Limit resolving concurrency #4
Merged
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After updating grpc version to latest,
ResolveNowis called when connection is closing.It can cause a lot of cloudmap calls when networking issue : for example, all of target close connection when rollout with blue-green strategy.
To avoid this problem, this PR changes resolving cloudmap to critical section to allow only one thread to call cloud map, and early-return other threads until it is done.