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Posted to dev@synapse.apache.org by "Isuru Udana Loku Narangoda (JIRA)" <ji...@apache.org> on 2014/07/13 09:38:04 UTC
[jira] [Resolved] (SYNAPSE-989) Extra TCP Connections get created
under high concurrency
[ https://issues.apache.org/jira/browse/SYNAPSE-989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Isuru Udana Loku Narangoda resolved SYNAPSE-989.
------------------------------------------------
Resolution: Fixed
Fix Version/s: 3.0
Fix applied in r1610131
> Extra TCP Connections get created under high concurrency
> --------------------------------------------------------
>
> Key: SYNAPSE-989
> URL: https://issues.apache.org/jira/browse/SYNAPSE-989
> Project: Synapse
> Issue Type: Bug
> Reporter: Isuru Udana Loku Narangoda
> Assignee: Isuru Udana Loku Narangoda
> Priority: Blocker
> Fix For: 3.0
>
> Attachments: CloneProxy.xml, SYNAPSE-989.patch
>
>
> This is observable with following proxy configuration. To clearly see the alive connections we need to increase the backend latency.
> <proxy name="CloneProxy" xmlns="http://ws.apache.org/ns/synapse">
> <target>
> <inSequence>
> <property name="NO_KEEPALIVE" value="true" scope="axis2"/>
> <clone>
> <target>
> <sequence>
> <send>
> <endpoint>
> <address
> uri="http://localhost:9000/services/SimpleStockQuoteService"/>
> </endpoint>
> </send>
> </sequence>
> </target>
> <target>
> <sequence>
> <send>
> <endpoint>
> <address
> uri="http://localhost:9000/services/SimpleStockQuoteService"/>
> </endpoint>
> </send>
> </sequence>
> </target>
> <target>
> <sequence>
> <send>
> <endpoint>
> <address
> uri="http://localhost:9000/services/SimpleStockQuoteService"/>
> </endpoint>
> </send>
> </sequence>
> </target>
> <target>
> <sequence>
> <send>
> <endpoint>
> <address
> uri="http://localhost:9000/services/SimpleStockQuoteService"/>
> </endpoint>
> </send>
> </sequence>
> </target>
> <target>
> <sequence>
> <send>
> <endpoint>
> <address
> uri="http://localhost:9000/services/SimpleStockQuoteService"/>
> </endpoint>
> </send>
> </sequence>
> </target>
> </clone>
> </inSequence>
> <outSequence>
> <aggregate>
> <onComplete xmlns:m0="http://services.samples"
> expression="//m0:getQuoteResponse">
> <send/>
> </onComplete>
> </aggregate>
> </outSequence>
> </target>
> </proxy>
> According to this configuration only 5 connections need to be created with the backend server for a single request sent to the proxy. But synapse creates additional connections. Following is the netstat output.
> watch -n1 -d "netstat -n -tap | grep 29860"
> Every 1.0s: netstat -n -tap | grep 29860
> tcp6 0 0 :::8243 :::* LISTEN 29860/java
> tcp6 0 0 :::46903 :::* LISTEN 29860/java
> tcp6 0 0 :::8280 :::* LISTEN 29860/java
> tcp6 0 0 :::1099 :::* LISTEN 29860/java
> tcp6 0 0 127.0.0.1:56884 127.0.0.1:9000 ESTABLISHED 29860/java
> tcp6 0 0 127.0.0.1:56885 127.0.0.1:9000 ESTABLISHED 29860/java
> tcp6 0 0 127.0.0.1:56886 127.0.0.1:9000 ESTABLISHED 29860/java
> tcp6 0 0 127.0.0.1:56887 127.0.0.1:9000 ESTABLISHED 29860/java
> tcp6 0 0 127.0.0.1:56889 127.0.0.1:9000 ESTABLISHED 29860/java
> tcp6 0 0 127.0.0.1:56890 127.0.0.1:9000 ESTABLISHED 29860/java
> tcp6 0 0 127.0.0.1:8280 127.0.0.1:35665 ESTABLISHED 29860/java
> tcp6 0 0 127.0.0.1:56888 127.0.0.1:9000 ESTABLISHED 29860/java
> We can see 7 connections get created. Excess 2 connections remains for sometime after all the other connections get terminated.
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