REmote script does not run on some hosts

[Pooja]

Hello , 

I am new to Ansible and not sure if am doing anything wrong. I have an ansible playbook to start the cassandra process. I see that the remote init script runs perfectly on some hosts and does not on other. The script just does not start the process nor does print any error. Help me out if am missing anything.

Playbook:

---

  hosts: [myhosts]

  serial: 1

  become: yes

  tasks:

  - name: start Cassandra

    shell: /etc/init.d/cassandra start

    async: true

    poll: 0

  - name: Wait for Cassandra to start

    wait_for:

     host: "{{ansible_default_ipv4.address}}"

     port: 9042