[Bug 613662] Update Released
Colin Watson
cjwatson at canonical.com
Tue Apr 23 15:36:00 UTC 2013
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https://bugs.launchpad.net/bugs/613662
Title:
nscd doesn't cache host entries
Status in “eglibc” package in Ubuntu:
Fix Released
Status in “eglibc” source package in Precise:
Fix Released
Status in “eglibc” source package in Quantal:
Fix Released
Bug description:
[Impact / Justification]
For nscd users, the performance difference between a cached DNS lookup and a remote query can be anywhere from milliseconds to whole seconds, depending on the network and random luck. I've already verified here today that the concerns originally raised in the upstream bug have since been fixed, and Debian also dropped this patch a while ago, we just failed to sync with them when they did.
[Test Case]
As stated above, I've already tested that the actual root issue that led to the patch has been resolved, so the only thing to test is that the build binaries no longer have host caching disabled in the default /etc/nscd.conf
[Regression Potential]
Very low to non-existent. It's a single line change to a conffile, reverting a workaround that hasn't been needed in a long while.
[Original Report]
Binary package hint: nscd
Debian (and by implication Ubuntu) are the only distros to disable
nscd hosts caching. In most cases, it is deployed with the expectation
to mitigate expensive lookups (eg over VPN).
The bug cited [1] has been rejected by the core glibc developers three
years ago as not a bug; all other distros (including Redhat EL and
Novell SLES) have this functionality enabled. Why should we continue
to penalise Ubuntu's performance any longer, in cases where nscd is
deployed to improve performance?
[1] http://sourceware.org/bugzilla/show_bug.cgi?id=4428
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