java interop to prod interop tests are failing on master

[jtattermusch]

https://source.cloud.google.com/results/invocations/283ada17-044e-4a2e-a8ee-08deacf0617a/targets/github%2Fgrpc%2Finterop_test/tests

unning test large_unary
Exception in thread "main" io.grpc.StatusRuntimeException: UNAVAILABLE: io exception
	at io.grpc.stub.ClientCalls.toStatusRuntimeException(ClientCalls.java:262)
	at io.grpc.stub.ClientCalls.getUnchecked(ClientCalls.java:243)
	at io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:156)
	at io.grpc.testing.integration.TestServiceGrpc$TestServiceBlockingStub.unaryCall(TestServiceGrpc.java:624)
	at io.grpc.testing.integration.AbstractInteropTest.largeUnary(AbstractInteropTest.java:447)
	at io.grpc.testing.integration.TestServiceClient.runTest(TestServiceClient.java:228)
	at io.grpc.testing.integration.TestServiceClient.run(TestServiceClient.java:207)
	at io.grpc.testing.integration.TestServiceClient.main(TestServiceClient.java:65)
Caused by: io.grpc.netty.shaded.io.netty.channel.AbstractChannel$AnnotatedNoRouteToHostException: null: grpc-test4.sandbox.googleapis.com/2607:f8b0:400c:c12:0:0:0:451:443
Caused by: java.net.NoRouteToHostException
	at io.grpc.netty.shaded.io.netty.channel.unix.Errors.throwConnectException(Errors.java:116)
	at io.grpc.netty.shaded.io.netty.channel.unix.Socket.connect(Socket.java:239)
	at io.grpc.netty.shaded.io.netty.channel.epoll.AbstractEpollChannel.doConnect0(AbstractEpollChannel.java:735)
	at io.grpc.netty.shaded.io.netty.channel.epoll.AbstractEpollChannel.doConnect(AbstractEpollChannel.java:720)
	at io.grpc.netty.shaded.io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.connect(AbstractEpollChannel.java:562)
	at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.connect(DefaultChannelPipeline.java:1342)
	at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:548)
	at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.connect(AbstractChannelHandlerContext.java:533)
	at io.grpc.netty.shaded.io.netty.channel.ChannelDuplexHandler.connect(ChannelDuplexHandler.java:54)
	at io.grpc.netty.shaded.io.grpc.netty.WriteBufferingAndExceptionHandler.connect(WriteBufferingAndExceptionHandler.java:150)
	at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:548)
	at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.access$1000(AbstractChannelHandlerContext.java:61)
	at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext$9.run(AbstractChannelHandlerContext.java:538)
	at io.grpc.netty.shaded.io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
	at io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
	at io.grpc.netty.shaded.io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:387)
	at io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
	at io.grpc.netty.shaded.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.grpc.netty.shaded.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.lang.Thread.run(Thread.java:748)

[jtattermusch]

CC @apolcyn as the current build nurse.

[ericgribkoff]

@voidzcy I think this is the issue that will be resolved by #7818

[voidzcy]

Closing as the tests have been passing again with the fix merged.

https://fusion.corp.google.com/projectanalysis/summary/KOKORO/prod:grpc%2Fcore%2Fmaster%2Flinux%2Fgrpc_interop_toprod?search_pattern=grpc.*nterop&include_inactive_projects=false