shangxinli commented on code in PR #968: URL: https://github.com/apache/parquet-mr/pull/968#discussion_r1038807754
########## parquet-common/src/main/java/org/apache/parquet/bytes/AsyncMultiBufferInputStream.java: ########## @@ -0,0 +1,162 @@ +/* + * 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.parquet.bytes; + +import java.io.IOException; +import java.nio.ByteBuffer; +import java.util.List; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Future; +import java.util.concurrent.LinkedBlockingQueue; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.LongAccumulator; +import java.util.concurrent.atomic.LongAdder; +import org.apache.parquet.io.SeekableInputStream; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +class AsyncMultiBufferInputStream extends MultiBufferInputStream { + + private static final Logger LOG = LoggerFactory.getLogger(AsyncMultiBufferInputStream.class); + + private int fetchIndex = 0; + private final SeekableInputStream fileInputStream; + private int readIndex = 0; + private ExecutorService threadPool; + private LinkedBlockingQueue<Future<Void>> readFutures; + private boolean closed = false; + + private LongAdder totalTimeBlocked = new LongAdder(); + private LongAdder totalCountBlocked = new LongAdder(); + private LongAccumulator maxTimeBlocked = new LongAccumulator(Long::max, 0L); + + AsyncMultiBufferInputStream(ExecutorService threadPool, SeekableInputStream fileInputStream, + List<ByteBuffer> buffers) { + super(buffers); + this.fileInputStream = fileInputStream; + this.threadPool = threadPool; + readFutures = new LinkedBlockingQueue<>(buffers.size()); + if (LOG.isDebugEnabled()) { + LOG.debug("ASYNC: Begin read into buffers "); + for (ByteBuffer buf : buffers) { + LOG.debug("ASYNC: buffer {} ", buf); + } + } + fetchAll(); + } + + private void checkState() { + if (closed) { + throw new RuntimeException("Stream is closed"); + } + } + + private void fetchAll() { + checkState(); + submitReadTask(0); + } + + private void submitReadTask(int bufferNo) { + ByteBuffer buffer = buffers.get(bufferNo); + try { + readFutures.put(threadPool.submit(() -> { + readOneBuffer(buffer); + if (bufferNo < buffers.size() - 1) { + submitReadTask(bufferNo + 1); + } + return null; + }) + ); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + throw new RuntimeException(e); + } + } + + private void readOneBuffer(ByteBuffer buffer) { + long startTime = System.nanoTime(); + try { + fileInputStream.readFully(buffer); + buffer.flip(); + long readCompleted = System.nanoTime(); + long timeSpent = readCompleted - startTime; + LOG.debug("ASYNC Stream: READ - {}", timeSpent / 1000.0); + fetchIndex++; + } catch (IOException e) { + throw new RuntimeException(e); + } + } + + @Override + public boolean nextBuffer() { + checkState(); + // hack: parent constructor can call this method before this class is fully initialized. + // Just return without doing anything. + if (readFutures == null) { + return false; + } + if (readIndex < buffers.size()) { + long start = System.nanoTime(); + try { + if (LOG.isDebugEnabled()) { + LOG.debug("ASYNC (next): Getting next buffer"); + } + Future<Void> future = readFutures.take(); + future.get(); + long timeSpent = System.nanoTime() - start; + totalCountBlocked.add(1); + totalTimeBlocked.add(timeSpent); + maxTimeBlocked.accumulate(timeSpent); + if (LOG.isDebugEnabled()) { + LOG.debug("ASYNC (next): {}: Time blocked for read {} ns", this, timeSpent); + } + } catch (Exception e) { + if (e instanceof InterruptedException) { + Thread.currentThread().interrupt(); + } + LOG.error("Async (next): exception while getting next buffer: ", e); + throw new RuntimeException(e); + } + readIndex++; + } + return super.nextBuffer(); + } + + public void close() { + LOG.debug("ASYNC Stream: Blocked: {} {} {}", totalTimeBlocked.longValue() / 1000.0, + totalCountBlocked.longValue(), maxTimeBlocked.longValue() / 1000.0); + Future<Void> readResult; + while (!readFutures.isEmpty()) { + try { + readResult = readFutures.poll(); + readResult.get(); + if (!readResult.isDone() && !readResult.isCancelled()) { + readResult.cancel(true); + } else { + readResult.get(1, TimeUnit.MILLISECONDS); + } + } catch (Exception e) { + // Do nothing Review Comment: Do you think adding a log make sense? -- This is an automated message from the Apache Git Service. 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