Add support in native libs for OS buffer cache management
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Key: HADOOP-7714
URL: https://issues.apache.org/jira/browse/HADOOP-7714
Project: Hadoop Common
Issue Type: Bug
Components: native
Affects Versions: 0.24.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Especially in shared HBase/MR situations, management of the OS buffer cache is
important. Currently, running a big MR job will evict all of HBase's hot data
from cache, causing HBase performance to really suffer. However, caching of the
MR input/output is rarely useful, since the datasets tend to be larger than
cache and not re-read often enough that the cache is used. Having access to the
native calls {{posix_fadvise}} and {{sync_data_range}} on platforms where they
are supported would allow us to do a better job of managing this cache.
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