CDH前端CM监控不正常（未解决）
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- Unable to issue query: the Host Monitor is not running
检查event server 日志
[root@ip-xxx cloudera-scm-eventserver]# pwd
/var/log/cloudera-scm-eventserver
[root@ip-xxx cloudera-scm-eventserver]# tail -f -n 1000 mgmt-cmf-mgmt-EVENTSERVER-ip-xxx.out日志显示
2018-06-14 22:01:34,393 INFO com.cloudera.enterprise.ssl.SSLFactory: Using configured truststore for verification of server certificates in HTTPS communication.
2018-06-14 22:01:34,814 INFO com.cloudera.cmf.BasicScmProxy: Using encrypted credentials for SCM
2018-06-14 22:01:34,906 INFO com.cloudera.cmf.BasicScmProxy: Authenticated to SCM.
2018-06-14 22:01:34,919 INFO com.cloudera.cmf.BasicScmProxy: Authentication to SCM required.
2018-06-14 22:01:34,919 WARN com.cloudera.cmf.eventcatcher.server.EventCatcherService: No descriptor fetched from https://xxx:7183 on after 1 tries, sleeping...
2018-06-14 22:01:36,990 INFO com.cloudera.cmf.BasicScmProxy: Using encrypted credentials for SCM
2018-06-14 22:01:37,092 INFO com.cloudera.cmf.BasicScmProxy: Authenticated to SCM.
2018-06-14 22:01:37,102 INFO com.cloudera.cmf.BasicScmProxy: Authentication to SCM required.
2018-06-14 22:01:37,102 WARN com.cloudera.cmf.eventcatcher.server.EventCatcherService: No descriptor fetched from https://xxx:7183 on after 2 tries, sleeping...
2018-06-14 22:01:39,169 INFO com.cloudera.cmf.BasicScmProxy: Using encrypted credentials for SCM
2018-06-14 22:01:39,255 INFO com.cloudera.cmf.BasicScmProxy: Authenticated to SCM.
2018-06-14 22:01:39,264 INFO com.cloudera.cmf.BasicScmProxy: Authentication to SCM required.
2018-06-14 22:01:39,264 WARN com.cloudera.cmf.eventcatcher.server.EventCatcherService: No descriptor fetched from https://xxx:7183 on after 3 tries, sleeping...
2018-06-14 22:01:41,340 INFO com.cloudera.cmf.BasicScmProxy: Using encrypted credentials for SCM
2018-06-14 22:01:41,437 INFO com.cloudera.cmf.BasicScmProxy: Authenticated to SCM.
2018-06-14 22:01:41,446 INFO com.cloudera.cmf.BasicScmProxy: Authentication to SCM required.
2018-06-14 22:01:41,447 WARN com.cloudera.cmf.eventcatcher.server.EventCatcherService: No descriptor fetched from https://xxx:7183 on after 4 tries, sleeping...
2018-06-14 22:01:43,512 INFO com.cloudera.cmf.BasicScmProxy: Using encrypted credentials for SCM
2018-06-14 22:01:43,606 INFO com.cloudera.cmf.BasicScmProxy: Authenticated to SCM.
2018-06-14 22:01:43,619 INFO com.cloudera.cmf.BasicScmProxy: Authentication to SCM required.
2018-06-14 22:01:43,619 WARN com.cloudera.cmf.eventcatcher.server.EventCatcherService: No descriptor fetched from https://ip-172-31-2-173.cn-north-1.compute.internal:7183 on after 5 tries, sleeping...
2018-06-14 22:01:45,620 ERROR com.cloudera.cmf.eventcatcher.server.EventCatcherService: Could not fetch descriptor after 5 tries, exiting.原因是我们使用的企业版的license过期，导致Cloudera Navigator不能使用，我们在TLS这里设置的等级涉及到收费功能，license过期导致不生效。
来源：oschina
链接：https://my.oschina.net/u/4289314/blog/3936311