[ https://issues.apache.org/jira/browse/CASSANDRA-7938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
T Jake Luciani updated CASSANDRA-7938: -------------------------------------- Attachment: 7938.txt Patch to ignore fadvise calls with -Dcassandra.ignore.fadvise=true > Releases prior to 2.0 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 > Fix For: 1.2.19 > > Attachments: 7938.txt > > > RandomAccessReader gratuitously invalidates the buffer cache in releases > prior to 2.0. > 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 -- This message was sent by Atlassian JIRA (v6.3.4#6332)