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



From the detailed logs we see below error -


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/*.jar ]. Adding the jar from earlier version to the upgraded version path [ie. /usr/hdp/] 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/*.jar. Default setup never includes any custom app/jar implementation with hadoop. It usually refers or org.apache.hadoop class.]

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Last update:
‎08-17-2019 07:10 AM
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