After Upgrade to BDA V4.5/CDH 5.7.0 Clock Offset Alerts Like "The following health tests are bad: clock offset." are Raised.
Last updated on APRIL 29, 2018
Applies to:Big Data Appliance Integrated Software - Version 4.5.0 and later
After upgrade or at any other time unrelated to upgrade "clock offset" alerts are raised. The alerts look like:
Time: Oct 18, 2016 12:51:46 PM
View Details on bdanode0x.example.com
Monitor Startup: false
Role: NameNode (bdanode01)
Role Type: NameNode
Cluster Display Name: <cluster-name>
Service Display Name: hdfs
Service Type: HDFS
Health Test Results:
Health Test Name Event Code Severity Content
NAME_NODE_HOST_HEALTH Role health test bad Critical The health test result for NAME_NODE_HOST_HEALTH has become bad: The health of this role's host is bad. The following health tests are bad: clock offset.
1. The "ntpq -pn" stratum, delay, and offset values are concerning. The values seem to indicate that only one of the 3 NTP servers on the system is usable.
a) "ntpq -pn" from the node with "clock offset" alerts looks like:
a) /etc/ntp.conf looks ok on the cluster.
b) The ntpd daemons are all up. And ntpd daemon restart does not make any difference.
c) There is no clock drift on the cluster.
d) "dcli -C chkconfig --list ntpd" looks fine.
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