DataNode: Incompatible namespaceIDs

Error


DataNode: java.io.IOException: Incompatible namespaceIDs

The issue is related to JIRA https://issues.apache.org/jira/browse/HDFS-107 , it comes when we format the namenode but the data directory of datanodes is still having the old references and namespace IDs

When you format the namenode you have to take care of data directories

  • Either remove its content
  • or decide on new place for datanode directories


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