grpclb: keep RR Subchannel state in TRANSIENT_FAILURE until becoming READY #7816
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…READY If all RR servers are unhealthy, it's possible that at least one connection is CONNECTING at every moment which causes RR to stay in CONNECTING. It's better to keep the TRANSIENT_FAILURE state in that case so that fail-fast RPCs can fail fast. The same changes have been made for RoundRobinLoadBalancer in grpc#6657
ejona86
approved these changes
Jan 15, 2021
voidzcy
reviewed
Mar 11, 2021
| // Switch subchannel1 to TRANSIENT_FAILURE, making the general state TRANSIENT_FAILURE too. | ||
| Status error = Status.UNAVAILABLE.withDescription("error1"); | ||
| deliverSubchannelState(subchannel1, ConnectivityStateInfo.forTransientFailure(error)); | ||
| inOrder.verify(helper).updateBalancingState(eq(TRANSIENT_FAILURE), pickerCaptor.capture()); |
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This test is weird. subchannel2 is still connecting, so the overall state should be CONNECTING. This is mostly because subchannels with CONNECTING state are ignored when aggregating the overall state.
So, observing TRANSIENT_FAILURE isn't related to your change. And I believe that should be fixed. However, for this test case specifically, you should bring all subchannels into TRANSIENT_FAILURE and then perform the test for behaviors related to your change.
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It looks like we should stop ignoring CONNECTING with this change (and use the same logic as RR and elsewhere)
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If all RR servers are unhealthy, it's possible that at least one
connection is CONNECTING at every moment which causes RR to stay in
CONNECTING. It's better to keep the TRANSIENT_FAILURE state in that
case so that fail-fast RPCs can fail fast.
The same changes have been made for RoundRobinLoadBalancer in #6657