probably don't need to do full copy to row cache after un-mmap() change
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Key: CASSANDRA-3223
URL: https://issues.apache.org/jira/browse/CASSANDRA-3223
Project: Cassandra
Issue Type: Bug
Reporter: Yang Yang
Priority: Minor
3179 changes from directly using the bytebuffer from mmap(), to copying that
buffer,
CFS.cacheRow()
https://github.com/apache/cassandra/blob/cassandra-1.0.0/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
line 1126
says it makes a deep copy exactly to prevent issues from unmmap().
maybe this deep copy is not needed now given 3179
if so, maybe slightly better performance in both speed and memory
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