
>>>>>
>>>>> Hi.
>>>>>
>>>>> Please copy/paste your complete server.xml configuration file (confidential things removed), so that we could have a useful look at it.
>>>>> Please edit *only* the confidential things, not entire sections. Often, the issue is in the details.
>>>>>
>>>>>
>>>>>
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>>>>>
>>>>>
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>>>>>
>>>>
>>>>
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>>>>
>>
>>
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