10:02 a.m.
I've tried starting the cache but does not seem to work as expected since the JOIN_REQ
is set to itself (the coordinator) and the target is removed at transport. You could maybe
hack this by calling directly DMI if you yourself are the target however that seems to
cause more havoc. Looking for more alternative solutions.
----- "Galder Zamarreno" <galder(a)jboss.org> wrote:
Actually, doing this seems more complex than I originally thought.
Specially when you take in account that you could have multiple caches
checking the coordinator and expecting it to return the CH address
list. For example, if you have nodes A, B and C and assuming B and C
had requests on 'hotRodDistSync', B could assume it's only himself,
but when C comes in, how's A gonna tell that B is part of the CH
address list?
Another possibility I'm toying with is for the coordinator to start
the given cache if it does not exist in cache manager.
----- galder(a)redhat.com wrote:
> Hi,
>
> Re: https://jira.jboss.org/jira/browse/ISPN-425
>
> We've been discussing solutions to the fundamental problem in this
> issue which is the fact that operations are allowed in the cache
> before rehashing has finished starting up. I've been playing around
> with a solution based around waiting for rehashing to complete but
> this is causing issues with Hot Rod distribution tests. In Hot Rod,
> this is what happens:
>
> 1. Start Hot Rod server 1 which starts a replicated topology cache.
> 2. Start Hot Rod server 2 which starts a replicated topology cache.
> 3. Send a request for a distributed cache called 'hotRodDistSync' in
> Hot Rod server 2.
> 4. As a result of this request, 'hotRodDistSync' cache should be
> started up but it does not succeed. It stays in a Rehash join loop,
> saying:
>
> 4595 INFO [org.infinispan.remoting.InboundInvocationHandlerImpl]
> (OOB-2,Infinispan-Cluster,eq-52045:) Cache named hotRodDistSync does
> not exist on this cache manager!
> 4595 TRACE [org.infinispan.marshall.VersionAwareMarshaller]
> (OOB-2,Infinispan-Cluster,eq-52045:) Wrote version 410
> 4596 TRACE [org.infinispan.marshall.VersionAwareMarshaller]
> (OOB-2,Infinispan-Cluster,eq-64501:) Read version 410
> 4596 TRACE
>
[org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher]
> (Rehasher-eq-64501:) responses: [sender=eq-52045, retval=null,
> received=true, suspected=false]
>
> 4597 DEBUG [org.infinispan.distribution.JoinTask]
> (Rehasher-eq-64501:) Retrieved old consistent hash address list null
> 4597 TRACE [org.infinispan.distribution.JoinTask]
> (Rehasher-eq-64501:) Sleeping for 1.54 seconds
>
> The problem here is that Hot Rod server 1 has not yet started
> 'hotRodDistSync' cache since no requests where sent to it. Now, this
> is different to the cache not allowing invocations yet cos it's in
> middle of the startup. So, I wondered if
> InboundInvocationHandlerImpl.handle() could return a custom response
> rather than null and for JoinTask to handle it in such a way that if
> all the responses received say that the cache does not exist, then
> consider rehash completed and finish the process.
>
> Now, the reason I'm saying to return a custom response is because I
> can see that JOIN_REQ returning null can also mean that the
> coordinator is in the middle of another join
> (DMI.requestPermissionToJoin). These two situations are not the
same,
> hence why I suggest a different treatment.
>
> Cheers,
> --
> Galder Zamarreño
> Sr. Software Engineer
> Infinispan, JBoss Cache
>
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