Chetan Mehrotra created OAK-891:
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Summary: Use DirectMemory as Level 2/Offheap cache
Key: OAK-891
URL: https://issues.apache.org/jira/browse/OAK-891
Project: Jackrabbit Oak
Issue Type: Improvement
Components: core
Affects Versions: 0.8
Reporter: Chetan Mehrotra
To make optimum use of memory allocated to the various caches created in Oak it
would be better to use Apache DirectMemory [1] as the level 2 (L2) cache.
Further using Kryo[2] Serializer would enable saving of serialized objects in
more compact form
* Storing cache objects in serialized form provides a more compact storage
* Deserializtion cost is low
* Using Off heap memory would be helpful compared to on heap memory
* L2 cache can be added as an optional feature. Oak Core can still be
used in absence of L2 cache
Implementation details
* [Feature Branch|https://github.com/chetanmeh/jackrabbit-oak/tree/offheap]
* [Diff
|https://github.com/chetanmeh/jackrabbit-oak/compare/apache:ab955ffd40e23a9f8aee87f9076bc045b643e35d...offheap]
* Test cases to be added
Implementation notes
* Adds DirectMemory and Kryo library as optional dependencies
* Decorates the Guava Cache to move the evicted objects to L2 cache
* Using L2 cache is completely optional
* Kryo library is used to provide fast and compact serialization.
* Uses custom serializers for various cache instances to provide a more compact
storage
* Instead of using the key as is (i.e. path in MongoMK) it stores the hash of
the path to conserve memory
Initial discussion at http://markmail.org/thread/xief4l25m7tnx52c
[1] http://directmemory.apache.org/
[2] https://code.google.com/p/kryo/
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