Community Articles
Find and share helpful community-sourced technical articles
Announcements
Alert: Welcome to the Unified Cloudera Community. Former HCC members be sure to read and learn how to activate your account here.

SYMPTOM: HDP upgrade was failed on HDFS startup. Namenode was not able to start and below were log messages -

ERROR:

10649-screen-shot-2016-12-22-at-121416-am.png

From the detailed logs we see below error -

10651-screen-shot-2016-12-22-at-121747-am.png

ROOT CAUSE: The above log clearly indicates"ClassNotFound" error. Customer has integrated customer jar in hadoop which was causing the issue.

RESOLUTION: There was custom jar which was already in place with Previous HDP version [located in path -

/usr/hdp/2.4.3.0-37/hadoop/sas*.jar ]. Adding the jar from earlier version to the upgraded version path [ie. /usr/hdp/2.5.3.0-37/hadoop/] resolved the issue.

[Note: There was custom implementation of SAS with hadoop for the setup and hence the custom jars were present in path mentioned above ie. /usr/hdp/2.4.3.0-37/hadoop/sas*.jar. Default setup never includes any custom app/jar implementation with hadoop. It usually refers or org.apache.hadoop class.]

105 Views
Don't have an account?
Coming from Hortonworks? Activate your account here
Version history
Revision #:
2 of 2
Last update:
‎08-17-2019 07:10 AM
Updated by:
 
Contributors
Top Kudoed Authors