Namenode not getting started

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I was facing the issue of namenode not starting. I found a solution using following:

  1. first delete all contents from temporary folder: rm -Rf <tmp dir> (my was /usr/local/hadoop/tmp)
  2. format the namenode: bin/hadoop namenode -format
  3. start all processes again:bin/start-all.sh

You may consider rolling back as well using checkpoint (if you had it enabled).

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