awelless commented on code in PR #10077: URL: https://github.com/apache/nifi/pull/10077#discussion_r2325142663
########## nifi-extension-bundles/nifi-aws-bundle/nifi-aws-kinesis/src/main/java/org/apache/nifi/processors/aws/kinesis/MemoryBoundRecordBuffer.java: ########## @@ -0,0 +1,674 @@ +/* + * 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.nifi.processors.aws.kinesis; + +import jakarta.annotation.Nullable; +import org.apache.nifi.logging.ComponentLog; +import org.apache.nifi.processors.aws.kinesis.RecordBuffer.ShardBufferId; +import org.apache.nifi.processors.aws.kinesis.RecordBuffer.ShardBufferLease; +import software.amazon.kinesis.exceptions.InvalidStateException; +import software.amazon.kinesis.exceptions.KinesisClientLibDependencyException; +import software.amazon.kinesis.exceptions.ShutdownException; +import software.amazon.kinesis.exceptions.ThrottlingException; +import software.amazon.kinesis.processor.RecordProcessorCheckpointer; +import software.amazon.kinesis.retrieval.KinesisClientRecord; + +import java.nio.ByteBuffer; +import java.time.Duration; +import java.util.ArrayList; +import java.util.Collection; +import java.util.HashSet; +import java.util.List; +import java.util.Optional; +import java.util.Queue; +import java.util.Random; +import java.util.Set; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ConcurrentLinkedQueue; +import java.util.concurrent.ConcurrentMap; +import java.util.concurrent.CountDownLatch; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.concurrent.atomic.AtomicLong; +import java.util.concurrent.atomic.AtomicReference; + +import static java.util.Collections.emptyList; + +/** + * A record buffer which limits the maximum memory usage across all shard buffers. + * If the memory limit is reached, adding new records will block until enough memory is freed. + */ +final class MemoryBoundRecordBuffer implements RecordBuffer.ForKinesisClientLibrary, RecordBuffer.ForProcessor { + + private final ComponentLog logger; + + private final long checkpointIntervalMillis; + private final BlockingMemoryTracker memoryTracker; + + private final AtomicLong bufferIdCounter = new AtomicLong(0); + private final ConcurrentMap<ShardBufferId, ShardBuffer> shardBuffers = new ConcurrentHashMap<>(); + + /** + * A queue with ids shard buffers available for leasing. + * <p> + * Note: when a buffer is invalidated its id is NOT removed from the queue immediately. + */ + private final Queue<ShardBufferId> buffersToLease = new ConcurrentLinkedQueue<>(); + + MemoryBoundRecordBuffer(final ComponentLog logger, final long maxMemoryBytes, final Duration checkpointInterval) { + this.logger = logger; + this.memoryTracker = new BlockingMemoryTracker(logger, maxMemoryBytes); + this.checkpointIntervalMillis = checkpointInterval.toMillis(); + } + + @Override + public ShardBufferId createBuffer(final String shardId) { + final ShardBufferId id = new ShardBufferId(shardId, bufferIdCounter.getAndIncrement()); + + logger.info("Creating new buffer for shard {} with id {}", shardId, id); + + shardBuffers.put(id, new ShardBuffer(id, logger, checkpointIntervalMillis)); + buffersToLease.add(id); + return id; + } + + @Override + public void addRecords(final ShardBufferId bufferId, final List<KinesisClientRecord> records, final RecordProcessorCheckpointer checkpointer) { + if (records.isEmpty()) { + return; + } + + final ShardBuffer buffer = shardBuffers.get(bufferId); + if (buffer == null) { + logger.debug("Buffer with id {} not found. Cannot add records with sequence and subsequence numbers: {}.{} - {}.{}", + bufferId, + records.getFirst().sequenceNumber(), + records.getFirst().subSequenceNumber(), + records.getLast().sequenceNumber(), + records.getLast().subSequenceNumber()); + return; + } + + final RecordBatch recordBatch = new RecordBatch(records, checkpointer, calculateMemoryUsage(records)); + memoryTracker.reserveMemory(recordBatch); + final boolean addedRecords = buffer.offer(recordBatch); + + if (addedRecords) { + logger.debug("Successfully added records with sequence and subsequence numbers: {}.{} - {}.{} to buffer with id {}", + records.getFirst().sequenceNumber(), + records.getFirst().subSequenceNumber(), + records.getLast().sequenceNumber(), + records.getLast().subSequenceNumber(), + bufferId); + } else { + logger.debug("Buffer with id {} was invalidated. Cannot add records with sequence and subsequence numbers: {}.{} - {}.{}", + bufferId, + records.getFirst().sequenceNumber(), + records.getFirst().subSequenceNumber(), + records.getLast().sequenceNumber(), + records.getLast().subSequenceNumber()); + // If the buffer was invalidated, we should free memory reserved for these records. + memoryTracker.freeMemory(List.of(recordBatch)); + } + } + + @Override + public void checkpointEndedShard(final ShardBufferId bufferId, final RecordProcessorCheckpointer checkpointer) { + final ShardBuffer buffer = shardBuffers.get(bufferId); + if (buffer == null) { + logger.debug("Buffer with id {} not found. Cannot checkpoint the ended shard", bufferId); + return; + } + + logger.info("Finishing consumption for buffer {}. Checkpointing the ended shard", bufferId); Review Comment: Discussing in [this thread](https://github.com/apache/nifi/pull/10077#discussion_r2323450270). -- This is an automated message from the Apache Git Service. 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