examples/quickstart/tutorial/compaction-keep-granularity.json

{
  "type": "compact",
  "dataSource": "compaction-tutorial",
  "interval": "2015-09-12/2015-09-13",
  "tuningConfig" : {
    "type" : "index_parallel",
    "partitionsSpec": {
        "type": "dynamic"
    },
    "maxRowsInMemory" : 25000
  }
}