mcvsubbu commented on issue #4952: Adding new Controller APIs for retrieving and setting tag for an instance URL: https://github.com/apache/incubator-pinot/pull/4952#issuecomment-572168316 I am fine adding a PUT on the instance config to modify the tag list. We have to have a caveat that PUT cannot be executed in multiple threads. For example, if someone runs PUT to add a tag A, and another runs a PUT to add tag B, only one of these may be added, and the other one ignored. In order to make things better, we should probably return the znode version in GET, and accept ifNotMofied Header on the PUT operation.
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