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From "Nina Kumar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HTTPCLIENT-1609) Implementation of validate() Required In CPool
Date Thu, 21 May 2015 04:12:00 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14553597#comment-14553597
] 

Nina Kumar commented on HTTPCLIENT-1609:
----------------------------------------

Our services recently upgraded from 4.3.3 to 4.4.1.
Service got NoHttpResponseException when number of requests send concurrently.
Looks like issue not resolved in 4.4.1

> Implementation of validate() Required In CPool
> ----------------------------------------------
>
>                 Key: HTTPCLIENT-1609
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1609
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpClient
>    Affects Versions: 4.4 Final
>            Reporter: Charles Lip
>              Labels: patch
>             Fix For: 4.4.1
>
>
> In httpclient-4.4, org.apache.http.impl.conn.CPool directly inherits the dummy method
validate() from abstract class org.apache.http.pool.AbstractConnPool:-
> /** * @since 4.4 */
> protected boolean validate(final E entry)
> { return true; }
> Given that validate() always return TRUE, a critical portion of codes related to "closing
stale connection" in method AbstractConnPool .getPoolEntryBlocking() is rendered unreachable.
> Snippet of codes showing the unreachable part of method AbstractConnPool .getPoolEntryBlocking():
> ....
> else if (this.validateAfterInactivity > 0) {
>    if (entry.getUpdated() + this.validateAfterInactivity <=   System.currentTimeMillis())
{
>       if (!validate(entry)) {
>          entry.close(); //unreachable
>       }
>    }
> }
> ... ..
> PoolingHttpClientConnectionManager, which is supported by CPool, is impaired by this
defect for stale connection management logics involving validateAfterInactivity property.
> CPool class needs a proper implementation of method validate(); a possible fix would
be:
> @Override
> protected boolean validate(final CPoolEntry entry) {
>  return !entry.getConnection().isStale();
> }



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