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Posted to common-issues@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2011/03/08 08:34:59 UTC
[jira] Assigned: (HADOOP-7172) SecureIO should not check owner on
non-secure clusters that have no native support
[ https://issues.apache.org/jira/browse/HADOOP-7172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Todd Lipcon reassigned HADOOP-7172:
-----------------------------------
Assignee: Todd Lipcon
> SecureIO should not check owner on non-secure clusters that have no native support
> ----------------------------------------------------------------------------------
>
> 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
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 0.22.0
>
> Attachments: hadoop-7172.txt
>
>
> 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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