[Bug 1953426] Re: [SRU] configurable threshold for reaping dead connections and add a unit test

[Ubuntu Foundations Team Bug Bot]

The attachment "0001-msg-async-configurable-threshold-for-reaping-dead-
co.patch" seems to be a patch.  If it isn't, please remove the "patch"
flag from the attachment, remove the "patch" tag, and if you are a
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** Tags added: patch

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https://bugs.launchpad.net/bugs/1953426

Title:
  [SRU] configurable threshold for reaping dead connections and add a
  unit test

Status in ceph package in Ubuntu:
  In Progress
Status in ceph source package in Focal:
  In Progress

Bug description:
  [Impact]
  add a configurable threshold for reaping dead connections and fix cephfs test case

  
  [Test case]
  run ceph qa tests in: qa/tasks/cephfs/test_sessionmap.py
  this also verifies the configurable threshold

  steps to run:
  1. build ceph from source folder
  2. go to build folder
  3. run all tests in test_sessionmap.py, e.g.
  python ../qa/tasks/vstart_runner.py tasks.cephfs.test_sessionmap.TestSessionMap.test_mount_conn_close
  python ../qa/tasks/vstart_runner.py tasks.cephfs.test_sessionmap.TestSessionMap.test_tell_session_drop
  ...

  
  [Regression potential]
  only add a configuration, no regression potential

  [Additional information]
  from upstream:
  octopus backport tracker
  https://tracker.ceph.com/issues/51199

  octopus backport PR
  https://github.com/ceph/ceph/pull/43310

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