fredxfred commented on issue #3494: adding StarTreeIndexv1 I/O for hadoop URL: https://github.com/apache/incubator-pinot/pull/3494#issuecomment-441747169 One of our use cases is that we would like to change which columns are star tree indexed in a live cluster (to see the impact on performance). We haven't been able to get the REST command to update table config to work without reloading segments (possibly there is a bug there?), which brings our cluster down for too long. Having the StarTreeIndexSpecFile read as a parameter to the hadoop job gives us flexibility regarding which columns are indexed and avoids having to update the table config
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