Ⅰ. Issue Description

seata-server使用etcd3 进行服务注册在保活因网络问题触发IOException后没有进行重试而是直接退出保活流程使得网络问题恢复后 seata无法自动恢复服务

Ⅱ. Describe what happened

保活异常后没有重试使得etcd中不在存在这个节点网络恢复后依然不能自动恢复保活
2021-04-27 02:44:09.251 ERROR --- [ registry-etcd3_1_1_2] i.s.d.r.etcd3.EtcdRegistryServiceImpl : EtcdLifeKeeper==> java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: io.grpc.StatusRuntimeException: UNAVAILABLE: io exception
at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895)
at io.seata.discovery.registry.etcd3.EtcdRegistryServiceImpl$EtcdLifeKeeper.process(EtcdRegistryServiceImpl.java:342)
at io.seata.discovery.registry.etcd3.EtcdRegistryServiceImpl$EtcdLifeKeeper.call(EtcdRegistryServiceImpl.java:366)
at io.seata.discovery.registry.etcd3.EtcdRegistryServiceImpl$EtcdLifeKeeper.call(EtcdRegistryServiceImpl.java:322)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.util.concurrent.ExecutionException: io.grpc.StatusRuntimeException: UNAVAILABLE: io exception
at com.google.common.util.concurrent.AbstractFuture.getDoneValue(AbstractFuture.java:552)
at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:533)
at io.etcd.jetcd.Util.lambda$toCompletableFutureWithRetry$2(Util.java:140)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
... 1 common frames omitted
Caused by: io.grpc.StatusRuntimeException: UNAVAILABLE: io exception
at io.grpc.Status.asRuntimeException(Status.java:530)
at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:482)
at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
at io.etcd.jetcd.ClientConnectionManager$AuthTokenInterceptor$1$1.onClose(ClientConnectionManager.java:302)
at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
at io.grpc.internal.CensusStatsModule$StatsClientInterceptor$1$1.onClose(CensusStatsModule.java:694)
at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
at io.grpc.internal.CensusTracingModule$TracingClientInterceptor$1$1.onClose(CensusTracingModule.java:397)
at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:459)
at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:63)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:546)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$600(ClientCallImpl.java:467)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:584)
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
... 3 common frames omitted
Caused by: java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
at sun.nio.ch.IOUtil.read(IOUtil.java:192)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
at io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:288)
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1128)
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:347)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:148)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:644)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:579)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:496)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:458)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:897)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
... 1 common frames omitted

Just paste your stack trace here!

Ⅲ. Describe what you expected to happen

异常出现后自动重试保活网络恢复后能够自动恢复保活

Ⅳ. How to reproduce it (as minimally and precisely as possible)

使用etcd3作为服务发现启动seata-server
触发网络问题使得seata-server无法正常访问etcd
一段时间之后恢复网络此时seata-server依然不进行保活问题触发

Ⅴ. Anything else we need to know?

io.seata.discovery.registry.etcd3.EtcdRegistryServiceImpl.EtcdLifeKeeper#process
这里throw Exception造成的问题吃掉这个异常应该就可以得到期望行为
补充实际测试发现吃掉异常并没解决问题还在继续排查有新结论时再同步
补充2 排查发现断联超时后 etcd会删除deata-server注册上的key 造成即使吃掉这个异常接下来的保活依然无效因为key已经没了需要重新注册而不是保活