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

[gerald.yang]

** Description changed:

  [Impact]
  add a configurable threshold for reaping dead connections and fix cephfs test case
  
- 
- [Test case]
+ [Test plan]
  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
  ...
  
+ [Where problems could occur]
+ None, only add a configuration and also be tested by ceph qa tests
  
- [Regression potential]
- only add a configuration, no regression potential
- 
- [Additional information]
+ [Other info]
  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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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 plan]
  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
  ...

  [Where problems could occur]
  None, only add a configuration and also be tested by ceph qa tests

  [Other info]
  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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