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Possible reasons that cause slow name node (NN)

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Our customer has a HA-enabled cluster, and after automatic failover, the active name node (NN) is very slow. This is a central place for collecting all possible reasons that cause slow NN.

Problem definition:

  1. NN is responding slowly. It does not crash. Most of the operations can succeed.
  2. By slow, I have two proofs a) hdfs dfs -ls / command is sluggy b) From JMX metrics, average RPC process time is up to 3~10 seconds

For answers, please kindly list the possible reason along with solutions.

1 ACCEPTED SOLUTION

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2 REPLIES 2

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Thanks @Jing Zhao for the answer.