Ansible: How to add variables to "command" or "shell"

The syntax error is because you started a value with {. If you begin a value with a variable like so:

command: {{ my_var }}

then you must quote the whole line:

command: "{{ my_var }}"

This is due to the parser not being able to distinguish between YAML's dictionary syntax and variable interpolation otherwise.

Quote the full string in the command argument:

- name: Iniciar zkfc
  command: "{{ hadoop_version }}/sbin/hadoop-daemon.sh start zkfc"

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