Skywalking: io.grpc.StatusRuntimeException: UNAVAILABLE: io exception

[cookiejoo]

Please answer these questions before submitting your issue.

• Why do you submit this issue?
• [ ] Question or discussion

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Question

ERROR 2019-09-19 10:23:21:862 SkywalkingAgent-5-ServiceAndEndpointRegisterClient-0 ServiceAndEndpointRegisterClient : ServiceAndEndpointRegisterClient execute fail.
org.apache.skywalking.apm.dependencies.io.grpc.StatusRuntimeException: UNAVAILABLE: io exception
at org.apache.skywalking.apm.dependencies.io.grpc.stub.ClientCalls.toStatusRuntimeException(ClientCalls.java:222)
at org.apache.skywalking.apm.dependencies.io.grpc.stub.ClientCalls.getUnchecked(ClientCalls.java:203)
at org.apache.skywalking.apm.dependencies.io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:132)
at org.apache.skywalking.apm.network.register.v2.RegisterGrpc$RegisterBlockingStub.doServiceRegister(RegisterGrpc.java:386)
at org.apache.skywalking.apm.agent.core.remote.ServiceAndEndpointRegisterClient.run(ServiceAndEndpointRegisterClient.java:131)
at org.apache.skywalking.apm.util.RunnableWithExceptionProtection.run(RunnableWithExceptionProtection.java:36)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Connection timed out
at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
at sun.nio.ch.IOUtil.read(IOUtil.java:192)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
at org.apache.skywalking.apm.dependencies.io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:288)
at org.apache.skywalking.apm.dependencies.io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1108)
at org.apache.skywalking.apm.dependencies.io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:345)
at org.apache.skywalking.apm.dependencies.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:148)
at org.apache.skywalking.apm.dependencies.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:646)
at org.apache.skywalking.apm.dependencies.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:581)
at org.apache.skywalking.apm.dependencies.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:498)
at org.apache.skywalking.apm.dependencies.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:460)
at org.apache.skywalking.apm.dependencies.io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
at org.apache.skywalking.apm.dependencies.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
... 1 more

DEBUG 2019-09-19 10:23:21:863 SkywalkingAgent-5-ServiceAndEndpointRegisterClient-0 ServiceAndEndpointRegisterClient : ServiceAndEndpointRegisterClient running, status:DISCONNECT.
DEBUG 2019-09-19 10:23:21:863 SkywalkingAgent-5-ServiceAndEndpointRegisterClient-0 ServiceAndEndpointRegisterClient : ServiceAndEndpointRegisterClient running, status:DISCONNECT.

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Bug

• SkyWalking OAP6.3 - Agent 6.4
  2 CPU 4G Memory

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Requirement or improvement

• Please describe about your requirements or improvement suggestions.
  when i start-up my project, the skywalking log file print this sentence.
  how to salve this problem?

[wu-sheng]

This means the OAP server unreachable.

[cookiejoo]

but i have 5 project is already connect to OAP.
some project restart-up connect several times before it succeeds.

[wu-sheng]

This is the network issue. You have to check at your own env.

[Bhala1987]

Thought of sharing the useful info may be as even I was facing this same issue and able to resolve by simple addition:
Issue: io.grpc.StatusRuntimeException: UNAVAILABLE: io exception
Resolution: add the method 'withWaitForReady()' for invoking the service with client & request something like below:
_response= client.withWaitForReady().method(request);_