SecureIO should not check owner on non-secure clusters that have no native
support
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Key: HADOOP-7172
URL: https://issues.apache.org/jira/browse/HADOOP-7172
Project: Hadoop Common
Issue Type: Bug
Components: io, security
Affects Versions: 0.22.0
Reporter: Todd Lipcon
Priority: Critical
Fix For: 0.22.0
The SecureIOUtils.openForRead function currently uses a racy stat/open combo if
security is disabled and the native libraries are not available. This ends up
shelling out to "ls -ld" which is very very slow. We've seen this cause
significant performance regressions on clusters that match this profile.
Since the racy permissions check doesn't buy us any security anyway, we should
just fall back to a normal "open" without any stat() at all, if we can't use
the native support to do it efficiently.
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