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GRADLE_OPTS=-Xmx512m LDFLAGS=-L/tmp/protobuf/lib CXXFLAGS=-I/tmp/protobuf/include LD_LIBRARY_PATH=/tmp/protobuf/lib

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grpclb: include fallback reason in error status of failing to fallback (#8035)

Enhance error information reflected by RPC status when failing to fallback (aka, no fallback addresses provided by resolver), by including the original cause of entering fallback. Cases to fallback include:

  - When the fallback timer fires before we have received the first response from the balancer.
     - If no fallback addresses are found, RPCs will be failed with status {UNAVAILABLE, description="Unable to fallback, no fallback addresses found\n Timeout waiting for remote balancer", cause=null}
  - When the balancer RPC finishes before receiving any backend addresses
     - If no fallback addresses are found, RPCs will be failed with status {UNAVAILABLE, description="Unable to fallback, no fallback addresses found\n <description from the status of balancer RPC>", cause=<cause from the status of balancer RPC>}
  - When we get an explicit response from the balancer telling us go into fallback
     - If no fallback addresses are found, RPCs will be failed with status {UNAVAILABLE, description="Unable to fallback, no fallback addresses found\n Fallback requested by balancer", cause=null}
  - When the balancer call has finished *and* we cannot connect to any of the backends in the last response we received from the balancer.
     - Depending on whichever the two happened last, the last happening one is the reason that triggers entering fallback. If no fallback addresses are found, RPCs will be failed with status {UNAVAILABLE, description="Unable to fallback, no fallback addresses found\n <description from the status of balancer RPC>", cause=<cause from the status of balancer RPC>} or {UNAVAILABLE, description="Unable to fallback, no fallback addresses found\n <description from the status of one of the broken subchannels>", cause=<cause from the status of one of the broken subchannels>}

Note all RPCs will fail with UNAVAILABLE status code, the fallback reason w... (continued)

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Source Files on job 21856.1 (GRADLE_OPTS=-Xmx512m LDFLAGS=-L/tmp/protobuf/lib CXXFLAGS=-I/tmp/protobuf/include LD_LIBRARY_PATH=/tmp/protobuf/lib)