Strange read after work entry processor operation of

Hello.
We use the listener of combination cache - processor of entry to certain actions when the data comes from coherence. We use Version consistency Oracle 3.5.3/465.

Just after the entry processor has defined the new value for the entry, the new 'get' operation is called for the cache and jdbc hit is for this key.

Here's the entry processor:
public Object process(Entry entry) {        
        if (!entry.isPresent()) {
            // No entities exist for this CoreMatchingString - creating new Matching unit
            MatchingUnit newUnit = new MatchingUnit(newTrade);
            entry.setValue(newUnit, true);
            
            return null;
        }

        ((MatchingUnit)entry.getValue()).processMatching(newTrade);

        return null;
    }
Very interesting, that if I use entry.setValue (value) without second parameter - I get the db hit right on the setValue method. According to the docs, setValue() with a parameter returns the previous value and its logic, that the cache hit (and therefore the PB hit) is right on the tray. But I use the overloaded version Sub setValue (java.lang.Object evaluating, boolean fSynthetic), which is supposed to be light and should not seek a previous version of the object. But this is done in any case! Not on SetValue himself, but just after the process() method called.

It's strange, that consistency is trying to retrieve the previous value in the present case, that there was no! The cache.invoke (matchingStr, CCPEntryProcessor (ccp)) new is called on the record not exist and it is created right on the invocation. Maybe it's the bug or the place for optimization.

Thank you

BITEC wrote:
Thank you, Robert, for this detailed response.

Still not clear to me why the synthetic inserts are questionable. There are many cases, when the client simply updates/inserts recording (using setValue()) and don't don't don't need to receive the previous value. If he needs to, he will launch the method:

Hi Anton,.

It is questionable because the purpose of the indicator fSynthetic is NOT that you can optimize a store operation hidden far. Synthetic event means that it is not a real change in the whole of data triggered by the user, it's something that consistency has made in terms of support / cover for its own reasons and decisions to be able to provide high availability for data, and it only changes of subset of this particular node of data consistency but has no meaning associated with the full data set that actually exists. These reasons are movement partition and expulsion of cache (or possibly other reasons why consistency would like to change the content of the carrier sheet without telling the user that nothing has changed).

If you set the indicator, you attempt a change of data of masquerade as an event whose consistency has decided to trigger. It is questionable. Also, events map synthetic support may not always lead to the expedition to cache events (for partition rebalance they certainly not). This optimization can also be extended to cover synthetic events.

java.lang.Object setValue(java.lang.Object oValue)

and receive the previous value. If it does not, it calls:

void setValue(java.lang.Object oValue, boolean fSynthetic)

and does not receive the previous value as method is marked as void. Thus, he cannot get the previous value in any case using this API, with the exception of the call live db manual.

Yes, because the consistency is not interested in the old value in the case of a synthetic event. Synthesis methods exist so that some entry can be changed to coherence (usually by coherence itself) so that it indicates a synthetic event so that listeners are unaware.

Some valid uses for this type of feature to setValue called by user code could be compaction value set caching and replacing the value that stores the support plan by the representation in compact, which does not mean a change in the sense of the actual cached value, only the changes to the representation. Of course if the setValue method (2) is not actually honoring the synthetic indicator, then such a feature will still commit all costs of a call normal setValue (1).

But the previous value is in any case read by coherence itself, just after process() and the customer anyway is not get it!

But all the headphones on the cache may have because of the cache of the semantic reasons.

In this case, I consider that the bug, the cause of the client, which uses this API does not cache hit to take place (no return value for the setValue() method not overloaded), but it takes and leads to additional problems, as a result of reading through mechanizm.

I'd not considered to be a bug, it's probably the case documenting a possible optimization too early, when it ultimately does not get put in place. I certainly wouldn't try to abuse it to set a value without triggering a db extraction, as again, the intention of the synthetic indicator is related not only to the cache loader functionality, but also to events and marking a change indicates a change of actual data or a data consistency management action.

Now I understand why consistency is unclear, if this is inserted or updated, thanks for details value.

Anton.

* Edition: I thought this problem from the point of the oracle user, but perhaps this additional success is necessary for event producers, who must take the events that contain old/new values. In this case, this seems to be the correct behavior... Seems I need some another workaround to avoid the blow of db. The best solution is the empty load() for dumps...

You can try to find a solution, but it's a ugly Pandora's box, because of the scenario when multiple threads try to load the same entry, and some of them try to load it with the reason.

You can try putting a thread local data to indicate that you want really load that special touch. The problem is that depending on the configuration and conditions of race as your cache loader may not be called to clean up local thread as another thread can only be invoked now, and in this case its return value will be returned to all other threads, too, then you can end up with a polluted thread.

Best regards

Robert

Published by: robvarga on October 15, 2010 16:25

Tags: Fusion Middleware

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