[infinispan-dev] GetKeyValueCommand NPE with CR1 in Hibernate 2LC - ISPN-7029
Radim Vansa
rvansa at redhat.com
Thu Feb 16 09:43:01 EST 2017
On 02/16/2017 02:53 PM, William Burns wrote:
>
>
> On Thu, Feb 16, 2017 at 8:51 AM Radim Vansa <rvansa at redhat.com
> <mailto:rvansa at redhat.com>> wrote:
>
> On 02/16/2017 10:44 AM, Radim Vansa wrote:
> > On 02/15/2017 06:07 PM, Galder Zamarreño wrote:
> >> --
> >> Galder Zamarreño
> >> Infinispan, Red Hat
> >>
> >>> On 15 Feb 2017, at 12:21, Radim Vansa <rvansa at redhat.com
> <mailto:rvansa at redhat.com>> wrote:
> >>>
> >>> On 02/15/2017 11:28 AM, Galder Zamarreño wrote:
> >>>> Hey Radim,
> >>>>
> >>>> Your changes in ISPN-7029 are causing issues with Hibernate 2LC.
> >>>>
> >>>> In particular [2]. Name.equals() always returns false, so
> it'll never be found in the context. So entry is null.
> >>> That's obviously a bug in the 2LC testsuite, isn't it?
> >> LOL, is it? You added the class and the javadoc clearly states
> that this entity defines equals incorrectly. You must have added
> it for a reason?
> >>
> >>
> https://github.com/hibernate/hibernate-orm/blob/master/hibernate-infinispan/src/test/java/org/hibernate/test/cache/infinispan/functional/entities/Name.java
> >>
> >> In any case, an object with an incorrect equals impl should not
> result in an NPE within Infinispan :|
> >>
> >>> Object used as @EmbeddedId needs to have the equals correctly
> defined. How else would you compare ids? I wonder how could that
> work in the past.
> >> ROFL... it's your baby so you tell me ;)
> > Okay, okay - I haven't checked the javadoc, so I just assumed
> that it's
> > an oversight :)
>
> The reason it worked before was that both DC and EntryLookup used
> keyEquivalence for all the comparisons, and 2LC was providing
> TypeEquivalence there. In 9.0 (master) the keyEquivalence was dropped.
> For some reason DataContainerConfigurationBuilder.keyEquivalence
> is not
> marked as deprecated, I'll file a PR for that.
>
>
> The entire DataContainerConfiguration and Builder classes are
> deprecated as well as Equivalence :)
It is, but with @Deprecated (with capital D) in javadoc it did not show
up properly in IntelliJ. I've fixed those [1].
IMO a warning message/exception when an user tries to set up equivalence
other than AnyEquivalence would be even better, silently ignoring that
could lead to obscure problems (when the equivalence definition in the
object and equivalence function differs only in minority of cases).
R.
[1] https://github.com/infinispan/infinispan/pull/4865
>
> R.
>
> >
> >>>> Moreover, if EntryLookup.lookupEntry javadoc (and some
> implementations) can and do return null. Are you expecting that
> somehow that method will never return null?
> >>> With ISPN-7029 in, the entry should be wrapped in the context
> after EntryWrappingInterceptor if the key is in readCH, otherwise
> it should be null. In case that xDistributionInterceptor finds out
> that it needs to work on that value despite not being able to read
> it (e.g. in case that it's in writeCH during unfinished
> rebalance), it should wrap NullCacheEntry.getInstance() using
> EntryFactory. wrapExternalEntry. More info about the logic is in
> o.i.c.EntryFactory javadoc [3].
> >> Not sure I understand what you're trying to imply above... so,
> is lookupEntry() allowed to return null or not?
> > It is allowed to return null, but:
> >
> > 1. If the node is an owner according to readCH, the entry must be
> > wrapped into context in EWI (possibly as NullCacheEntry).
> > 2. The code can reach the GKVC.perform() iff this node is an
> owner of
> > given key.
> >
> > The problem here is that I've assumed that if the entry was
> wrapped, it
> > can be fetched. With incorrectly defined equals, as we see here,
> this
> > does not hold. So we can
> >
> > a) check if the entry is null and throw more explanatory exception -
> > more code in perform()
> > b) do the lookup after wrapping and throw there - unnecessary
> map lookup
> > for such annoying problem
> > c) ostrich approach
> >
> > I think that b) in assert could do, otherwise I'd suggest c)
> >
> > Radim
> >
> >> To be more specific,
> SingleKeyNonTxInvocationContext.lookupEntry() can return null, so
> GetKeyValueCommand should be able to handle it? Or should
> SingleKeyNonTxInvocationContext.lookupEntry return
> NullCacheEntry.getInstance instead of null?
> >>
> >> To provide more specifics, SingleKeyNonTxInvocationContext has
> NullCacheEntry.getInstance in cacheEntry variable when it's
> returning null. Should it maybe return NullCacheEntry.getInstance
> instead of null from lookupEntry() ?
> >>
> >> Cheers,
> >>
> >>> Radim
> >>>
> >>> [3]
> https://github.com/infinispan/infinispan/blob/master/core/src/main/java/org/infinispan/container/EntryFactory.java
> >>>
> >>>> I'll create a JIRA to track all issues arising from Hibernate
> 2LC in a minute, but wanted to get your thoughts firts.
> >>>>
> >>>> Cheers,
> >>>>
> >>>> [1] https://issues.jboss.org/browse/ISPN-7029
> >>>> [2]
> https://github.com/hibernate/hibernate-orm/blob/master/hibernate-infinispan/src/test/java/org/hibernate/test/cache/infinispan/CacheKeysFactoryTest.java#L58
> >>>> --
> >>>> Galder Zamarreño
> >>>> Infinispan, Red Hat
> >>>>
> >>> --
> >>> Radim Vansa <rvansa at redhat.com <mailto:rvansa at redhat.com>>
> >>> JBoss Performance Team
> >
>
>
> --
> Radim Vansa <rvansa at redhat.com <mailto:rvansa at redhat.com>>
> JBoss Performance Team
>
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--
Radim Vansa <rvansa at redhat.com>
JBoss Performance Team
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