Tomcat connector Elements Common configuration (maximum number of connections, etc.)

There are similar server.xml in Tomcat:

<connector port="8080"Protocol="http/1.1"connectiontimeout="20000"redirectport="8443"maxsparethreads=" -"maxthreads=" +"minsparethreads=" -"Acceptcount=" +"maxprocessors=" +"uriencoding="GBK"Usebodyencodingforuri="true"/>

The configuration, where:

acceptcount= "1000" acceptable maximum number of connections

maxprocessors= "1000" Maximum number of active threads

port= "8080" service port

Protocol= "http/1.1" service agreement

connectiontimeout= "20000" time-out unit is MS

redirectport= the "8443" redirect Port requires secure communication, the client request is forwarded to the Redirectport port of SSL

Maxthreads:tomcat the maximum number of threads that can be created, each thread processes a request; MaxThreads determines the maximum thread threshold for Tomcat, which needs to be set to a larger

Minsparethreads: The minimum number of standby threads, the number of threads initialized at Tomcat startup;

Maxsparethreads: Maximum number of spare threads, once the thread is created that exceeds this value, Tomcat shuts down the socket thread that is no longer needed;

Uriencoding= "GBK" to set the Tomcat default transcoding format

View $tomcat_home/webapps/tomcat-docs/config/http.html This documentation, with the following instructions: uriencoding:this Specifies the character encoding Used to decode the URI bytes, after%xx decoding the URL. If not specified, iso-8859-1 'll be used. In other words, if uriencoding is not set, tomcat defaults to URL decoding by iso-8859-1, Iso-8859-1 does not include Chinese characters, so the Chinese characters must not be parsed correctly.

Reprint someone else's blog:

one. Tomcat Connection Pool configuration Tomcat wants to withstand large concurrency and must increase the number of connections, and the general Tomcat Connector can be modified as follows:

<ConnectorPort= "80"Protocol= "http/1.1"ConnectionTimeout= "60000"Redirectport= "8443"MaxThreads= "5000" Acceptcount= "= " Maxsparethreads= " Enablelookups=" false "  Compression=" on " Compressionminsize= "2048"  Compressablemimetype= "Text/html,text/xml,text/javascript,text/css,text/plain"  disableuploadtimeout< Span style= "color: #0000ff;" >= "true"  Uriencoding=" UTF-8 " />         

Some of the key parameters are:

connectiontimeout: The connection time-out, in milliseconds. For high concurrency the real-time requirements are not high can be made appropriate increase this value

maxthreads: Maximum number of concurrent connections

Acceptcount: The number of queued lines that can be accepted after the maximum number of connections

minsparethreads: The number of threads that are created by default when Tomcat is initialized, and the minimum number that is incremented at a later time when the thread increases

maxsparethreads: This parameter identifies that if the number of threads created exceeds this value, Tomcat closes the inactive thread

enablelookups: turn off DNS queries in the implementation, we find that using this configuration, the number of connections is difficult to descend after, resulting in the CPU has been maintained at a relatively high level.
Later we switched to a connection method, using the thread pool, first defining a executor:

<name= "Tomcatthreadpool"         nameprefix= "tomcatthreadpool-" maxthreads= "1000" maxidletime= "300000" minsparethreads= "$"/>        

The meaning of the parameter is the same as above
Use this connection pool as defined in connector:

<Executor= "Tomcatthreadpool"           port= "20003" protocol= "http/1.1" acceptcount = "Minprocessors" = "+" = "redirectport" =   "8443"/>   

Minprocessors,maxprocessors is similar to the minsparethreads,maxthreads above. After the connection pool is used, the number of connections is increased, and if there is no request for a period of time, the number of connections drops quickly, the CPU consumption is reduced effectively, and the processing power is improved.

How do I see the current number of Tomcat connections?

Assume that 2 Tomcat instances are open on the server, listening to 8040 and 8050 ports, respectively

Netstat-na | grep estab | grep 8040 | Wc-l

Netstat-na | grep estab | grep 8050 | Wc-l

The sum of the two is the number of connections for all Tomcat

Tomcat connector Elements Common configuration (maximum number of connections, etc.)