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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: Telling HC to make new connections all the time
Date Tue, 21 Jun 2016 08:41:31 GMT
On Mon, 2016-06-20 at 13:57 -0400, Benson Margulies wrote:
> We use the async http components library to connect various components
> in a system that is deployed, in some cases, on AWS. When it's
> deployed on AWS, there are ELBs involved.
> 
> Like some other people, we've having various trauma dealing with the
> very dynamic environment of AWS ELBs, which includes constant DNS
> changes and some other issues. So far, we've been making our HC
> configuration more and more complex. I'm wondering if we should back
> off and make it simpler -- make a new connection for each request.
> Obviously, this will be somewhat slower and more expensive, but at the
> moment we might prefer a slower and more expensive approach that works
> to one that occasionally gets lost.
> 
> I appreciate that even making new connections all the time won't
> compensate for all possible DNS problems -- if Java itself caches a
> stale name->address translation, making a new connection will fail
> just as effectively as anything else.
> 
> Does anyone out there have advice to share (other than running away from ELB)?
> 

Hi Benson

I personally would consider disabling connection persistence extreme and
unnecessary. Consider setting the TTL (total time to live) of persistent
connections to some low value (say, 10 seconds or even less) instead.
This should improve distribution of connections across the cluster of
servers behind a load balancer.  

Hope it helps

Oleg


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