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Benedict edited comment on CASSANDRA-7438 at 11/29/14 9:40 AM: --------------------------------------------------------------- Good point! But invert those two statements and the behaviour is still broken. B: 154 :map.get() A: 187: map.remove() A: 191: queue.deleteFromQueue() B: 158: queue.addToQueue() was (Author: benedict): Invert those two statements and the behaviour is still broken. B: 154 :map.get() A: 187: map.remove() A: 191: queue.deleteFromQueue() B: 158: queue.addToQueue() > 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 > Labels: performance > Fix For: 3.0 > > Attachments: 0001-CASSANDRA-7438.patch, tests.zip > > > Currently SerializingCache is partially off heap, keys are still stored in > JVM heap as BB, > * 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 careful 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 (v6.3.4#6332)