| /* |
| * 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.lucene.replicator.nrt; |
| |
| /** A merged segment warmer that pre-copies the merged segment out to |
| * replicas before primary cuts over to the merged segment. This |
| * ensures that NRT reopen time on replicas is only in proportion to |
| * flushed segment sizes, not merged segments. */ |
| |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.Locale; |
| import java.util.Map; |
| |
| import org.apache.lucene.index.IndexWriter.IndexReaderWarmer; |
| import org.apache.lucene.index.LeafReader; |
| import org.apache.lucene.index.SegmentCommitInfo; |
| import org.apache.lucene.index.SegmentReader; |
| |
| // TODO: or ... replica node can do merging locally? tricky to keep things in sync, when one node merges more slowly than others... |
| |
| class PreCopyMergedSegmentWarmer implements IndexReaderWarmer { |
| |
| private final PrimaryNode primary; |
| |
| public PreCopyMergedSegmentWarmer(PrimaryNode primary) { |
| this.primary = primary; |
| } |
| |
| @Override |
| public void warm(LeafReader reader) throws IOException { |
| long startNS = System.nanoTime(); |
| final SegmentCommitInfo info = ((SegmentReader) reader).getSegmentInfo(); |
| //System.out.println("TEST: warm merged segment files " + info); |
| Map<String,FileMetaData> filesMetaData = new HashMap<>(); |
| for (String fileName : info.files()) { |
| FileMetaData metaData = primary.readLocalFileMetaData(fileName); |
| assert metaData != null; |
| assert filesMetaData.containsKey(fileName) == false; |
| filesMetaData.put(fileName, metaData); |
| } |
| |
| primary.preCopyMergedSegmentFiles(info, filesMetaData); |
| primary.message(String.format(Locale.ROOT, "top: done warm merge " + info + ": took %.3f sec, %.1f MB", (System.nanoTime()-startNS)/1000000000., info.sizeInBytes()/1024/1024.)); |
| primary.finishedMergedFiles.addAll(filesMetaData.keySet()); |
| } |
| } |