[infinispan-dev] Infinispan Cache Store Failure Detection and Recovery

[Tristan Tarrant]

Hi Cosmin,

sorry for the delay.
Yes, the correct approach would be to implement some kind of 
"UnreliableCacheReader/Writer" as a wrapper to a concrete Cache Store, 
which would ignore any errors in the underlying store. This wrapper 
would also probably implement some kind of fail-fast mechanism so that 
it would only retry going to a failing store after a certain time has 
elapsed, to avoid unnecessary repeat failures.

I have created [1] to track this, so please let's add any concerns/ideas 
to that.

Tristan

[1] https://issues.jboss.org/browse/ISPN-6097

On 19/01/2016 18:32, Cosmin Stroe wrote:
> Hello everyone,
>
> We're setting up an Infinispan deployment for a web application.  Our
> use case includes a local Infinispan cache (running in the same JVM as
> the web app) backed by a remote Infinispan cache (running in a separate
> JVM).
>
> We have to investigate failure modes of said cache.  One of the
> scenarios we have to handle is "What happens if the remote Infinispan
> cache goes away?".  This could happen for various reasons, including if
> we restart the remote Infinispan cache.  We would like to have some
> known state during remote cache outages (which we hope would happen very
> infrequently).
>
> My conversation with "ttarrant" on Freenode led us to believe that
> Infinispan doesn't currently have any failure mode handling built in,
> and that it's possible that we could make the Async Store decorator
> optionally be able to "resist" store failures.  Not sure what other
> options we have.
>
> The correct answer might also be, "Just have the cache return null if an
> entry is not in the local cache and the remote cache is unresponsive,
> and have the application gracefully handle the empty cache".  I'm not
> sure if that option can be implemented with the current Infinispan code.
>
> Any thoughts on this?
> Cosmin.
>
>
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-- 
Tristan Tarrant
Infinispan Lead
JBoss, a division of Red Hat