ivankelly commented on a change in pull request #1593: PIP-17: the part of index block for offload. URL: https://github.com/apache/incubator-pulsar/pull/1593#discussion_r183670708
########## File path: pulsar-broker/src/main/java/org/apache/pulsar/broker/s3offload/impl/OffloadIndexBlockImpl.java ########## @@ -0,0 +1,198 @@ +/** + * 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; + +import static com.google.common.base.Preconditions.checkState; + +import com.google.common.annotations.Beta; +import com.google.common.collect.Sets; +import io.netty.buffer.ByteBuf; +import io.netty.buffer.ByteBufInputStream; +import io.netty.buffer.Unpooled; +import io.netty.util.Recycler; +import io.netty.util.Recycler.Handle; +import java.io.DataInputStream; +import java.io.IOException; +import java.io.InputStream; +import java.util.List; +import java.util.TreeSet; +import org.apache.bookkeeper.client.LedgerMetadata; +import org.apache.bookkeeper.versioning.Version; +import org.apache.pulsar.broker.namespace.OwnershipCache; +import org.apache.pulsar.broker.s3offload.OffloadIndexBlock; +import org.apache.pulsar.broker.s3offload.OffloadIndexEntry; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +@Beta +public class OffloadIndexBlockImpl implements OffloadIndexBlock { + private static final Logger log = LoggerFactory.getLogger(OwnershipCache.class); + + private static final int indexMagicWord = 1000; + + private LedgerMetadata segmentMetadata; + private TreeSet<OffloadIndexEntryImpl> indexEntries; + + private final Handle<OffloadIndexBlockImpl> recyclerHandle; + + private static final Recycler<OffloadIndexBlockImpl> RECYCLER = new Recycler<OffloadIndexBlockImpl>() { + @Override + protected OffloadIndexBlockImpl newObject(Recycler.Handle<OffloadIndexBlockImpl> handle) { + return new OffloadIndexBlockImpl(handle); + } + }; + + private OffloadIndexBlockImpl(Handle<OffloadIndexBlockImpl> recyclerHandle) { + this.recyclerHandle = recyclerHandle; + } + + public static OffloadIndexBlockImpl get(LedgerMetadata metadata, List<OffloadIndexEntryImpl> entries) { + OffloadIndexBlockImpl block = RECYCLER.get(); + block.indexEntries = Sets.newTreeSet(); + entries.forEach(entry -> block.indexEntries.add(entry)); + checkState(entries.size() == block.indexEntries.size()); + block.segmentMetadata = metadata; + return block; + } + + public static OffloadIndexBlockImpl get(InputStream stream) throws IOException { + OffloadIndexBlockImpl block = RECYCLER.get(); + block.indexEntries = Sets.newTreeSet(); + block.fromStream(stream); + return block; + } + + public void recycle() { + segmentMetadata = null; + indexEntries.clear(); + indexEntries = null; + if (recyclerHandle != null) { + recyclerHandle.recycle(this); + } + } + + @Override + public OffloadIndexEntry getEntry(long messageEntryId) { + if(messageEntryId > segmentMetadata.getLastEntryId()) { + log.warn("Try to get entry: {}, which beyond lastEntryId {}, return null", + messageEntryId, segmentMetadata.getLastEntryId()); + return null; + } + // find the greatest mapping Id whose entryId <= messageEntryId + return this.indexEntries.floor(OffloadIndexEntryImpl.of(messageEntryId, 0, 0)); + } + + @Override + public int getEntryCount() { + return this.indexEntries.size(); + } + + @Override + public LedgerMetadata getLedgerMetadata() { + return this.segmentMetadata; + } + + private static byte[] buildLedgerMetadataFormat(LedgerMetadata metadata) { + checkState(metadata instanceof org.apache.bookkeeper.client.LedgerMetadata); + + org.apache.bookkeeper.client.LedgerMetadata ledgerMetadata = + (org.apache.bookkeeper.client.LedgerMetadata) metadata; + + return ledgerMetadata.serialize(); + } + + /** + * Get the content of the index block. + * Read out in format: + * | index_magic_header | index_block_len | index_entry_count | + * |segment_metadata_len | segment metadata | index entries | + */ + @Override + public InputStream readOut() throws IOException { + int indexBlockLength; + int segmentMetadataLength; + int indexEntryCount = this.indexEntries.size(); + + //LedgerMetadataFormat ledgerMetadataFormat = buildLedgerMetadataFormat(this.segmentMetadata); + //segmentMetadataLength = ledgerMetadataFormat.getSerializedSize(); + + byte[] ledgerMetadataByte = buildLedgerMetadataFormat(this.segmentMetadata); + segmentMetadataLength = ledgerMetadataByte.length; + + indexBlockLength = 4 /* magic header */ + + 4 /* index block length */ + + 4 /* segment metadata length */ + + 4 /* index entry count */ + + segmentMetadataLength + + indexEntryCount * (8 + 4 + 8); /* messageEntryId + blockPartId + blockOffset */ + + ByteBuf out = Unpooled.buffer(indexBlockLength, indexBlockLength); + + out.writeInt(indexMagicWord) + .writeInt(indexBlockLength) + .writeInt(segmentMetadataLength) + .writeInt(indexEntryCount); + + // write metadata + checkState(out.writerIndex() == 16); + out.writeBytes(ledgerMetadataByte); + + // write entries + this.indexEntries.forEach(entry -> + out.writeLong(entry.getEntryId()) + .writeInt(entry.getPartId()) + .writeLong(entry.getOffset())); + + return new ByteBufInputStream(out, true); + } + + private static LedgerMetadata parseLedgerMetadata(byte[] bytes) throws IOException { + return LedgerMetadata.parseConfig(bytes, Version.ANY, + org.apache.bookkeeper.shaded.com.google.common.base.Optional.<Long>absent()); + } + + private OffloadIndexBlock fromStream(InputStream stream) throws IOException { + DataInputStream dis = new DataInputStream(stream); + int magic = dis.readInt(); Review comment: Validate that the magic matches. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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