xiangfu0 commented on code in PR #10528: URL: https://github.com/apache/pinot/pull/10528#discussion_r1208386539
########## pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/memory/unsafe/MmapMemory.java: ########## @@ -0,0 +1,348 @@ +/** + * 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.pinot.segment.spi.memory.unsafe; + +import com.google.common.collect.Lists; +import java.io.File; +import java.io.IOException; +import java.io.RandomAccessFile; +import java.io.UncheckedIOException; +import java.lang.reflect.InvocationTargetException; +import java.lang.reflect.Method; +import java.nio.channels.FileChannel; +import java.util.List; +import java.util.function.BiConsumer; +import net.openhft.chronicle.core.Jvm; +import net.openhft.chronicle.core.OS; +import net.openhft.posix.MSyncFlag; +import net.openhft.posix.PosixAPI; +import org.apache.pinot.segment.spi.utils.JavaVersion; + + +public class MmapMemory implements Memory { + + private static final MapFun MAP_FUN; + + /** + * The address actually mapped. It has to be page aligned. + * + * {@code _address = _offset - offset % pageSize} + */ + private final long _address; + /** + * The offset requested to map. + * + * {@code _address = _offset - offset % pageSize} + */ + private final long _offset; + /** + * How many bytes have been requested to be mapped. + * The actual mapped size may be larger (up to the next page), but the actual mapped size + * is stored by {@link #_section}. + */ + private final long _size; + private final MapSection _section; + + static { + try { + Jvm.init(); + MAP_FUN = MapFun.find(); + } catch (ClassNotFoundException | NoSuchMethodException e) { + throw new RuntimeException(e); + } + } + + public MmapMemory(File file, boolean readOnly, long offset, long size) { + _size = size; + _offset = offset; + + try { + _section = MAP_FUN.map(file, readOnly, offset, size); + } catch (IOException e) { + throw new RuntimeException(e); + } + _address = _section.getAddress(); + } + + @Override + public long getAddress() { + return _address; + } + + @Override + public long getSize() { + return _size; + } + + @Override + public void flush() { + MSyncFlag mode = MSyncFlag.MS_SYNC; + PosixAPI.posix().msync(_offset, _size, mode); Review Comment: This is not a blocker for java 17 upgrade effort, we can revisit this later. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For additional commands, e-mail: commits-h...@pinot.apache.org
