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From xccui <...@git.apache.org>
Subject [GitHub] flink pull request #4625: [FLINK-6233] [table] Support time-bounded stream i...
Date Wed, 06 Sep 2017 02:28:15 GMT
Github user xccui commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4625#discussion_r137158818
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/join/TimeBoundedStreamInnerJoin.scala
---
    @@ -0,0 +1,533 @@
    +/*
    + * 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.flink.table.runtime.join
    +
    +import java.text.SimpleDateFormat
    +import java.util
    +import java.util.Map.Entry
    +import java.util.{Date, List => JList}
    +
    +import org.apache.flink.api.common.functions.FlatJoinFunction
    +import org.apache.flink.api.common.state._
    +import org.apache.flink.api.common.typeinfo.{BasicTypeInfo, TypeInformation}
    +import org.apache.flink.api.java.typeutils.ListTypeInfo
    +import org.apache.flink.configuration.Configuration
    +import org.apache.flink.streaming.api.functions.co.CoProcessFunction
    +import org.apache.flink.table.codegen.Compiler
    +import org.apache.flink.table.runtime.CRowWrappingCollector
    +import org.apache.flink.table.runtime.join.JoinTimeIndicator.JoinTimeIndicator
    +import org.apache.flink.table.runtime.types.CRow
    +import org.apache.flink.table.util.Logging
    +import org.apache.flink.types.Row
    +import org.apache.flink.util.Collector
    +
    +/**
    +  * A CoProcessFunction to execute time-bounded stream inner-join.
    +  *
    +  * Sample criteria:
    +  *
    +  * L.time between R.time + X and R.time + Y
    +  * or AND R.time between L.time - Y and L.time - X
    +  *
    +  * @param leftLowerBound  X
    +  * @param leftUpperBound  Y
    +  * @param allowedLateness the lateness allowed for the two streams
    +  * @param leftType        the input type of left stream
    +  * @param rightType       the input type of right stream
    +  * @param genJoinFuncName the function code of other non-equi conditions
    +  * @param genJoinFuncCode the function name of other non-equi conditions
    +  * @param timeIndicator   indicate whether joining on proctime or rowtime
    +  *
    +  */
    +class TimeBoundedStreamInnerJoin(
    +  private val leftLowerBound: Long,
    +  private val leftUpperBound: Long,
    +  private val allowedLateness: Long,
    +  private val leftType: TypeInformation[Row],
    +  private val rightType: TypeInformation[Row],
    +  private val genJoinFuncName: String,
    +  private val genJoinFuncCode: String,
    +  private val leftTimeIdx: Int,
    +  private val rightTimeIdx: Int,
    +  private val timeIndicator: JoinTimeIndicator)
    +  extends CoProcessFunction[CRow, CRow, CRow]
    +    with Compiler[FlatJoinFunction[Row, Row, Row]]
    +    with Logging {
    +
    +  private var cRowWrapper: CRowWrappingCollector = _
    +
    +  // the join function for other conditions
    +  private var joinFunction: FlatJoinFunction[Row, Row, Row] = _
    +
    +  // cache to store the left stream records
    +  private var leftCache: MapState[Long, JList[Row]] = _
    +  // cache to store right stream records
    +  private var rightCache: MapState[Long, JList[Row]] = _
    +
    +  // state to record the timer on the left stream. 0 means no timer set
    +  private var leftTimerState: ValueState[Long] = _
    +  // state to record the timer on the right stream. 0 means no timer set
    +  private var rightTimerState: ValueState[Long] = _
    +
    +  private val leftRelativeSize: Long = -leftLowerBound
    +  private val rightRelativeSize: Long = leftUpperBound
    +
    +  private val relativeWindowSize = rightRelativeSize + leftRelativeSize
    +
    +  private var leftOperatorTime: Long = 0L
    +  private var rightOperatorTime: Long = 0L
    +
    +  private var backPressureSuggestion: Long = 0L
    --- End diff --
    
    This variable is used to store a suggestion value for performing backpressure *in the
future*. We could cache less records if one of the stream is held back with this suggestion.
It's just like moving the cache from Flink to upstream components (e.g., Kafka).


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