[Bug 1894453] Please test proposed package

[Corey Bryant]

Hello Ponnuvel, or anyone else affected,

Accepted ceph into train-proposed. The package will build now and be
available in the Ubuntu Cloud Archive in a few hours, and then in the
-proposed repository.

Please help us by testing this new package. To enable the -proposed
repository:

  sudo add-apt-repository cloud-archive:train-proposed
  sudo apt-get update

Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-train-needed to verification-train-done. If it does
not fix the bug for you, please add a comment stating that, and change
the tag to verification-train-failed. In either case, details of your
testing will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!

** Changed in: cloud-archive/train
       Status: Triaged => Fix Committed

** Tags added: verification-train-needed

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https://bugs.launchpad.net/bugs/1894453

Title:
  Building Ceph packages with RelWithDebInfo

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive queens series:
  Triaged
Status in Ubuntu Cloud Archive stein series:
  Fix Committed
Status in Ubuntu Cloud Archive train series:
  Fix Committed
Status in Ubuntu Cloud Archive ussuri series:
  Fix Committed
Status in ceph package in Ubuntu:
  Fix Released
Status in ceph source package in Bionic:
  Triaged
Status in ceph source package in Focal:
  Fix Committed

Bug description:
  [Impact]
  This is to build the Ceph packages (UCA) with 'RelWithDebInfo' build option (CMAKE_BUILD_TYPE [0]) which can be supplied to the build script do_cmake.sh [0]. 

  Currently, UCA builds default to 'Debug' [1] builds. The UCA's build process does debug build just for the rocksdb component - because the upstream builds (CMakeLists.txt) left it to individual projects using rocksdb. So UCA's build used the default (debug build). Upstream has since
  updated this to do release build (with RelWithDebInfo option) [2].

  In general, gcc's -O2 [3] (which will be enabled by RelWithDebInfo)
  build should generate better code as well as there's a specific case
  for Ceph [4] that it improves performance.

  Building rocksdb with optimizations enabled improves the performance and
  rocksdb being an important part of OSD and MON components of Ceph, this
  enables better performance of Ceph cluster. Comments #17, #18, & #19
  show relevant test results.

  [Test Case]
  Standard ceph-backed OpenStack regression will be run, consisting of juju-deployed OpenStack+ceph and tempest regression testing against the deployment.

  [Regression Potential]
  As Ponnuvel mentioned, the size of binaries will be slightly bigger and also the build/compilation will be longer.

  There are no upstream bugs for this. rocksdb is one of the submodules
  in Ceph and how each of the submodule gets built is left to end-users.
  The bug [5] where this change was done in upstream is not relevant
  directly; this change was done as part of a different bug fix.

  [0] https://github.com/ceph/ceph/blob/master/do_cmake.sh

  [1] https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html

  [2] https://github.com/facebook/rocksdb/pull/5916

  [3] https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html

  [4] https://bugs.gentoo.org/show_bug.cgi?id=733316

  [5] https://github.com/facebook/rocksdb/issues/2445

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