gRPC occasionally appears abnormal

[李灵韬]

I recently added grpc to my app, but it occasionally reports errors, which cannot be reproduced stably.

Console output:

java.util.concurrent.ExecutionException: io.grpc.StatusRuntimeException: UNAVAILABLE: io exception

at com.google.common.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:566)

at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:547)

My client uses Java, the server uses Python, and the grpc version is 1.36.0

[李灵韬]

Do I need to provide more information?

[李灵韬]

Caused by: io.grpc.netty.shaded.io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: no further information: /127.0.0.1:50051

Caused by: java.net.ConnectException: Connection refused: no further information

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect(Unknown Source)

at io.grpc.netty.shaded.io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330)

at io.grpc.netty.shaded.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334)

at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:702)

at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)

at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)

at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)

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(Unknown Source)

[Lidi Zheng]

Hi,

UNAVAILABLE is one of the gRPC status codes, like 503 in HTTP status code. You can read more about the gRPC status code at https://github.com/grpc/grpc/blob/master/doc/statuscodes.md.

What you are experiencing could have many different causes. I would recommend tuning up the Java client's log verbosity to see what exactly is failing the connection.

Lidi Zheng

On Mon, Jun 14, 2021 at 11:56 PM 李灵韬 <lilts...@gmail.com> wrote:

I changed my code 

ManagedChannelBuilder.forAddress("localhost", port).usePlaintext().build(); 

to 

ManagedChannelBuilder.forAddress("localhost", port).forAddress("127.0.0.1", port).usePlaintext().build();

, this seems to succeed, no errors occurred, very strange

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