druid hadoop reingest job spec

hadoop_task1.json

{
  "type": "index_hadoop",
  "hadoopDependencyCoordinates": ["org.apache.hadoop:hadoop-client:2.7.3"],
  "spec": {
    "dataSchema": {
      "dataSource": "FOO_SOURCE",
      "parser": {
        "type": "hadoopyString",
        "parseSpec": {
          "format": "json",
          "timestampSpec": {
            "column": "timestamp",
            "format": "auto"
          },
          "dimensionsSpec": {
            "dimensions": [],
            "dimensionExclusions": [],
            "spatialDimensions": []
          }
        }
      },
      "metricsSpec": [
        {
          "type": "count",
          "name": "rows"
        }
      ],
      "granularitySpec": {
        "type": "uniform",
        "segmentGranularity": "DAY",
        "queryGranularity": "NONE",
        "intervals": ["2017-01-01T00:00:00.000Z/2017-01-14T00:00:00.000Z"]
      }
    },
    "ioConfig": {
      "type": "hadoop",
      "inputSpec": {
        "type": "dataSource",
        "ingestionSpec": {
          "dataSource": "FOO_SOURCE",
          "intervals": ["2017-01-01T00:00:00.000Z/2017-01-14T00:00:00.000Z"],
          "segments": null
        }
      }
    },
    "tuningConfig": {
      "type": "hadoop",
      "maxRowsInMemory": 75000,
      "partitionsSpec": {
        "type": "hashed",
        "targetPartitionSize": 5000000
      },
      "forceExtendableShardSpecs": true,
      "jobProperties": {
        "mapreduce.job.classloader": "true",
        "mapreduce.job.classloader.system.classes": "-javax.validation.,java.,javax.,org.apache.commons.logging.,org.apache.log4j.,org.apache.hadoop."
      }
    }
  }
}