be.WARNING.log 日志如下：
failed to report TASK|host=172.50.80.2|port=9020|error=Internal error: Fail to get master client from cache。
fe.warn.log 如下：
get bad heartbeat response: type: BACKEND, status: BAD, msg: java.net.ConnectException: Connection refused (Connection refused), beId: 10003, beHost: 172.50.80.3, bePort: 0, httpPort: 0, brpcPort: 0
2023-04-24 02:22:14,591 WARN (heartbeat-mgr-pool-3|213) [HeartbeatMgr$BackendHeartbeatHandler.call():268] backend heartbeat got exception
org.apache.thrift.transport.TTransportException: java.net.ConnectException: Connection refused (Connection refused)
at org.apache.thrift.transport.TSocket.open(TSocket.java:226) ~[libthrift-0.13.0.jar:0.13.0]
at org.apache.doris.common.GenericPool$ThriftClientFactory.create(GenericPool.java:143) ~[doris-fe.jar:1.2-SNAPSHOT]
at org.apache.doris.common.GenericPool$ThriftClientFactory.create(GenericPool.java:126) ~[doris-fe.jar:1.2-SNAPSHOT]
at org.apache.commons.pool2.BaseKeyedPooledObjectFactory.makeObject(BaseKeyedPooledObjectFactory.java:62) ~[commons-pool2-2.2.jar:2.2]
at org.apache.commons.pool2.impl.GenericKeyedObjectPool.create(GenericKeyedObjectPool.java:1012) ~[commons-pool2-2.2.jar:2.2]
at org.apache.commons.pool2.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:356) ~[commons-pool2-2.2.jar:2.2]
at org.apache.commons.pool2.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:277) ~[commons-pool2-2.2.jar:2.2]
at org.apache.doris.common.GenericPool.borrowObject(GenericPool.java:95) ~[doris-fe.jar:1.2-SNAPSHOT]
at org.apache.doris.system.HeartbeatMgr$BackendHeartbeatHandler.call(HeartbeatMgr.java:225) ~[doris-fe.jar:1.2-SNAPSHOT]
at org.apache.doris.system.HeartbeatMgr$BackendHeartbeatHandler.call(HeartbeatMgr.java:203) ~[doris-fe.jar:1.2-SNAPSHOT]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_342]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_342]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_342]
at java.lang.Thread.run(Thread.java:750) ~[?:1.8.0_342]
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method) ~[?:1.8.0_342]
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[?:1.8.0_342]
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[?:1.8.0_342]
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[?:1.8.0_342]
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[?:1.8.0_342]
at java.net.Socket.connect(Socket.java:607) ~[?:1.8.0_342]
at org.apache.thrift.transport.TSocket.open(TSocket.java:221) ~[libthrift-0.13.0.jar:0.13.0]
… 13 more
应该是be 和 fe 之间通信的网络问题，检查一下端口是不是通的
