Apache Ambari Operations
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Verify the HDFS Components

Before starting HDFS, verify that you have the correct components:

  1. Go to Ambari Web UI > Services; then select HDFS.

  2. Check the Summary panel and ensure that the first three lines look like this:

    • NameNode

    • SNameNode

    • DataNodes

    You should not see a line for JournalNodes.