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ASF GitHub Bot logged work on BEAM-7386: ---------------------------------------- Author: ASF GitHub Bot Created on: 14/Aug/19 14:29 Start Date: 14/Aug/19 14:29 Worklog Time Spent: 10m Work Description: je-ik commented on pull request #9032: [BEAM-7386] Bi-Temporal Join URL: https://github.com/apache/beam/pull/9032#discussion_r313896435 ########## File path: sdks/java/extensions/timeseries/src/main/java/org/apache/beam/sdk/extensions/timeseries/joins/BiTemporalStreams.java ########## @@ -0,0 +1,464 @@ +/* + * 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.beam.sdk.extensions.timeseries.joins; + +import java.util.*; +import org.apache.beam.sdk.annotations.Experimental; +import org.apache.beam.sdk.coders.Coder; +import org.apache.beam.sdk.coders.KvCoder; +import org.apache.beam.sdk.coders.VarLongCoder; +import org.apache.beam.sdk.state.*; +import org.apache.beam.sdk.state.Timer; +import org.apache.beam.sdk.transforms.DoFn; +import org.apache.beam.sdk.transforms.Flatten; +import org.apache.beam.sdk.transforms.PTransform; +import org.apache.beam.sdk.transforms.ParDo; +import org.apache.beam.sdk.transforms.join.KeyedPCollectionTuple; +import org.apache.beam.sdk.transforms.windowing.BoundedWindow; +import org.apache.beam.sdk.transforms.windowing.FixedWindows; +import org.apache.beam.sdk.transforms.windowing.PaneInfo; +import org.apache.beam.sdk.transforms.windowing.Window; +import org.apache.beam.sdk.util.WindowedValue; +import org.apache.beam.sdk.values.*; +import org.joda.time.Duration; +import org.joda.time.Instant; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * This sample will take two streams left stream and right stream. It will match the left stream to + * the nearest right stream based on their timestamp. Nearest left stream is either <= to the right + * stream timestamp. + * + * <p>If two values in the right steam have the same timestamp then the results are + * non-deterministic. + */ +@Experimental +public class BiTemporalStreams { + + public static <K, V1, V2> BiTemporalJoin<K, V1, V2> join( + TupleTag<V1> leftTag, TupleTag<V2> rightTag, Duration window) { + return new BiTemporalJoin<>(leftTag, rightTag, window); + } + + @Experimental + public static class BiTemporalJoin<K, V1, V2> + extends PTransform<KeyedPCollectionTuple<K>, PCollection<BiTemporalJoinResult<K, V1, V2>>> { + + private static final Logger LOG = LoggerFactory.getLogger(BiTemporalStreams.class); + + // Sets the limit at which point the processed left stream values are garbage collected + static int LEFT_STREAM_GC_LIMIT = 1000; + + Coder<V1> leftCoder; + Coder<V2> rightCoder; + + TupleTag<V1> leftTag; + TupleTag<V2> rightTag; + + Duration window; + + private BiTemporalJoin(TupleTag<V1> leftTag, TupleTag<V2> rightTag, Duration window) { + this.leftTag = leftTag; + this.rightTag = rightTag; + this.window = window; + } + + public static <K, V1, V2> BiTemporalJoin create( + TupleTag<V1> leftTag, TupleTag<V2> rightTag, Duration window) { + return new BiTemporalJoin<K, V1, V2>(leftTag, rightTag, window); Review comment: ```suggestion return new BiTemporalJoin<>(leftTag, rightTag, window); ``` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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For queries about this service, please contact Infrastructure at: us...@infra.apache.org Issue Time Tracking ------------------- Worklog Id: (was: 294776) Time Spent: 6h 20m (was: 6h 10m) > Add Utility BiTemporalStreamJoin > -------------------------------- > > Key: BEAM-7386 > URL: https://issues.apache.org/jira/browse/BEAM-7386 > Project: Beam > Issue Type: Improvement > Components: sdk-ideas > Affects Versions: 2.12.0 > Reporter: Reza ardeshir rokni > Assignee: Reza ardeshir rokni > Priority: Major > Time Spent: 6h 20m > Remaining Estimate: 0h > > Add utility class that enables a temporal join between two streams where > Stream A is matched to Stream B where > A.timestamp = (max(b.timestamp) where b.timestamp <= a.timestamp) > This will use the following overall flow: > KV(key, Timestamped<V>) > | Window > | GBK > | Statefull DoFn > > -- This message was sent by Atlassian JIRA (v7.6.14#76016)