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PIP-174: New managed ledger entry cache implementation
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35 changes: 35 additions & 0 deletions
35
...ged-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/cache/SharedCacheSegment.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,35 @@ | ||
| /** | ||
| * 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.bookkeeper.mledger.impl.cache; | ||
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| import io.netty.buffer.ByteBuf; | ||
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| public interface SharedCacheSegment extends AutoCloseable { | ||
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| boolean insert(long ledgerId, long entryId, ByteBuf entry); | ||
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| ByteBuf get(long ledgerId, long entryId); | ||
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| int getSize(); | ||
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| void clear(); | ||
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| @Override | ||
| void close(); | ||
| } |
99 changes: 99 additions & 0 deletions
99
.../src/main/java/org/apache/bookkeeper/mledger/impl/cache/SharedCacheSegmentBufferCopy.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,99 @@ | ||
| /** | ||
| * 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.bookkeeper.mledger.impl.cache; | ||
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| import io.netty.buffer.ByteBuf; | ||
| import java.util.concurrent.atomic.AtomicInteger; | ||
| import org.apache.pulsar.common.allocator.PulsarByteBufAllocator; | ||
| import org.apache.pulsar.common.util.collections.ConcurrentLongLongPairHashMap; | ||
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| class SharedCacheSegmentBufferCopy implements AutoCloseable, SharedCacheSegment { | ||
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| private final ByteBuf cacheBuffer; | ||
| private final AtomicInteger currentOffset = new AtomicInteger(); | ||
| private final ConcurrentLongLongPairHashMap index; | ||
| private final int segmentSize; | ||
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| private static final int ALIGN_64_MASK = ~(64 - 1); | ||
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| SharedCacheSegmentBufferCopy(int segmentSize) { | ||
| this.segmentSize = segmentSize; | ||
| this.cacheBuffer = PulsarByteBufAllocator.DEFAULT.buffer(segmentSize, segmentSize); | ||
| this.cacheBuffer.writerIndex(segmentSize - 1); | ||
| this.index = ConcurrentLongLongPairHashMap.newBuilder() | ||
| // We are going to often clear() the map, with the expectation that it's going to get filled again | ||
| // immediately after. In these conditions it does not make sense to shrink it each time. | ||
| .autoShrink(false) | ||
| .concurrencyLevel(Runtime.getRuntime().availableProcessors() * 8) | ||
| .build(); | ||
| } | ||
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| @Override | ||
| public boolean insert(long ledgerId, long entryId, ByteBuf entry) { | ||
| int entrySize = entry.readableBytes(); | ||
| int alignedSize = align64(entrySize); | ||
| int offset = currentOffset.getAndAdd(alignedSize); | ||
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| if (offset + entrySize > segmentSize) { | ||
| // The segment is full | ||
| return false; | ||
| } else { | ||
| // Copy entry into read cache segment | ||
| cacheBuffer.setBytes(offset, entry, entry.readerIndex(), entry.readableBytes()); | ||
| long value = offset << 32 | entrySize; | ||
| index.put(ledgerId, entryId, value, 0); | ||
| return true; | ||
| } | ||
| } | ||
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| @Override | ||
| public ByteBuf get(long ledgerId, long entryId) { | ||
| long value = index.getFirstValue(ledgerId, entryId); | ||
| if (value >= 0) { | ||
| int offset = (int) (value >> 32); | ||
| int entryLen = (int) value; | ||
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| ByteBuf entry = PulsarByteBufAllocator.DEFAULT.buffer(entryLen, entryLen); | ||
| entry.writeBytes(cacheBuffer, offset, entryLen); | ||
| return entry; | ||
| } else { | ||
| return null; | ||
| } | ||
| } | ||
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| @Override | ||
| public int getSize() { | ||
| return currentOffset.get(); | ||
| } | ||
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| @Override | ||
| public void close() { | ||
| cacheBuffer.release(); | ||
| } | ||
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| private static int align64(int size) { | ||
| return (size + 64 - 1) & ALIGN_64_MASK; | ||
| } | ||
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| @Override | ||
| public void clear() { | ||
| index.clear(); | ||
| currentOffset.set(0); | ||
| } | ||
| } |
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