Backport/william/v4.2.12 #4732
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Backport/william/v4.2.12 #4732
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Use global lock to reduce remote lock overhead. So that emqx route trans can run in dirty *sync* context. At least 10X subscribe/unsubscribe improvments.
So change broker call timeout to infinity.
intro. new lock type: 'spawn' of broker.perf.route_lock_type mnesia get lock calls are not optimized for selective receive. hence taking locks would be very expensive while there are tones of messages in the brokers message queue. This optimization run the transaction in a separate process to utilize the selective receive optimization of the compiler.
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It is meaningless to do elvis checks on maintenance branches.
zmstone
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backport fixes to 4.2 for the following issues:
#2671
#2985
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