[infinispan-dev] Fwd: query npe

Ales Justin ales.justin at gmail.com
Wed Apr 10 08:38:30 EDT 2013


@Bela: is there a config way to make this JGroups backend wait for ACK?

-Ales

Begin forwarded message:

> From: Emmanuel Bernard <emmanuel at hibernate.org>
> Subject: Re: [infinispan-dev] query npe
> Date: April 10, 2013 2:06:20 PM GMT+02:00
> To: infinispan -Dev List <infinispan-dev at lists.jboss.org>
> Reply-To: infinispan -Dev List <infinispan-dev at lists.jboss.org>
> 
> Dan worked to understand the problem, here is where we stand without
> Sanne's additional knowledge.
> 
> The test failing is the following:
> 
>    tx1.start();
>    cache.remove(key);
>    tx1.commit();
>    assert queryDeletedKey.getResults().size() == 0;
> 
> Surprisingly, the entity is still found in the query and Infinispan
> Query returns `null`.
> 
> The reason we suspect is the following. While pushing the index changes
> is done in sync with the transaction commit (tx sync), the backend is
> JGroups and returns right after it has sent the message to the master
> node without waiting for the index ack.
> This is a good thing as it scales much better but has the nice
> side effect of returning incorrect query results right after a change
> set is applied (indexing window + index propagation).
> 
> My recommendation is to make sure Infinispan Query removes entities
> found by the query engine but not present in the grid like we do in
> Hibernate Search for the ORM case. Note that this does not solve the
> case were you add a new entity and expect to query it *right after the
> commit*. There is a similar issue around entity changes. If CapeDwarf
> can live with it it will be better off.
> 
> An alternative solution would be to create a JGroups backend that waits
> for an execution ACK before giving back the had to the client but that
> will have scalability problems.
> 
> Emmanuel
> 
> On Tue 2013-04-09 23:41, Ales Justin wrote:
>> Chasing down today's NPE: http://pastie.org/7382216
>> 
>> I've added this test:
>> * https://github.com/capedwarf/capedwarf-blue/commit/d416d5358
>> 
>> The test fails. ;-)
>> 
>> deleteAndQueryInA(org.jboss.test.capedwarf.cluster.test.QueryTest): Should not be here: null
>> 
>> This is the "null" that is the cause of top NPE.
>> 
>> -Ales
>> 
> 
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> 
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