When configuring Hadoop for analytics in Pseudo Distributed/Distributed mode the datanode is failing to start up. (Doc ID 1425774.1)

Last updated on NOVEMBER 03, 2016

Applies to:

Oracle WebCenter Sites - Version 2.5 to 2.5.1 [Release FatWire]
Information in this document applies to any platform.

Symptoms

When configuring Hadoop for analytics in Pseudo Distributed/Distributed mode the datanode is failing to start up and gives the following exception:

ERROR org.apache.hadoop.dfs.DataNode: java.io.IOException: Incompatible namespaceIDs in /home/hadoop/dfs/data: namenode namespaceID = ; datanode namespaceID =
at org.apache.hadoop.dfs.DataStorage.doTransition(DataStorage.java:226)
at .....

This causes the Analytics jobs to fail since the hadoop jobs and hdfs agent fail to to start.

Cause

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