1.x: fix ReplaySubject anomaly around caughtUp by removing that optimization#4051
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Current coverage is 80.49%@@ 1.x #4051 diff @@
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+ Hits 13244 13256 +12
+ Misses 2341 2331 -10
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This was referenced Jun 30, 2016
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Adding the backpressure support to
ReplaySubjectexposed a race condition around thecaughtUpoptimization.The problem occurs when the source thread has caught up after
drain()returned true but at the same time, a concurrentdrain()starts running (due to a subscribe() process finishing or requesting on top of the previousLong.MAX_VALUE). This concurrent drain may think the replay hasn't started yet (by findingrp.nodenull) or seeing that the buffer has more elements (that may get double emitted).The current solution is to remove this optimization until we come up with a correct optimization.
Related: #4028.