** No longer affects: juju-mongodb3.2 (Ubuntu Xenial)

** No longer affects: juju-mongodb3.2 (Ubuntu Yakkety)

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https://bugs.launchpad.net/bugs/1670891

Title:
  MongoDB used by Juju has replication bug

Status in juju:
  In Progress
Status in juju-mongodb3.2 package in Ubuntu:
  Fix Released

Bug description:
  IS are seeing frequent MongoDB failures like this:

  Mar  7 21:26:41 juju-4da59b22-9710-4e69-840a-be49ee864a97-machine-2 
mongod.37017[5180]: [NetworkInterfaceASIO-BGSync-0] Successfully connected to 
10.25.2.111:37017
  <pjdc> Mar  7 21:26:41 juju-4da59b22-9710-4e69-840a-be49ee864a97-machine-2 
mongod.37017[5180]: [rsBackgroundSync] Starting rollback due to 
OplogStartMissing: our last op time fetched: (term: 279, timestamp: Mar  7 
20:20:47:2b). source's GTE: (term: 280, timestamp: Mar  7 20:21:19:1) hashes: 
(6725952777685747593/-748731992779411949)
  Mar  7 21:26:41 juju-4da59b22-9710-4e69-840a-be49ee864a97-machine-2 
mongod.37017[5180]: [rsBackgroundSync] Fatal assertion 18750 
UnrecoverableRollbackError: need to rollback, but in inconsistent state. 
minvalid: (term: 280, timestamp: Mar  7 20:21:22:4) > our last optime: (term: 
279, timestamp: Mar  7 20:20:47:2b)
  Mar  7 21:26:41 juju-4da59b22-9710-4e69-840a-be49ee864a97-machine-2 
mongod.37017[5180]: [rsBackgroundSync] #012#012***aborting after fassert() 
failure

  Some research reveals that this is the likely fix:
  https://jira.mongodb.org/browse/SERVER-7200

  The fix is in MongoDB 3.2.11 but the juju-mongodb package is based
  around 3.2.9. The current latest 3.2 is 3.2.12 so I suggested we
  upgrade the package to that.

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