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CM5 hosts last signal was lost a few hours ago

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Pre:

1.CM5.11.

2.4 nodes, bigdatann1 is server and other is agent.

3.All node's firewall is running, but export 7180, 7182, 9995,9997,4433,7191,9000 port.

 

flowerbirds_1-1627468203020.png

HDFS,YARN,HIVE works well, but the hosts status display loss detection signal, Is it a host port problem?

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