CMP cache limits and passivation
Good day,
We are hitting issues around filling up the EJB cache but we also want
to limit the memory impact of the deployment. What I mean is that if
you have max-beans-in-cache set to 50 and you involve more than 50 EB in
a txn, it throws a cache full exception. We can bump up the cache size,
but for an unbounded collection, this is an artificial fix, another txn
may load more than the new size.
I read in an old posting that the EJB team was looking at passivating EB
involved in a txn to avoid this issue. Was this incorporated into the
engine and if so, how is it controlled?
Thanks,
Sean
Sean Garagan wrote:
Hi Rob,
Thanks for the response.
The only issue about not using an unbounded collection is that entity
beans and finder methods are defined as unbounded collections. If you
use the WLS example of the bands (or the EJB spec of orders and items)
all of the collections are unbounded. Without using WLS specific tags,
there does not seem to be a way to limit the returned values to allow an
EB to batch operations in smaller chunks to alleviate the problem.Indeed. The max-elements tag is in our descriptors to limit the number
of rows returned from the database. It would be nice to see this
standardized.
-- Rob
>
I guess it comes down to another hole in the spec (hopefully one that
will be patched).
Sean
Rob Woollen wrote:
No, passivation during transactions is on the feature plan for a
future release.
That being said, an unbounded collection is probabbly not a great idea
regardless. you don't want to bring back a huge amount of data from
the database, and you don't want us to have to passivate your working
set out of memory.
-- Rob
Sean Garagan wrote:
Good day,
We are hitting issues around filling up the EJB cache but we also
want to limit the memory impact of the deployment. What I mean is
that if you have max-beans-in-cache set to 50 and you involve more
than 50 EB in a txn, it throws a cache full exception. We can bump
up the cache size, but for an unbounded collection, this is an
artificial fix, another txn may load more than the new size.
I read in an old posting that the EJB team was looking at passivating
EB involved in a txn to avoid this issue. Was this incorporated into
the engine and if so, how is it controlled?
Thanks,
Sean
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Max-beans-in-cache, transactions and passivation
WLS 6.1 sp4
database concurrency, oracle
I compute max-beans-in-cache as:
(max # fetched in a transaction) * (number of worker threads)
therefore if I think that a table with have at most 500 rows and the
server is configured with 20 worker threads I have 500 * 20 = 10000 as
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In my test the table has 7 rows. In our load test I see the Beans In
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I have two questions:
1) What does 'Beans In Use Count' really mean
2) why is weblogic using much more memory than it should to store 7 unique entities?
thanksSee my comments below.
S
Chad Urso McDaniel <[email protected]> wrote:
>
I understand this, but WebLogic should either reuse objects in the
cache/pool or not cache them at all. There are cases where the objects in the cahce are used. For e.g. with entity
beans and Read-Only concurrancy, when cache-between-tx is set. However I noticed
this behavior for other cases too and therefore the caching is not all that intellegent.
Also the beans in the pool are reused.
The current situation results in
objects being allocated, referenced by the cache so they will never be
garbage collected, but the objects are never used again once their
transaction completes. This is very, very wasteful with memory.
In some cases as mentioned above.
S
"Sri" <[email protected]> writes:
Hi,
The reason for having so many entries is due to fact that there isno way WLS
would know there are only 7 rows in the db everytime an entity beanis created/modified/accessed.
For e.g., if you run a test where you do 'findAll' the first run wouldhave 7
beans and the next most likely (There is another parameter that youcould use
to control number of beans in the cache, idle-timeout-seconds. Thoughits not
clear from the doc how the entity beans are handled wrt this parameter,it might
passivate entity beans if this timeout occurs) 14 and so on. If thisis a overhead
for your system then reduce this number.
S
container start removing beans before Chad Urso McDaniel <[email protected]>
wrote:
WLS 6.1 sp4
database concurrency, oracle
I compute max-beans-in-cache as:
(max # fetched in a transaction) * (number of worker threads)
therefore if I think that a table with have at most 500 rows and the
server is configured with 20 worker threads I have 500 * 20 = 10000as
my max-beans-in-cache.
In my test the table has 7 rows. In our load test I see the BeansIn
Use Count go up to 9999 instances and then start passivation.
I have two questions:
1) What does 'Beans In Use Count' really mean
2) why is weblogic using much more memory than it should to store7 unique
entities?
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