Re: [druid-user] Facing problem in configuring druid to query data

In druid group by queries, data gets collected in buffers for processing. If you are trying to collect a large set of data, increase your buffer size in historical/middle manager runtime properties. Increasing buffer size will increase your direct memory usage on data nodes, so if possible add more filters so scan results fit in your existing buffer. Also, you can set a large value for druid.query.groupBy.maxOnDiskStorage

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