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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-937) CacheManager max memory size
Date Wed, 24 Oct 2007 09:34:51 GMT

    [ https://issues.apache.org/jira/browse/JCR-937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12537255
] 

Thomas Mueller commented on JCR-937:
------------------------------------

Hi,

I agree the cache size calculation is not accurate. The question is, how exact does it need
to be?

I don't think that the original reporter of the problem used long strings: the problem was
too many caches (hundreds if not thousands). The reason for that many caches is not known,
for this we need a reproducible test case.

> CacheManager max memory size
> ----------------------------
>
>                 Key: JCR-937
>                 URL: https://issues.apache.org/jira/browse/JCR-937
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: jackrabbit-core
>    Affects Versions: 1.3
>            Reporter: Xiaohua Lu
>            Assignee: Thomas Mueller
>            Priority: Minor
>         Attachments: CacheManagerTest.java
>
>
> I have ran into OutOfMemory a couple of times with Jackrabbit (cluster, 4 nodes, each
has 1G mem heap size). 
> After adding some debug into the CacheManager, I noticed that maxMemorySize (default
to 16M) is not really honored during resizeAll check.  Each individual MLRUItemStateCache
seems to honor the size, but the total number/size of MLRUItemStateCache is not. If you put
some print statement of totalMemoryUsed and unusedMemory, you can see that totalMemoryUsed
is more than 16M and unusedMemory is negative. 
> The other problem we have noticed during the profiling is there are a lots of other in
memory objects that are consuming memory but not included in CacheManager caches control.
One example is CachingHierarchyManager which consumed 58M out of 242M through its use of PathMap.
If CacheManager's maxSize can control the total cache size used by Jackrabbit, that would
be easier from a management's perspective. (btw, upper_limit in CachingHierarchyManager is
hardcoded and can't be control from outside)

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