tree 3fc3aa91e5895b2208e40136535a9948767fd90a
parent 80f6d874cf415cc470eba96efeea52a87bb5d1f9
author ZHANG Dapeng <zdapeng@google.com> 1600300102 -0700
committer GitHub <noreply@github.com> 1600300102 -0700
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grpclb: cache requestConnection if no subchannel created

An issue was found during CBT RLS client testing: The RLS lb creates grplb child balancer, calls `grpclb.handleResolvedAddress()` then immediately calls `grpclb.requestConnection()`. The subchannel in `GrpclbState.currentPicker.pickList` contains only `GrpclbState.BUFFER_ENTRY` at the moment `grpclb.requestConnection()` is called, and therefore the `requestConnection()` is no-op, and RPC is hanging.