reference:
https://www.cnblogs.com/barneywill/p/10400788.html
CM error Canary Canary
1 HDFS Canary
Canary test can not create a parent directory for /tmp/.cloudera_health_monitoring_canary_files.Hive Canary Metastore 2
Hive Metastore Canary create a hue hdfs home directory failed.
an examination:
1) hdfs is in safemode, normal is off
# hdfs dfsadmin -safemode get
Safe mode is OFF
2) hdfs datanode is healthy, disk space is free, you can upload their own files test
# hdfs dfsadmin -report
3) based on error view directory permissions, if there are problems, to 777
# hdfs dfs -ls /tmp
d--------- - hdfs supergroup 0 2019-02-18 23:57 /tmp/.cloudera_health_monitoring_canary_files
# hdfs dfs -chmod 777 /tmp/.cloudera_health_monitoring_canary_files