disable atime for DirectIOLinuxDirectory
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Key: LUCENE-2787
URL: https://issues.apache.org/jira/browse/LUCENE-2787
Project: Lucene - Java
Issue Type: Improvement
Components: contrib/*
Reporter: Robert Muir
Fix For: 3.1, 4.0
In Linux's open():
O_NOATIME
(Since Linux 2.6.8) Do not update the file last access time (st_atime in
the inode) when the file is read(2). This flag is intended for use by indexing
or backup programs, where its use can significantly reduce the amount of disk
activity. This flag may not be effective on all filesystems. One example is
NFS, where the server maintains the access time.
So we should do this in our linux-specific DirectIOLinuxDirectory.
Separately (offtopic), it would be better if this was a LinuxDirectory that
only uses O_DIRECT when it should :)
It would be nice to think about an optional modules/native for common platforms
similar to what tomcat provides
Its easier to test directories like this now (-Dtests.directory)...
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