[jira] [Created] (OAK-2779) DocumentNodeStore should provide option to set initial cache size as percentage of MAX VM size

["Will McGauley (JIRA)" <ji...@apache.org>]

Will McGauley created OAK-2779:
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             Summary: DocumentNodeStore should provide option to set initial cache size as percentage of MAX VM size
                 Key: OAK-2779
                 URL: https://issues.apache.org/jira/browse/OAK-2779
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: mongomk
    Affects Versions: 1.2
            Reporter: Will McGauley
             Fix For: 1.2.1


Currently the DocumentNodeStore provides a way to configure various cache parameters, including cache size and distribution of that size to various caches.  The distribution of caches is done as a % of the total cache size, which is very helpful, but the overall cache size can only be set as a literal value.

It would be helpful to achieve a good default value based on the available VM memory as a %, instead of a literal value.  By doing this the cache size would not need to be set by each customer, and a better initial experience would be achieved.  

I suggest that 25% of the max VM size would be a good starting point.



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