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Posted to user@cayenne.apache.org by Andrus Adamchik <an...@objectstyle.org> on 2010/05/20 10:14:50 UTC
Re: Exception when caching a SelectQuery with prefetching [WAS: Caching]
One thing to keep in mind here is that OSQueryCacheFactory is not
tested with persistent cache... It works perfect with in-memory cache,
but I always thought that persisting the data that is sort of already
persisted in the DB doesn't buy us much, so that scenario never got
any attention. E.g. I wouldn't be surprised if de-serialization of the
cache causes even more issues.
Andrus
On May 20, 2010, at 10:03 AM, Andrey Razumovsky wrote:
> Looks like a bug. Could you please open a ticket?
>
> 2010/5/20 Gary Jarrel <ga...@gmail.com>
>
>> Hi,
>> I managed to get the cache issue described below resolved, my error
>> with the DataContextFilter that I was using and it was overwriting
>> the
>> modeler configuration when initializing shared config.
>>
>> I've ran into another issue with the following code:
>>
>> SelectQuery q = proto.queryWithParameters(params);
>> q.addPrefetch(RichProduct.MANUFACTURER_PROPERTY);
>> q.addPrefetch(RichProduct.RAW_PRODUCT_PROPERTY);
>> q.setCacheStrategy(QueryCacheStrategy.SHARED_CACHE);
>> q.setCacheGroups("products");
>>
>> Upon execution of this query I get the following exception:
>>
>> ERROR
>> com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache
>> [oscache] Exception persisting RichProduct/subCategory =
>> <ObjectId:SubCategory, category_id=1,
>> id=1>/categoryName/subCategoryName/cost
>> com.opensymphony.oscache.base.persistence.CachePersistenceException:
>> Unable to write
>> '/tmp/cache/application/0/0/5/005126BC80FABAA4C582919EDF0B9304.cache'
>> in the cache. Exception: java.io.NotSerializableException, Message:
>> org.apache.cayenne.access.ListWithPrefetches
>> at
>> com
>> .opensymphony
>> .oscache
>> .plugins
>> .diskpersistence
>> .AbstractDiskPersistenceListener
>> .store(AbstractDiskPersistenceListener.java:376)
>> at
>> com
>> .opensymphony
>> .oscache
>> .plugins
>> .diskpersistence
>> .AbstractDiskPersistenceListener
>> .store(AbstractDiskPersistenceListener.java:238)
>>
>> <rest of stack trace removed>
>>
>> If I however remove the prefetches then the caching works fine.
>>
>> Looking at the source code for ListWithPrefetches it does not
>> implement Serializable, could this be the reason for it, or am I
>> missing something!
>>
>> Thank you
>>
>> Gary
>>
>> On Wed, May 19, 2010 at 6:17 PM, Gary Jarrel <ga...@gmail.com>
>> wrote:
>>>
>>> Hi Guys,
>>> I seem to full of questions today!
>>> In the modeler I've got
>>> org.apache.cayenne.cache.OSQueryCacheFactory for
>> Query Cache Factory, 5000 objects and using shared cache.
>>> I can see OSCache initializing in the logs and everything appears
>>> to be
>> fine.
>>> However when I try to get the cache from the ObjectContext like so:
>>> QueryCache cache = ((BaseContext)
>>> getObjectContext()).getQueryCache();
>>> The cache that is being returned is
>> the org.apache.cayenne.cache.MapQueryCache
>>> I've traced the calls and can see that the call got
>>> getQueryCache() goes
>> to MapQueryCacheFactory despite the fact that the modeler
>> specifies OSQueryCacheFactory
>>> Am I doing something wrong here?
>>> Thank you
>>> Gary
>>
>
>
>
> --
> Andrey
Re: Exception when caching a SelectQuery with prefetching [WAS: Caching]
Posted by Andrus Adamchik <an...@objectstyle.org>.
Yeah, wouldn't hurt to have a record of this case. Maybe we'll come up
with some solution, or at least do a bit more testing.
Andrus
On May 20, 2010, at 3:22 PM, Gary Jarrel wrote:
> Yes this was in fact the case, works fine with in memory caching.
>
> Should I still lodge a ticket?
>
> G
>
> On Thu, May 20, 2010 at 6:14 PM, Andrus Adamchik <andrus@objectstyle.org
> > wrote:
>> One thing to keep in mind here is that OSQueryCacheFactory is not
>> tested
>> with persistent cache... It works perfect with in-memory cache, but
>> I always
>> thought that persisting the data that is sort of already persisted
>> in the DB
>> doesn't buy us much, so that scenario never got any attention. E.g. I
>> wouldn't be surprised if de-serialization of the cache causes even
>> more
>> issues.
>>
>> Andrus
>>
>>
>> On May 20, 2010, at 10:03 AM, Andrey Razumovsky wrote:
>>
>>> Looks like a bug. Could you please open a ticket?
>>>
>>> 2010/5/20 Gary Jarrel <ga...@gmail.com>
>>>
>>>> Hi,
>>>> I managed to get the cache issue described below resolved, my error
>>>> with the DataContextFilter that I was using and it was
>>>> overwriting the
>>>> modeler configuration when initializing shared config.
>>>>
>>>> I've ran into another issue with the following code:
>>>>
>>>> SelectQuery q = proto.queryWithParameters(params);
>>>> q.addPrefetch(RichProduct.MANUFACTURER_PROPERTY);
>>>> q.addPrefetch(RichProduct.RAW_PRODUCT_PROPERTY);
>>>> q.setCacheStrategy(QueryCacheStrategy.SHARED_CACHE);
>>>> q.setCacheGroups("products");
>>>>
>>>> Upon execution of this query I get the following exception:
>>>>
>>>> ERROR
>>>> com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache
>>>> [oscache] Exception persisting RichProduct/subCategory =
>>>> <ObjectId:SubCategory, category_id=1,
>>>> id=1>/categoryName/subCategoryName/cost
>>>> com
>>>> .opensymphony.oscache.base.persistence.CachePersistenceException:
>>>> Unable to write
>>>> '/tmp/cache/application/
>>>> 0/0/5/005126BC80FABAA4C582919EDF0B9304.cache'
>>>> in the cache. Exception: java.io.NotSerializableException, Message:
>>>> org.apache.cayenne.access.ListWithPrefetches
>>>> at
>>>>
>>>> com
>>>> .opensymphony
>>>> .oscache
>>>> .plugins
>>>> .diskpersistence
>>>> .AbstractDiskPersistenceListener
>>>> .store(AbstractDiskPersistenceListener.java:376)
>>>> at
>>>>
>>>> com
>>>> .opensymphony
>>>> .oscache
>>>> .plugins
>>>> .diskpersistence
>>>> .AbstractDiskPersistenceListener
>>>> .store(AbstractDiskPersistenceListener.java:238)
>>>>
>>>> <rest of stack trace removed>
>>>>
>>>> If I however remove the prefetches then the caching works fine.
>>>>
>>>> Looking at the source code for ListWithPrefetches it does not
>>>> implement Serializable, could this be the reason for it, or am I
>>>> missing something!
>>>>
>>>> Thank you
>>>>
>>>> Gary
>>>>
>>>> On Wed, May 19, 2010 at 6:17 PM, Gary Jarrel <ga...@gmail.com>
>>>> wrote:
>>>>>
>>>>> Hi Guys,
>>>>> I seem to full of questions today!
>>>>> In the modeler I've got
>>>>> org.apache.cayenne.cache.OSQueryCacheFactory for
>>>>
>>>> Query Cache Factory, 5000 objects and using shared cache.
>>>>>
>>>>> I can see OSCache initializing in the logs and everything
>>>>> appears to be
>>>>
>>>> fine.
>>>>>
>>>>> However when I try to get the cache from the ObjectContext like
>>>>> so:
>>>>> QueryCache cache = ((BaseContext)
>>>>> getObjectContext()).getQueryCache();
>>>>> The cache that is being returned is
>>>>
>>>> the org.apache.cayenne.cache.MapQueryCache
>>>>>
>>>>> I've traced the calls and can see that the call got
>>>>> getQueryCache() goes
>>>>
>>>> to MapQueryCacheFactory despite the fact that the modeler
>>>> specifies OSQueryCacheFactory
>>>>>
>>>>> Am I doing something wrong here?
>>>>> Thank you
>>>>> Gary
>>>>
>>>
>>>
>>>
>>> --
>>> Andrey
>>
>>
>
Re: Exception when caching a SelectQuery with prefetching [WAS:
Caching]
Posted by Gary Jarrel <ga...@gmail.com>.
Yes this was in fact the case, works fine with in memory caching.
Should I still lodge a ticket?
G
On Thu, May 20, 2010 at 6:14 PM, Andrus Adamchik <an...@objectstyle.org> wrote:
> One thing to keep in mind here is that OSQueryCacheFactory is not tested
> with persistent cache... It works perfect with in-memory cache, but I always
> thought that persisting the data that is sort of already persisted in the DB
> doesn't buy us much, so that scenario never got any attention. E.g. I
> wouldn't be surprised if de-serialization of the cache causes even more
> issues.
>
> Andrus
>
>
> On May 20, 2010, at 10:03 AM, Andrey Razumovsky wrote:
>
>> Looks like a bug. Could you please open a ticket?
>>
>> 2010/5/20 Gary Jarrel <ga...@gmail.com>
>>
>>> Hi,
>>> I managed to get the cache issue described below resolved, my error
>>> with the DataContextFilter that I was using and it was overwriting the
>>> modeler configuration when initializing shared config.
>>>
>>> I've ran into another issue with the following code:
>>>
>>> SelectQuery q = proto.queryWithParameters(params);
>>> q.addPrefetch(RichProduct.MANUFACTURER_PROPERTY);
>>> q.addPrefetch(RichProduct.RAW_PRODUCT_PROPERTY);
>>> q.setCacheStrategy(QueryCacheStrategy.SHARED_CACHE);
>>> q.setCacheGroups("products");
>>>
>>> Upon execution of this query I get the following exception:
>>>
>>> ERROR com.opensymphony.oscache.base.algorithm.AbstractConcurrentReadCache
>>> [oscache] Exception persisting RichProduct/subCategory =
>>> <ObjectId:SubCategory, category_id=1,
>>> id=1>/categoryName/subCategoryName/cost
>>> com.opensymphony.oscache.base.persistence.CachePersistenceException:
>>> Unable to write
>>> '/tmp/cache/application/0/0/5/005126BC80FABAA4C582919EDF0B9304.cache'
>>> in the cache. Exception: java.io.NotSerializableException, Message:
>>> org.apache.cayenne.access.ListWithPrefetches
>>> at
>>>
>>> com.opensymphony.oscache.plugins.diskpersistence.AbstractDiskPersistenceListener.store(AbstractDiskPersistenceListener.java:376)
>>> at
>>>
>>> com.opensymphony.oscache.plugins.diskpersistence.AbstractDiskPersistenceListener.store(AbstractDiskPersistenceListener.java:238)
>>>
>>> <rest of stack trace removed>
>>>
>>> If I however remove the prefetches then the caching works fine.
>>>
>>> Looking at the source code for ListWithPrefetches it does not
>>> implement Serializable, could this be the reason for it, or am I
>>> missing something!
>>>
>>> Thank you
>>>
>>> Gary
>>>
>>> On Wed, May 19, 2010 at 6:17 PM, Gary Jarrel <ga...@gmail.com>
>>> wrote:
>>>>
>>>> Hi Guys,
>>>> I seem to full of questions today!
>>>> In the modeler I've got org.apache.cayenne.cache.OSQueryCacheFactory for
>>>
>>> Query Cache Factory, 5000 objects and using shared cache.
>>>>
>>>> I can see OSCache initializing in the logs and everything appears to be
>>>
>>> fine.
>>>>
>>>> However when I try to get the cache from the ObjectContext like so:
>>>> QueryCache cache = ((BaseContext) getObjectContext()).getQueryCache();
>>>> The cache that is being returned is
>>>
>>> the org.apache.cayenne.cache.MapQueryCache
>>>>
>>>> I've traced the calls and can see that the call got getQueryCache() goes
>>>
>>> to MapQueryCacheFactory despite the fact that the modeler
>>> specifies OSQueryCacheFactory
>>>>
>>>> Am I doing something wrong here?
>>>> Thank you
>>>> Gary
>>>
>>
>>
>>
>> --
>> Andrey
>
>