[jira] [Created] (CASSANDRA-7438) Serializing Row cache alternative (Fully off heap)

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

Vijay created CASSANDRA-7438:
--------------------------------

             Summary: Serializing Row cache alternative (Fully off heap)
                 Key: CASSANDRA-7438
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7438
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
         Environment: Linux
            Reporter: Vijay
            Assignee: Vijay
             Fix For: 3.0


Current off heap row cache is just partially off heap the keys are still stored in memory, 

* There is a higher GC costs for a reasonably big cache.
* Some users have used the row cache efficiently in production for better results, but this requires carful tunning.
* Overhead in Memory for the cache entries are relatively high.

So the proposal for this ticket is to move the LRU cache logic completely off heap and use JNI to interact with cache. We might want to ensure that the new implementation match the existing API's (ICache), and the implementation needs to have safe memory access, low overhead in memory and less memcpy's (As much as possible).

We might also want to make this cache configurable.



--
This message was sent by Atlassian JIRA
(v6.2#6252)