integration/spark/src/main/scala/org/apache/spark/CarbonInputMetrics.scala

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.spark

import java.lang.Long

import org.apache.spark.deploy.SparkHadoopUtil
import org.apache.spark.executor.{DataReadMethod, InputMetrics}

import org.apache.carbondata.common.logging.LogServiceFactory
import org.apache.carbondata.hadoop.{CarbonMultiBlockSplit, InputMetricsStats}
import org.apache.carbondata.spark.InitInputMetrics

/**
 * It gives statistics of number of bytes and record read
 */
class CarbonInputMetrics extends InitInputMetrics {
  @transient val LOGGER = LogServiceFactory.getLogService(this.getClass.getName)
  var inputMetrics: InputMetrics = _
  var bytesReadCallback: Option[() => scala.Long] = _
  var carbonMultiBlockSplit: CarbonMultiBlockSplit = _

  def initBytesReadCallback(context: TaskContext,
                            carbonMultiBlockSplit: CarbonMultiBlockSplit) {
    inputMetrics = context.taskMetrics().getInputMetricsForReadMethod(DataReadMethod.Hadoop)
    this.carbonMultiBlockSplit = carbonMultiBlockSplit;
    bytesReadCallback = carbonMultiBlockSplit match {
      case _: CarbonMultiBlockSplit =>
        SparkHadoopUtil.get.getFSBytesReadOnThreadCallback()
      case _ => None
    }
  }

  def incrementRecordRead(recordRead: Long) {
    inputMetrics.incRecordsRead(recordRead)
  }

  def updateAndClose() {
    if (bytesReadCallback.isDefined) {
      inputMetrics.updateBytesRead()
    } else if (carbonMultiBlockSplit.isInstanceOf[CarbonMultiBlockSplit]) {
      // If we can't get the bytes read from the FS stats, fall back to the split size,
      // which may be inaccurate.
      try {
        inputMetrics.incBytesRead(carbonMultiBlockSplit.getLength)
      } catch {
        case e: java.io.IOException =>
          LOGGER.warn("Unable to get input size to set InputMetrics for task:" + e.getMessage)
      }
    }
  }
}