move SSTableScanner to use SSTableReader.dfile instead of BRAF
--------------------------------------------------------------
Key: CASSANDRA-2459
URL: https://issues.apache.org/jira/browse/CASSANDRA-2459
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Pavel Yaskevich
Assignee: Pavel Yaskevich
Fix For: 1.0
That can give us the following benefits:
a). don't need to skip a cache because we will be operating on memory mappings
b). better performance (not copying data between kernel and user buffers as
effect gained from using memory mapped segments, avoiding time operating on the
kernel mode (+ time for switching context and read-ahead pressure) which BRAF
involves)
c). less impact on the live-reads
d). less garbage will be created
e). less file descriptors opened
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
