cdh集群出现“无法发出查询:Host Monitor 未运行”
出现问题后,首先想到查看日志:
/var/log/cloudera-scm-server/cloudera-scm-server.log
2018-06-01 11:58:00,001 INFO 618348787@agentServer-2579:com.cloudera.server.common.MonitoringThreadPool: agentServer: waiting in queue stats: average=0ms, min=0ms, max=1ms.
2018-06-01 11:58:24,208 INFO ScmActive-0:com.cloudera.server.cmf.components.ScmActive: (119 skipped) ScmActive completed successfully.
2018-06-01 11:58:38,291 ERROR DatabaseSizeGauge-0:com.cloudera.enterprise.DatabaseSizeGauge: Failed to execute db size query.
java.lang.NullPointerException
at com.cloudera.enterprise.dbutil.DbUtil.getDatabaseSize(DbUtil.java:736)
at com.cloudera.enterprise.DatabaseSizeGauge.run(DatabaseSizeGauge.java:75)
at java.ut