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From "Michajlo Matijkiw (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HTTPCLIENT-1000) Configure Maximum Connection Lifetimes
Date Wed, 22 Sep 2010 16:29:35 GMT

    [ https://issues.apache.org/jira/browse/HTTPCLIENT-1000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913650#action_12913650
] 

Michajlo Matijkiw commented on HTTPCLIENT-1000:
-----------------------------------------------

>From what I've gathered from the code, the BasicPoolEntry expiry field is used to close
a connection after it has been idle for some time, so as long as a connection is being used
its expiry can continuously be pushed back, and the connection will last indefinitely.  I
have been looking into redefining the expiry to be the lesser of expiry in its current definition
and the time its expiration date based on TTL.  This will bound expiry's growth ensuring that
the connection will not last indefinitely.

Could you elaborate more on what adding methods to ManagedClientConnection would break?  I
have added isExpired to it and implemented it in BasicPoolConnAdapter and ConnAdapter and
everything appears fine, however, there are a lot of things I am unfamiliar with.  The difficulty
is that we would like to force DefaultRequestDirector to give up a managed connection that
is expired, but there is no way of figuring it out from there.

On the other hand, perhaps the RequestDirector will let go of requests frequently enough that
it will not matter?  I am working on better understanding how/if DefaultRequestDirector reuses
ManagedClientConnections.

Thanks,
Michajlo

> Configure Maximum Connection Lifetimes
> --------------------------------------
>
>                 Key: HTTPCLIENT-1000
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1000
>             Project: HttpComponents HttpClient
>          Issue Type: Improvement
>          Components: HttpClient
>            Reporter: Michajlo Matijkiw
>
> Provide a means of configuring a maximum lifetime for HttpClient connections.  Currently,
it would appear as long as a connection is used it may persist indefinitely.
> This would be useful for situations where HttpClient needs to react to DNS changes, such
as the following situation that may occur when using DNS load balancing:
>  - HttpClient maintains connections to example.com which resolves to IP A
>  - Machine at IP A fails, and example.com now resolves to backup machine at IP B
>  - Since IP A is failing, connections are destroyed, and new connections are made to
IP B
>  - Machine at IP A recovers, but HttpClient maintains connections to IP B since the connections
are still healthy
> The desired behavior would be that connections to IP B will reach their connection lifetime,
and new connections could be created back to IP A according to the updated DNS settings.

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