[Bug 1686679] Re: [SRU] Ubuntu16.04 : autofs takes extreamly long with large number of direct maps

[ChristianEhrhardt]

Hi Hua Zhang,
you asked me to look for a nomination for Xenial.
I quickly looked and while I ack on Xenial nomination I have a few extra requests.

1. the impact isn't clear are we talking seconds, minutes, hours - if
you could add a number from your tests that would be great

2. the testcase is rather unclear, imagine an SRU Team member that
actually wants to do this - that is a lot of work. I'm sure you have a
tst script that sets up those maps and such - please share and adapt
here accordingly.

3. regression potential is clearly not "no regression potential" there
could be misdetections not getting root ready, there could be issues due
to building the maps late. This is not about writing the nicest words to
say "no regression" it is about showing you really thought through the
regressions you expect might happen in case things go wrong or thre are
oversights in backporting.

4. what releases to fix
$ git tag --contains 67e7d613a4b09eeffc57ab44a7acb52027d897b2
release_5_1_2
$ rmadison autofs5
[...]
 autofs5 | 5.1.1-1ubuntu3   | xenial          | all
 autofs5 | 5.1.1-1ubuntu3   | yakkety         | all
 autofs5 | 5.1.2-1ubuntu1   | zesty           | all
 autofs5 | 5.1.2-1ubuntu1   | artful          | all
So IMHO Yakkety needs the fix as well, otherwise it will be a regression on upgrade.

5. the debdiff does not mention this bug number to let it be tracked by
LP when things move into proposed and updates, please add them

6. the patch in the debdiff had no dep3 header, but IMHO all pacthes should have one http://dep.debian.net/deps/dep3/
At least add bug, Author (you) and Forwarded with a pointer to the upstream patch

I'll try to nominate X&Y but let you do the further work to adapt SRU
template. Since I can't upload autofs you eventually need a core-dev
anyway, but I hope my quick check help to reduce the round trips you
need.

** Also affects: autofs5 (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Also affects: autofs5 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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Title:
  [SRU] Ubuntu16.04 : autofs takes extreamly long with large number of
  direct maps

Status in autofs5 package in Ubuntu:
  New
Status in autofs5 source package in Xenial:
  New
Status in autofs5 source package in Yakkety:
  New

Bug description:
  [Impact]

  autofs service in xenial takes extremely long time since its creating
  the directory hierarchy for all direct mounts maps, thus it will take
  too long to make all the automount shares available when using autofs
  with large direct mappings, customer is complaining about this point.
  So we need to backport the following upstream patch.

  https://git.kernel.org/pub/scm/linux/storage/autofs/autofs.git/commit/?id=67e7d613a4b09eeffc57ab44a7acb52027d897b2

  [Test Case]

   * Create an autofs direct mount map with large direct mappings (eg:
  more than 20k)

   * Start autofs service to see if it will take too much time to
  automount all mappings.

  [Regression Potential]

  With this upstream patch, we can avoid creating path compnents on
  remote file system unless that file system is the root file system. so
  theoretically there is no regression potential.

  [Other Info]
   
  Redhat [1] also already backported the following patch, see: https://bugzilla.redhat.com/show_bug.cgi?id=1440769

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