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From jerryshao <...@git.apache.org>
Subject [GitHub] spark pull request: [SPARK-7112][Streaming][WIP] Add a InputInfoTr...
Date Fri, 01 May 2015 02:28:13 GMT
Github user jerryshao commented on a diff in the pull request:

    https://github.com/apache/spark/pull/5680#discussion_r29486738
  
    --- Diff: streaming/src/main/scala/org/apache/spark/streaming/scheduler/InputInfoTracker.scala
---
    @@ -0,0 +1,74 @@
    +/*
    + * 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.streaming.scheduler
    +
    +import scala.collection.mutable
    +
    +import org.apache.spark.Logging
    +import org.apache.spark.streaming.{Time, StreamingContext}
    +
    +/** To track the information of input stream at specified batch time. */
    +case class InputInfo(batchTime: Time, inputStreamId: Int, numRecords: Long)
    +
    +/**
    + * This class manages all the input streams as well as their input data statistics. The
information
    + * will output to StreamingListener to better monitoring.
    + */
    +private[streaming] class InputInfoTracker(ssc: StreamingContext) extends Logging {
    +
    +  /** Track all the input streams registered in DStreamGraph */
    +  val inputStreams = ssc.graph.getInputStreams()
    +  /** Track all the id of input streams registered in DStreamGraph */
    +  val inputStreamIds = inputStreams.map(_.id)
    +
    +  // Map to track all the InputInfo related to specific batch time and input stream.
    +  private val batchTimeToInputInfos = new mutable.HashMap[Time, mutable.HashMap[Int,
InputInfo]]
    +
    +  /** Report the input information with batch time to the tracker */
    +  def reportInfo(batchTime: Time, inputInfo: InputInfo): Unit = synchronized {
    +    val inputInfos = batchTimeToInputInfos.getOrElseUpdate(batchTime,
    +      new mutable.HashMap[Int, InputInfo]())
    +
    +    if (inputInfos.contains(inputInfo.inputStreamId)) {
    +      throw new IllegalStateException(s"Input stream ${inputInfo.inputStreamId}} for
batch" +
    +        s"$batchTime is already added into InputInfoTracker, this is a illegal state")
    +    }
    +    inputInfos += ((inputInfo.inputStreamId, inputInfo))
    +  }
    +
    +  /** Get the all the input stream's information of specified batch time */
    +  def getInfo(batchTime: Time): Map[Int, InputInfo] = synchronized {
    +    val inputInfos = batchTimeToInputInfos.get(batchTime)
    +    // Convert mutable HashMap to immutable Map for the caller
    +    inputInfos.map(_.toMap).getOrElse(Map[Int, InputInfo]())
    +  }
    +
    +  /** Get the input information of specified batch time and input stream id */
    +  def getInfoOfBatchAndStream(batchTime: Time, inputStreamId: Int
    --- End diff --
    
    Done.


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