"MergeRollupTask": {
        "1hour.mergeType": "rollup",
        "1hour.bucketTimePeriod": "1h",
        "1hour.bufferTimePeriod": "3h",
        "1hour.maxNumRecordsPerSegment": "1000000",
        "1hour.maxNumRecordsPerTask": "5000000",
        "1hour.maxNumParallelBuckets": "5",
        "1day.mergeType": "rollup",
        "1day.bucketTimePeriod": "1d",
        "1day.bufferTimePeriod": "1d",
        "1day.roundBucketTimePeriod": "1d",
        "1day.maxNumRecordsPerSegment": "1000000",
        "1day.maxNumRecordsPerTask": "5000000",
        "metricColA.aggregationType": "sum",
        "metricColB.aggregationType": "max"
      }