| /** |
| * |
| * 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.hadoop.hbase.regionserver; |
| |
| import static org.apache.hadoop.hbase.regionserver.StripeStoreFileManager.OPEN_KEY; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hbase.CellComparator; |
| import org.apache.hadoop.hbase.monitoring.MonitoredTask; |
| import org.apache.hadoop.hbase.regionserver.compactions.StripeCompactionPolicy; |
| import org.apache.hadoop.hbase.regionserver.throttle.ThroughputController; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Stripe implementation of StoreFlusher. Flushes files either into L0 file w/o metadata, or |
| * into separate striped files, avoiding L0. |
| */ |
| @InterfaceAudience.Private |
| public class StripeStoreFlusher extends StoreFlusher { |
| private static final Logger LOG = LoggerFactory.getLogger(StripeStoreFlusher.class); |
| private final Object flushLock = new Object(); |
| private final StripeCompactionPolicy policy; |
| private final StripeCompactionPolicy.StripeInformationProvider stripes; |
| |
| public StripeStoreFlusher(Configuration conf, HStore store, |
| StripeCompactionPolicy policy, StripeStoreFileManager stripes) { |
| super(conf, store); |
| this.policy = policy; |
| this.stripes = stripes; |
| } |
| |
| @Override |
| public List<Path> flushSnapshot(MemStoreSnapshot snapshot, long cacheFlushSeqNum, |
| MonitoredTask status, ThroughputController throughputController, |
| FlushLifeCycleTracker tracker) throws IOException { |
| List<Path> result = new ArrayList<>(); |
| int cellsCount = snapshot.getCellsCount(); |
| if (cellsCount == 0) return result; // don't flush if there are no entries |
| |
| InternalScanner scanner = createScanner(snapshot.getScanners(), tracker); |
| |
| // Let policy select flush method. |
| StripeFlushRequest req = this.policy.selectFlush(store.getComparator(), this.stripes, |
| cellsCount); |
| |
| boolean success = false; |
| StripeMultiFileWriter mw = null; |
| try { |
| mw = req.createWriter(); // Writer according to the policy. |
| StripeMultiFileWriter.WriterFactory factory = createWriterFactory(cellsCount); |
| StoreScanner storeScanner = (scanner instanceof StoreScanner) ? (StoreScanner)scanner : null; |
| mw.init(storeScanner, factory); |
| |
| synchronized (flushLock) { |
| performFlush(scanner, mw, throughputController); |
| result = mw.commitWriters(cacheFlushSeqNum, false); |
| success = true; |
| } |
| } finally { |
| if (!success && (mw != null)) { |
| for (Path leftoverFile : mw.abortWriters()) { |
| try { |
| store.getFileSystem().delete(leftoverFile, false); |
| } catch (Exception e) { |
| LOG.error("Failed to delete a file after failed flush: " + e); |
| } |
| } |
| } |
| try { |
| scanner.close(); |
| } catch (IOException ex) { |
| LOG.warn("Failed to close flush scanner, ignoring", ex); |
| } |
| } |
| return result; |
| } |
| |
| private StripeMultiFileWriter.WriterFactory createWriterFactory(final long kvCount) { |
| return new StripeMultiFileWriter.WriterFactory() { |
| @Override |
| public StoreFileWriter createWriter() throws IOException { |
| StoreFileWriter writer = store.createWriterInTmp(kvCount, |
| store.getColumnFamilyDescriptor().getCompressionType(), false, true, true, false); |
| return writer; |
| } |
| }; |
| } |
| |
| /** Stripe flush request wrapper that writes a non-striped file. */ |
| public static class StripeFlushRequest { |
| |
| protected final CellComparator comparator; |
| |
| public StripeFlushRequest(CellComparator comparator) { |
| this.comparator = comparator; |
| } |
| |
| public StripeMultiFileWriter createWriter() throws IOException { |
| StripeMultiFileWriter writer = new StripeMultiFileWriter.SizeMultiWriter(comparator, 1, |
| Long.MAX_VALUE, OPEN_KEY, OPEN_KEY); |
| writer.setNoStripeMetadata(); |
| return writer; |
| } |
| } |
| |
| /** Stripe flush request wrapper based on boundaries. */ |
| public static class BoundaryStripeFlushRequest extends StripeFlushRequest { |
| private final List<byte[]> targetBoundaries; |
| |
| /** @param targetBoundaries New files should be written with these boundaries. */ |
| public BoundaryStripeFlushRequest(CellComparator comparator, List<byte[]> targetBoundaries) { |
| super(comparator); |
| this.targetBoundaries = targetBoundaries; |
| } |
| |
| @Override |
| public StripeMultiFileWriter createWriter() throws IOException { |
| return new StripeMultiFileWriter.BoundaryMultiWriter(comparator, targetBoundaries, null, |
| null); |
| } |
| } |
| |
| /** Stripe flush request wrapper based on size. */ |
| public static class SizeStripeFlushRequest extends StripeFlushRequest { |
| private final int targetCount; |
| private final long targetKvs; |
| |
| /** |
| * @param targetCount The maximum number of stripes to flush into. |
| * @param targetKvs The KV count of each segment. If targetKvs*targetCount is less than |
| * total number of kvs, all the overflow data goes into the last stripe. |
| */ |
| public SizeStripeFlushRequest(CellComparator comparator, int targetCount, long targetKvs) { |
| super(comparator); |
| this.targetCount = targetCount; |
| this.targetKvs = targetKvs; |
| } |
| |
| @Override |
| public StripeMultiFileWriter createWriter() throws IOException { |
| return new StripeMultiFileWriter.SizeMultiWriter(comparator, this.targetCount, this.targetKvs, |
| OPEN_KEY, OPEN_KEY); |
| } |
| } |
| } |