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[CELEBORN-894] Add config to disable checksum
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125 changes: 125 additions & 0 deletions
125
common/src/main/java/org/apache/celeborn/common/util/PushDataHeaderUtils.java
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| @@ -0,0 +1,125 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.celeborn.common.util; | ||
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| import java.util.zip.CRC32; | ||
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| import org.apache.celeborn.common.unsafe.Platform; | ||
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| public class PushDataHeaderUtils { | ||
| // Data Header Layout: | ||
| // | mapId (4 bytes) | | ||
| // | attemptId (4 bytes) | | ||
| // | batchId with checksum flag (4 bytes) | | ||
| // | length with checksum length (4 bytes) | | ||
| // | checksum (4 bytes) | | ||
| // | ||
| // Fields description: | ||
| // - mapId: Unique identifier for the map (4 bytes) | ||
| // - attemptId: Identifier for the attempt (4 bytes) | ||
| // - batchId with checksum flag: | ||
| // -- checksum flag: 1 bit (indicates if batchId has a checksum) | ||
| // -- batchId: 31 bits (always positive when represented as an integer) | ||
| // - length with checksum length: total length of the data + 4 bytes for checksum | ||
| // - checksum: Always positive integer (4 bytes) | ||
| public static final int BATCH_HEADER_SIZE = 5 * 4; | ||
| public static final int BATCH_HEADER_SIZE_WITHOUT_CHECKSUM = BATCH_HEADER_SIZE - 4; | ||
| public static final int MAP_ID_OFFSET = Platform.BYTE_ARRAY_OFFSET; | ||
| public static final int ATTEMPT_ID_OFFSET = Platform.BYTE_ARRAY_OFFSET + 4; | ||
| public static final int BATCH_ID_OFFSET = Platform.BYTE_ARRAY_OFFSET + 8; | ||
| public static final int LENGTH_OFFSET = Platform.BYTE_ARRAY_OFFSET + 12; | ||
| public static final int CHECKSUM_OFFSET = Platform.BYTE_ARRAY_OFFSET + 16; | ||
| public static final int POSITIVE_MASK = 0x7FFFFFFF; | ||
| public static final int HIGHEST_1_BIT_FLAG_MASK = 0x80000000; | ||
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| public static void buildDataHeader( | ||
| byte[] data, int mapId, int attemptId, int batchId, int length, boolean enableChecksum) { | ||
| if (enableChecksum) { | ||
| assert data.length >= BATCH_HEADER_SIZE; | ||
| int batchIdWithChecksumFlag = batchIdWithChecksumFlag(batchId); | ||
| int lengthWithChecksum = length + 4; | ||
| Platform.putInt(data, MAP_ID_OFFSET, mapId); | ||
| Platform.putInt(data, ATTEMPT_ID_OFFSET, attemptId); | ||
| Platform.putInt(data, BATCH_ID_OFFSET, batchIdWithChecksumFlag); | ||
| Platform.putInt(data, LENGTH_OFFSET, lengthWithChecksum); | ||
| Platform.putInt(data, CHECKSUM_OFFSET, computeHeaderChecksum32(data)); | ||
| } else { | ||
| assert data.length >= BATCH_HEADER_SIZE_WITHOUT_CHECKSUM; | ||
| Platform.putInt(data, MAP_ID_OFFSET, mapId); | ||
| Platform.putInt(data, ATTEMPT_ID_OFFSET, attemptId); | ||
| Platform.putInt(data, BATCH_ID_OFFSET, batchId); | ||
| Platform.putInt(data, LENGTH_OFFSET, length); | ||
| } | ||
| } | ||
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| public static int batchIdWithChecksumFlag(int batchId) { | ||
| return batchId | HIGHEST_1_BIT_FLAG_MASK; | ||
| } | ||
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| public static int batchIdWithoutChecksumFlag(int batchId) { | ||
| return batchId & POSITIVE_MASK; | ||
| } | ||
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| public static boolean hasChecksumFlag(byte[] data) { | ||
| int batchId = Platform.getInt(data, BATCH_ID_OFFSET); | ||
| return (batchId & HIGHEST_1_BIT_FLAG_MASK) != 0; | ||
| } | ||
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| public static int getMapId(byte[] data) { | ||
| return Platform.getInt(data, MAP_ID_OFFSET); | ||
| } | ||
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| public static int getAttemptId(byte[] data) { | ||
| return Platform.getInt(data, ATTEMPT_ID_OFFSET); | ||
| } | ||
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| public static int getBatchId(byte[] data) { | ||
| return batchIdWithoutChecksumFlag(Platform.getInt(data, BATCH_ID_OFFSET)); | ||
| } | ||
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| public static int getChecksumLength(byte[] data) { | ||
| if (hasChecksumFlag(data)) { | ||
| return 4; | ||
| } else { | ||
| return 0; | ||
| } | ||
| } | ||
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| public static int getDataLength(byte[] data) { | ||
| return Platform.getInt(data, LENGTH_OFFSET) - getChecksumLength(data); | ||
| } | ||
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| // lengthWithChecksumLength = Platform.getInt(data, LENGTH_OFFSET) | ||
| public static int getTotalLengthWithHeader(byte[] data) { | ||
| return BATCH_HEADER_SIZE_WITHOUT_CHECKSUM + Platform.getInt(data, LENGTH_OFFSET); | ||
| } | ||
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| public static int computeHeaderChecksum32(byte[] data) { | ||
| assert data.length >= BATCH_HEADER_SIZE_WITHOUT_CHECKSUM; | ||
| CRC32 crc32 = new CRC32(); | ||
| crc32.update(data, 0, BATCH_HEADER_SIZE_WITHOUT_CHECKSUM); | ||
| return ((int) crc32.getValue()) & POSITIVE_MASK; | ||
| } | ||
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| public static boolean checkHeaderChecksum32(byte[] data) { | ||
| assert data.length >= BATCH_HEADER_SIZE; | ||
| int expectedChecksum = Platform.getInt(data, CHECKSUM_OFFSET); | ||
| int currentChecksum = computeHeaderChecksum32(data); | ||
| return currentChecksum == expectedChecksum; | ||
| } | ||
| } |
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