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Hey @Lalita Kumari Any stack trace with the HTTP 500 error? I've seen where the Druid API's are "chatty" and will expose the stack. Also try using Postman or similar tool to make that coordinator call. I generally have Postman calls set up for all my Druid functionality, it's just easier and you can have Postman generate the cURL command. Finally, if you post the cURL command here, people can usually more easily try what you're trying and perhaps see the same result...🤗

The load rules are expected to be passed in as an array. This should work.

retention_rule = [{
    "type": "loadForever"
}]

Good one @Benjamin Hopp Malformed JSON should throw an exception other than HTTP 500, so you could consider logging a defect/enhancement... 🤔

thank you @Benjamin Hopp it worked