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From GitBox <...@apache.org>
Subject [GitHub] zhaijack commented on a change in pull request #1678: PIP-17: provide BlockAwareSegmentInputStream implementation and test
Date Wed, 02 May 2018 11:23:19 GMT
zhaijack commented on a change in pull request #1678: PIP-17: provide BlockAwareSegmentInputStream
implementation and test
URL: https://github.com/apache/incubator-pulsar/pull/1678#discussion_r185464725
 
 

 ##########
 File path: pulsar-broker/src/main/java/org/apache/pulsar/broker/s3offload/impl/BlockAwareSegmentInputStream.java
 ##########
 @@ -0,0 +1,219 @@
+/**
+ * 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.collect.Lists;
+import com.google.common.primitives.Ints;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.CompositeByteBuf;
+import io.netty.buffer.PooledByteBufAllocator;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Iterator;
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+import org.apache.bookkeeper.client.api.LedgerEntries;
+import org.apache.bookkeeper.client.api.LedgerEntry;
+import org.apache.bookkeeper.client.api.ReadHandle;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ *
+ * The BlockAwareSegmentInputStream for each cold storage data block.
+ * It contains a byte buffer, which contains all the content for this data block.
+ *      DataBlockHeader + entries(each with format[[entry_size -- int][entry_id -- long][entry_data]])
+ *
+ */
+public class BlockAwareSegmentInputStream extends InputStream {
+    private static final Logger log = LoggerFactory.getLogger(BlockAwareSegmentInputStream.class);
+
+    private static final byte[] blockEndPadding = Ints.toByteArray(0xFEDCDEAD);
+
+    private final ReadHandle ledger;
+    private final long startEntryId;
+    private final int blockSize;
+
+    // Number of Message entries that read from ledger and been readout from this InputStream.
+    private int blockEntryCount;
+    // Number of payload Bytes read from ledger, and has been has been kept in this InputStream.
+    private int payloadBytesHave;
+    // Number of bytes that has been kept in this InputStream.
+    private int blockBytesHave;
+
+    // tracking read status for both header and entries.
+    // Bytes that already been read from this InputStream
+    private int bytesReadOffset = 0;
+    // Byte from this index is all padding byte
+    private int dataBlockFullOffset;
+    private final InputStream dataBlockHeaderStream;
+
+    // how many entries want to read from ReadHandle each time.
+    private static final int entriesNumberEachRead = 100;
+    // buf the entry size and entry id.
+    private static final int entryHeaderSize = 4 /* entry size*/ + 8 /* entry id */;
+    // Keep a list of all entries ByteBuf, each element contains 2 buf: entry header and
entry content.
+    private List<CompositeByteBuf> entriesByteBuf = null;
 
 Review comment:
   Thanks, it can be, would like to keep it , or change it to List<ByteBuf>, this is
more clear for code reader. 

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