Christian Sailer deba96dce9 ENT-2991 Deadlock between AppendOnlyPersistentMap and underlying database ()
* Remove locks around database access in AppendOnlyPersistentMap and introduce
a unit test that checks that known deadlock scenarios of the old version
are avoided.

* Fix Deadlock unit test

* Add some extra latching to try and make timing less fragile.  Can never be perfect though.

* Review feedback, and some thread safety fixes.
2019-01-30 18:20:53 +00:00
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