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ASF GitHub Bot commented on FLINK-8547: --------------------------------------- Github user pnowojski commented on a diff in the pull request: https://github.com/apache/flink/pull/5400#discussion_r165943880 --- Diff: flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/io/BufferBlockerTest.java --- @@ -0,0 +1,322 @@ +/* + * 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.streaming.runtime.io; + +import org.apache.flink.core.memory.MemorySegment; +import org.apache.flink.core.memory.MemorySegmentFactory; +import org.apache.flink.runtime.io.network.buffer.Buffer; +import org.apache.flink.runtime.io.network.buffer.FreeingBufferRecycler; +import org.apache.flink.runtime.io.network.buffer.NetworkBuffer; +import org.apache.flink.runtime.io.network.partition.consumer.BufferOrEvent; +import org.apache.flink.streaming.runtime.io.CreditBasedBufferBlocker.BufferOrEventSequence; + +import org.junit.After; +import org.junit.Before; +import org.junit.Test; + +import java.util.ArrayDeque; +import java.util.ArrayList; +import java.util.Random; + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertNotNull; +import static org.junit.Assert.assertNull; +import static org.junit.Assert.assertTrue; +import static org.junit.Assert.fail; + +/** + * Tests for {@link CreditBasedBufferBlocker}. + */ +public class BufferBlockerTest { --- End diff -- Rename class to `CreditBasedBufferBlockerTest` > Implement CheckpointBarrierHandler not to spill data for exactly-once based > on credit-based flow control > -------------------------------------------------------------------------------------------------------- > > Key: FLINK-8547 > URL: https://issues.apache.org/jira/browse/FLINK-8547 > Project: Flink > Issue Type: Sub-task > Components: Network > Affects Versions: 1.5.0 > Reporter: zhijiang > Assignee: zhijiang > Priority: Major > > Currently in exactly-once mode, the {{BarrierBuffer}} would block inputs with > barriers until all inputs have received the barrier for a given checkpoint. > To avoid back-pressuring the input streams which may cause distributed > deadlocks, the {{BarrierBuffer}} has to spill the data in disk files to > recycle the buffers for blocked channels. > > Based on credit-based flow control, every channel has exclusive buffers, so > it is no need to spill data for avoiding deadlock. Then we implement a new > {{CheckpointBarrierHandler}} for only buffering the data for blocked channels > for better performance. > > And this new {{CheckpointBarrierHandler}} can also be configured to use or > not in order to rollback the original mode for unexpected risks. -- This message was sent by Atlassian JIRA (v7.6.3#76005)