use MMapedBuffer in CompressedSegmentedFile.getSegment
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Key: CASSANDRA-3623
URL: https://issues.apache.org/jira/browse/CASSANDRA-3623
Project: Cassandra
Issue Type: Improvement
Components: Core
Affects Versions: 1.1
Reporter: Vijay
Assignee: Vijay
Fix For: 1.1
CompressedSegmentedFile.getSegment seem to open a new file and doesnt seem to
use the MMap and hence a higher CPU on the nodes and higher latencies on reads.
This ticket is to implement the TODO mentioned in CompressedRandomAccessReader
// TODO refactor this to separate concept of "buffer to avoid lots of read()
syscalls" and "compression buffer"
but i think a separate class for the Buffer will be better.
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