/*
* 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 extends 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());
}
}