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From Omid Aladini <omidalad...@gmail.com>
Subject Off-heap row cache and mmapped sstables
Date Thu, 12 Apr 2012 16:15:59 GMT
Hi,

Cassandra issues an mlockall [1] before mmap-ing sstables to prevent
the kernel from paging out heap space in favor of memory-mapped
sstables. I was wondering, what happens to the off-heap row cache
(saved or unsaved)? Is it possible that the kernel pages out off-heap
row cache in favor of resident mmap-ed sstable pages?

Thanks,
Omid

[1] http://pubs.opengroup.org/onlinepubs/007908799/xsh/mlockall.html

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