What are active and passive “NameNodes” in Hadoop?

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I am bit confused about the above terms, can you please help me know these terms.
Dec 13, 2018 in Big Data Hadoop by Neha
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In HA (High Availability) architecture, we have two NameNodes – Active “NameNode” and Passive “NameNode”.

  • Active “NameNode” is the “NameNode” which works and runs in the cluster.
  • Passive “NameNode” is a standby “NameNode”, which has similar data as active “NameNode”.

When the active “NameNode” fails, the passive “NameNode” replaces the active “NameNode” in the cluster. Hence, the cluster is never without a “NameNode” and so it never fails.

answered Dec 13, 2018 by Frankie
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