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Issue 66: Incorrect cluster membership (#69)
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* Changes the configuration location for zookeeper from "/conf" to "/data/conf" which is a writable folder, so new dynamic configurations can get persisted.

* Fixes the following issues with Readiness Probe:
  - Always failing on servers that start as "observers" because of exit 1 added in block that upgrades observers to participants.
  - Post deletion and restart Server-0 remains as "observer" and never changes to "participant" as this server is ignored by the readiness probe script.
  - Adds 'nslookup' to make sure upgrade is not attempted when service is not yet available (for the very first probe on server 0, that has not yet started)

Signed-off-by: pbelgundi <[email protected]>
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pbelgundi authored and fpj committed Jun 28, 2019
1 parent 43a0bd7 commit 8874826
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