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Apache ZooKeeper Server Source Code
Apache ZooKeeper is an open-source server which enables highly reliable distributed coordination.
Apache ZooKeeper Server Source Code files are provided in the source package file, apache-zookeeper-3.8.0.tar.gz.
You can download apache-zookeeper-3.8.0.tar.gz as described in the previous tutorial and go to the "zookeeper-server" sub-folder to view Apache ZooKeeper Server Source Code files.
You can also browse Apache ZooKeeper Server Source Code below:
✍: FYIcenter.com
⏎ org/apache/zookeeper/server/persistence/FilePadding.java
/* * 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.zookeeper.server.persistence; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class FilePadding { private static final Logger LOG; private static long preAllocSize = 65536 * 1024; private static final ByteBuffer fill = ByteBuffer.allocateDirect(1); static { LOG = LoggerFactory.getLogger(FileTxnLog.class); String size = System.getProperty("zookeeper.preAllocSize"); if (size != null) { try { preAllocSize = Long.parseLong(size) * 1024; } catch (NumberFormatException e) { LOG.warn("{} is not a valid value for preAllocSize", size); } } } private long currentSize; /** * Getter of preAllocSize has been added for testing */ public static long getPreAllocSize() { return preAllocSize; } /** * method to allow setting preallocate size * of log file to pad the file. * * @param size the size to set to in bytes */ public static void setPreallocSize(long size) { preAllocSize = size; } public void setCurrentSize(long currentSize) { this.currentSize = currentSize; } /** * pad the current file to increase its size to the next multiple of preAllocSize greater than the current size and position * * @param fileChannel the fileChannel of the file to be padded * @throws IOException */ long padFile(FileChannel fileChannel) throws IOException { long newFileSize = calculateFileSizeWithPadding(fileChannel.position(), currentSize, preAllocSize); if (currentSize != newFileSize) { fileChannel.write((ByteBuffer) fill.position(0), newFileSize - fill.remaining()); currentSize = newFileSize; } return currentSize; } /** * Calculates a new file size with padding. We only return a new size if * the current file position is sufficiently close (less than 4K) to end of * file and preAllocSize is > 0. * * @param position the point in the file we have written to * @param fileSize application keeps track of the current file size * @param preAllocSize how many bytes to pad * @return the new file size. It can be the same as fileSize if no * padding was done. */ // VisibleForTesting public static long calculateFileSizeWithPadding(long position, long fileSize, long preAllocSize) { // If preAllocSize is positive and we are within 4KB of the known end of the file calculate a new file size if (preAllocSize > 0 && position + 4096 >= fileSize) { // If we have written more than we have previously preallocated we need to make sure the new // file size is larger than what we already have if (position > fileSize) { fileSize = position + preAllocSize; fileSize -= fileSize % preAllocSize; } else { fileSize += preAllocSize; } } return fileSize; } }
⏎ org/apache/zookeeper/server/persistence/FilePadding.java
Or download all of them as a single archive file:
File name: zookeeper-server-3.8.0-fyi.zip File size: 885581 bytes Release date: 2022-02-25 Download
⇒ Apache ZooKeeper Jute Source Code
⇐ Download and Install Apache ZooKeeper Source Package
2022-11-16, 13125👍, 0💬
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