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ReadHandle implementation backed by S3 (#1790)
Implementation of bookkeeper ReadHandle, which reads from an S3 object. Master Issue: #1511
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207
...-broker/src/main/java/org/apache/pulsar/broker/s3offload/impl/S3BackedReadHandleImpl.java
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| /** | |||
| * 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.pulsar.broker.s3offload.impl; | |||
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| import com.amazonaws.AmazonClientException; | |||
| import com.amazonaws.services.s3.AmazonS3; | |||
| import com.amazonaws.services.s3.model.GetObjectRequest; | |||
| import com.amazonaws.services.s3.model.ObjectMetadata; | |||
| import com.amazonaws.services.s3.model.S3Object; | |||
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| import io.netty.buffer.ByteBuf; | |||
| import io.netty.buffer.PooledByteBufAllocator; | |||
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| import java.io.DataInputStream; | |||
| import java.io.IOException; | |||
| import java.util.ArrayList; | |||
| import java.util.List; | |||
| import java.util.concurrent.CompletableFuture; | |||
| import java.util.concurrent.ExecutorService; | |||
| import java.util.concurrent.ScheduledExecutorService; | |||
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| import org.apache.bookkeeper.client.BKException; | |||
| import org.apache.bookkeeper.client.api.LastConfirmedAndEntry; | |||
| import org.apache.bookkeeper.client.api.LedgerEntries; | |||
| import org.apache.bookkeeper.client.api.LedgerEntry; | |||
| import org.apache.bookkeeper.client.api.LedgerMetadata; | |||
| import org.apache.bookkeeper.client.api.ReadHandle; | |||
| import org.apache.bookkeeper.client.impl.LedgerEntriesImpl; | |||
| import org.apache.bookkeeper.client.impl.LedgerEntryImpl; | |||
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| import org.apache.pulsar.broker.s3offload.OffloadIndexBlock; | |||
| import org.apache.pulsar.broker.s3offload.OffloadIndexBlockBuilder; | |||
| import org.apache.pulsar.broker.s3offload.OffloadIndexEntry; | |||
| import org.apache.pulsar.broker.s3offload.S3BackedInputStream; | |||
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| import org.slf4j.Logger; | |||
| import org.slf4j.LoggerFactory; | |||
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| public class S3BackedReadHandleImpl implements ReadHandle { | |||
| private static final Logger log = LoggerFactory.getLogger(S3BackedReadHandleImpl.class); | |||
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| private final long ledgerId; | |||
| private final OffloadIndexBlock index; | |||
| private final S3BackedInputStream inputStream; | |||
| private final DataInputStream dataStream; | |||
| private final ExecutorService executor; | |||
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| private S3BackedReadHandleImpl(long ledgerId, OffloadIndexBlock index, | |||
| S3BackedInputStream inputStream, | |||
| ExecutorService executor) { | |||
| this.ledgerId = ledgerId; | |||
| this.index = index; | |||
| this.inputStream = inputStream; | |||
| this.dataStream = new DataInputStream(inputStream); | |||
| this.executor = executor; | |||
| } | |||
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| @Override | |||
| public long getId() { | |||
| return ledgerId; | |||
| } | |||
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| @Override | |||
| public LedgerMetadata getLedgerMetadata() { | |||
| return index.getLedgerMetadata(); | |||
| } | |||
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| @Override | |||
| public CompletableFuture<Void> closeAsync() { | |||
| CompletableFuture<Void> promise = new CompletableFuture<>(); | |||
| executor.submit(() -> { | |||
| try { | |||
| index.close(); | |||
| inputStream.close(); | |||
| promise.complete(null); | |||
| } catch (IOException t) { | |||
| promise.completeExceptionally(t); | |||
| } | |||
| }); | |||
| return promise; | |||
| } | |||
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| @Override | |||
| public CompletableFuture<LedgerEntries> readAsync(long firstEntry, long lastEntry) { | |||
| log.debug("Ledger {}: reading {} - {}", getId(), firstEntry, lastEntry); | |||
| CompletableFuture<LedgerEntries> promise = new CompletableFuture<>(); | |||
| executor.submit(() -> { | |||
| if (firstEntry > lastEntry | |||
| || firstEntry < 0 | |||
| || lastEntry > getLastAddConfirmed()) { | |||
| promise.completeExceptionally(new BKException.BKIncorrectParameterException()); | |||
| return; | |||
| } | |||
| long entriesToRead = (lastEntry - firstEntry) + 1; | |||
| List<LedgerEntry> entries = new ArrayList<LedgerEntry>(); | |||
| long nextExpectedId = firstEntry; | |||
| try { | |||
| OffloadIndexEntry entry = index.getIndexEntryForEntry(firstEntry); | |||
| inputStream.seek(entry.getDataOffset()); | |||
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| while (entriesToRead > 0) { | |||
| int length = dataStream.readInt(); | |||
| if (length < 0) { // hit padding or new block | |||
| inputStream.seekForward(index.getIndexEntryForEntry(nextExpectedId).getDataOffset()); | |||
| length = dataStream.readInt(); | |||
| } | |||
| long entryId = dataStream.readLong(); | |||
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| if (entryId == nextExpectedId) { | |||
| ByteBuf buf = PooledByteBufAllocator.DEFAULT.buffer(length, length); | |||
| entries.add(LedgerEntryImpl.create(ledgerId, entryId, length, buf)); | |||
| int toWrite = length; | |||
| while (toWrite > 0) { | |||
| toWrite -= buf.writeBytes(dataStream, toWrite); | |||
| } | |||
| entriesToRead--; | |||
| nextExpectedId++; | |||
| } else if (entryId > lastEntry) { | |||
| log.info("Expected to read {}, but read {}, which is greater than last entry {}", | |||
| nextExpectedId, entryId, lastEntry); | |||
| throw new BKException.BKUnexpectedConditionException(); | |||
| } else { | |||
| inputStream.skip(length); | |||
| } | |||
| } | |||
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| promise.complete(LedgerEntriesImpl.create(entries)); | |||
| } catch (Throwable t) { | |||
| promise.completeExceptionally(t); | |||
| entries.forEach(LedgerEntry::close); | |||
| } | |||
| }); | |||
| return promise; | |||
| } | |||
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| @Override | |||
| public CompletableFuture<LedgerEntries> readUnconfirmedAsync(long firstEntry, long lastEntry) { | |||
| return readAsync(firstEntry, lastEntry); | |||
| } | |||
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| @Override | |||
| public CompletableFuture<Long> readLastAddConfirmedAsync() { | |||
| return CompletableFuture.completedFuture(getLastAddConfirmed()); | |||
| } | |||
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| @Override | |||
| public CompletableFuture<Long> tryReadLastAddConfirmedAsync() { | |||
| return CompletableFuture.completedFuture(getLastAddConfirmed()); | |||
| } | |||
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| @Override | |||
| public long getLastAddConfirmed() { | |||
| return getLedgerMetadata().getLastEntryId(); | |||
| } | |||
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| @Override | |||
| public long getLength() { | |||
| return getLedgerMetadata().getLength(); | |||
| } | |||
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| @Override | |||
| public boolean isClosed() { | |||
| return getLedgerMetadata().isClosed(); | |||
| } | |||
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| @Override | |||
| public CompletableFuture<LastConfirmedAndEntry> readLastAddConfirmedAndEntryAsync(long entryId, | |||
| long timeOutInMillis, | |||
| boolean parallel) { | |||
| CompletableFuture<LastConfirmedAndEntry> promise = new CompletableFuture<>(); | |||
| promise.completeExceptionally(new UnsupportedOperationException()); | |||
| return promise; | |||
| } | |||
|
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| public static ReadHandle open(ScheduledExecutorService executor, | |||
| AmazonS3 s3client, String bucket, String key, String indexKey, | |||
| long ledgerId, int readBufferSize) | |||
| throws AmazonClientException, IOException { | |||
| GetObjectRequest req = new GetObjectRequest(bucket, indexKey); | |||
| try (S3Object obj = s3client.getObject(req)) { | |||
| OffloadIndexBlockBuilder indexBuilder = OffloadIndexBlockBuilder.create(); | |||
| OffloadIndexBlock index = indexBuilder.fromStream(obj.getObjectContent()); | |||
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| ObjectMetadata dataMetadata = s3client.getObjectMetadata(bucket, key); // FIXME: this should be part of index | |||
| S3BackedInputStream inputStream = new S3BackedInputStreamImpl(s3client, bucket, key, | |||
| dataMetadata.getContentLength(), | |||
| readBufferSize); | |||
| return new S3BackedReadHandleImpl(ledgerId, index, inputStream, executor); | |||
| } | |||
| } | |||
| } | |||
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