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Operating System:
ALL
Steps To Reproduce:
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1) 3 member repl set (nothing special)
2) mongo shell to primary
3) rs.status()
4)

db.foo.insert( { x: 1 }, { writeConcern: { w: "majority", wtimeout: 2000 } } )

was successful
5) c=rs.conf()
6) c.protocolVersion=0
7) rs.reconfig(c)
8) c=rs.status()
9) c=rs.conf()
10) c.protocolVersion=1
11) rs.reconfig(c)
12) rs.status()
13)

db.foo.insert( { x: 1 }, { writeConcern: { w: "majority", wtimeout: 2000 } } )

returns

WriteResult({ "nInserted" : 1, "writeConcernError" : { "code" : 64, "codeName" : "WriteConcernFailed", "errInfo" : { "wtimeout" : true }, "errmsg" : "waiting for replication timed out" } })
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1) 3 member repl set (nothing special) 2) mongo shell to primary 3) rs.status() 4) db.foo.insert( { x: 1 }, { writeConcern: { w: "majority" , wtimeout: 2000 } } ) was successful 5) c=rs.conf() 6) c.protocolVersion=0 7) rs.reconfig(c) 8) c=rs.status() 9) c=rs.conf() 10) c.protocolVersion=1 11) rs.reconfig(c) 12) rs.status() 13) db.foo.insert( { x: 1 }, { writeConcern: { w: "majority" , wtimeout: 2000 } } ) returns WriteResult({ "nInserted" : 1, "writeConcernError" : { "code" : 64, "codeName" : "WriteConcernFailed" , "errInfo" : { "wtimeout" : true }, "errmsg" : "waiting for replication timed out" } })
Sprint:
Repl 2017-02-13
Confidence Status:
None
Work Order:
3

with pv1, I first did

db.foo.insert( { x: 1 }, { writeConcern: { w: "majority", wtimeout: 2000 } } )

and was successful.
Then I reconfig'ed to pv0 and rs.status to see what that returned.
I reconfig'ed back to pv1 and I can no longer do

db.foo.insert( { x: 1 }, { writeConcern: { w: "majority", wtimeout: 2000 } } )

*note* I didn't change writeConcernMajorityJournalDefault during any of my shenanigans.