Matt Stump created CASSANDRA-7938:
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Summary: Releases prior to 2.1 gratuitously invalidate buffer cache
Key: CASSANDRA-7938
URL: https://issues.apache.org/jira/browse/CASSANDRA-7938
Project: Cassandra
Issue Type: Bug
Components: Core
Reporter: Matt Stump
RandomAccessReader gratuitously invalidates the buffer cache in releases prior
to 2.1.
Additionally, Linux 3.X kernels spend 30% of CPU time in book keeping for the
invalidated pages as captured by CPU flame graphs.
fadvise DONT_NEED should never be called for files other than the commit log
segments.
https://github.com/apache/cassandra/blob/cassandra-2.1/src/java/org/apache/cassandra/io/util/RandomAccessReader.java#L168
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