[HTTPCORE-421] RouteSpecificPool timeout Occuring processing HTTP request while using NIO

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Invalid
• Component/s: HttpCore NIO
• Labels: features
• Environment: Centos machine 1 core,Some times simulatable on linux machine 4 core
• External issue URL: http://stackoverflow.com/questions/36360673/routespecificpool-timeout-occuring-processing-http-request-while-using-nio
• Assignee: Unassigned
• Reporter: Venkata Satya Teja Siram
• Created: 01/Apr/16 20:13
• Updated: 06/Apr/16 08:37
• Resolved: 06/Apr/16 07:47

Description

Hi Team,
We have an application in which we are making an asynchronous request to get the response.For making asynchronous Request we are using apache nio

Reference link followed:
https://hc.apache.org/httpcomponents-core-ga/tutorial/html/nio.html

While using this we are facing an issue.The issue is also not always simulatable.I was not able to figure out the root* cause.

The issue details are as follows:
java.net.ConnectException: null
at org.apache.http.nio.pool.RouteSpecificPool.timeout(RouteSpecificPool.java:170) [httpcore-nio-4.4.4.jar:4.4.4]
at org.apache.http.nio.pool.AbstractNIOConnPool.requestTimeout(AbstractNIOConnPool.java:560) [httpcore-nio-4.4.4.jar:4.4.4]
at org.apache.http.nio.pool.AbstractNIOConnPool$InternalSessionRequestCallback.timeout(AbstractNIOConnPool.java:821) [httpcore-nio-4.4.4.jar:4.4.4]
at org.apache.http.impl.nio.reactor.SessionRequestImpl.timeout(SessionRequestImpl.java:182) [httpcore-nio-4.4.4.jar:4.4.4]
at org.apache.http.

Version being used:

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.1</version>
</dependency>

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore-nio</artifactId>
<version>4.4.4</version>
</dependency>

Initially i thought issue was with pool and increased pool size(NIO Pool) while load testing. But some times it occurs if a send single request only ,although pool size is 1000 ,the issue is occurring.

Is this issue has something related to cpu core size, on 4 core processor its happening very less and on single core processor it occurs very frequency
is more..For NIO reactor , we have given the default config.As the documentation specifies the number of dispatcher threads would be dependent on number of cores on the system.

Any help regarding this issue?