Re: [infinispan-dev] design for cluster events (wiki page)
On 10/31/2013 08:10 AM, Bela Ban wrote:
Just to clarify, can you comment on whether the statements below are
true ?
#1 When mode=repl is used, the event itself is never broadcast; it is
always local and no communication is needed
Related to that - is the filter always
applied only on primary owner? If
the registering node is backup owner, it could omit the communication as
well.
#2 when mode=dist, is the event broadcast synchronously or
asynchronously, can this be configured ? I think it doesn't make sense
to broadcast the event synchronously in dist-async, for instance.
+1 The sync/async
nature of the events should be configurable, and
behaviour with async cache clearly stated.
Regarding #2: if this mechanism is used unwisely, a user can destroy all
the advantages (perf) brought by DIST by causing a broadcast for every
update. Is there anything to prevent this (e.g. a sanity check at startup) ?
One of
advantages of distributed mode is the memory requirement - this
wouldn't be destroyed, but sure, the cluster wouldn't scale anymore.
Nevertheless I think that the filter is sufficient prevention (maybe the
API shouldn't allow null filter as "accept all" solution, because that
would lead to exactly this situation).
Btw., do we expect two events for each modification (pre/post), or only
single one? If the listener throws an exception is this propagated to
the node where the write originates?
One more thing not clearly stated on the wiki: the order is probably
guaranteed only with respect to one entry - ordering within multiple
writes (for example within the same transaction) is not guaranteed.
Radim
On 10/30/13 8:33 PM, Mircea Markus wrote:
> Okay, and now the good URL (3rd try):
https://github.com/infinispan/infinispan/wiki/Clustered-listeners
>
> On Oct 30, 2013, at 7:31 PM, Mircea Markus <mmarkus(a)redhat.com> wrote:
>
>> Ups, wrong URL.
>>
>> This is the design for cluster events:
https://github.com/infinispan/infinispan/wiki/Handling-cluster-partitions
>>
>>
>> On Oct 30, 2013, at 7:05 PM, Mircea Markus <mmarkus(a)redhat.com> wrote:
>>
>>> Hi,
>>>
>>> I've added a wiki page[1] capturing our discussions around cluster
events.
>>> Any feedback welcomed!
>>>
>>> [1]
https://github.com/infinispan/infinispan/wiki/Handling-cluster-partitions
>>>
>>> Cheers,
>>> --
>>> Mircea Markus
>>> Infinispan lead (www.infinispan.org)
>>>
>>>
>>>
>>>
>> Cheers,
>> --
>> Mircea Markus
>> Infinispan lead (www.infinispan.org)
>>
>>
>>
>>
> Cheers,
>
--
Radim Vansa <rvansa(a)redhat.com>
JBoss DataGrid QA