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phaneesh/restart-nn-ha.md

Created December 10, 2018 13:13
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Restart NameNode HA
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restart-nn-ha.md

Steps to restart NameNode HA with zero downtime

  • Failover to secondary namenode
$ sudo -u hdfs hdfs haadmin -failover nn1 nn2
  • Restart nn1 from Ambari
  • Failover again to secondary namenode
$ sudo -u hdfs hdfs haadmin -failover nn2 nn1
  • Restart nn2 from Ambari
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