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/*
 * 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.wal;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Map;
import java.util.NavigableMap;
import java.util.function.Function;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl;
import org.apache.hadoop.hbase.util.CommonFSUtils;
import org.apache.hadoop.hbase.wal.WAL;
import org.apache.hadoop.hbase.wal.WALEdit;
import org.apache.hadoop.hbase.wal.WALKeyImpl;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hbase.thirdparty.com.google.protobuf.TextFormat;
import org.apache.hadoop.hbase.shaded.protobuf.generated.WALProtos;
import org.apache.hadoop.hbase.shaded.protobuf.generated.WALProtos.CompactionDescriptor;
import org.apache.hadoop.hbase.shaded.protobuf.generated.WALProtos.FlushDescriptor;
import org.apache.hadoop.hbase.shaded.protobuf.generated.WALProtos.RegionEventDescriptor;

/**
 * Helper methods to ease Region Server integration with the Write Ahead Log (WAL).
 * Note that methods in this class specifically should not require access to anything
 * other than the API found in {@link WAL}. For internal use only.
 */
@InterfaceAudience.Private
public class WALUtil {
  private static final Logger LOG = LoggerFactory.getLogger(WALUtil.class);

  public static final String WAL_BLOCK_SIZE = "hbase.regionserver.hlog.blocksize";

  private WALUtil() {
    // Shut down construction of this class.
  }

  /**
   * Write the marker that a compaction has succeeded and is about to be committed. This provides
   * info to the HMaster to allow it to recover the compaction if this regionserver dies in the
   * middle. It also prevents the compaction from finishing if this regionserver has already lost
   * its lease on the log.
   * 

* This write is for internal use only. Not for external client consumption. * @param mvcc Used by WAL to get sequence Id for the waledit. */ public static WALKeyImpl writeCompactionMarker(WAL wal, NavigableMap replicationScope, RegionInfo hri, final CompactionDescriptor c, MultiVersionConcurrencyControl mvcc) throws IOException { WALKeyImpl walKey = writeMarker(wal, replicationScope, hri, WALEdit.createCompaction(hri, c), mvcc, null); if (LOG.isTraceEnabled()) { LOG.trace("Appended compaction marker " + TextFormat.shortDebugString(c)); } return walKey; } /** * Write a flush marker indicating a start / abort or a complete of a region flush *

* This write is for internal use only. Not for external client consumption. */ public static WALKeyImpl writeFlushMarker(WAL wal, NavigableMap replicationScope, RegionInfo hri, final FlushDescriptor f, boolean sync, MultiVersionConcurrencyControl mvcc) throws IOException { WALKeyImpl walKey = doFullMarkerAppendTransaction(wal, replicationScope, hri, WALEdit.createFlushWALEdit(hri, f), mvcc, null, sync); if (LOG.isTraceEnabled()) { LOG.trace("Appended flush marker " + TextFormat.shortDebugString(f)); } return walKey; } /** * Write a region open marker indicating that the region is opened. This write is for internal use * only. Not for external client consumption. */ public static WALKeyImpl writeRegionEventMarker(WAL wal, NavigableMap replicationScope, RegionInfo hri, RegionEventDescriptor r, MultiVersionConcurrencyControl mvcc) throws IOException { WALKeyImpl walKey = writeMarker(wal, replicationScope, hri, WALEdit.createRegionEventWALEdit(hri, r), mvcc, null); if (LOG.isTraceEnabled()) { LOG.trace("Appended region event marker " + TextFormat.shortDebugString(r)); } return walKey; } /** * Write a log marker that a bulk load has succeeded and is about to be committed. * This write is for internal use only. Not for external client consumption. * @param wal The log to write into. * @param replicationScope The replication scope of the families in the HRegion * @param hri A description of the region in the table that we are bulk loading into. * @param desc A protocol buffers based description of the client's bulk loading request * @return walKey with sequenceid filled out for this bulk load marker * @throws IOException We will throw an IOException if we can not append to the HLog. */ public static WALKeyImpl writeBulkLoadMarkerAndSync(final WAL wal, final NavigableMap replicationScope, final RegionInfo hri, final WALProtos.BulkLoadDescriptor desc, final MultiVersionConcurrencyControl mvcc) throws IOException { WALKeyImpl walKey = writeMarker(wal, replicationScope, hri, WALEdit.createBulkLoadEvent(hri, desc), mvcc, null); if (LOG.isTraceEnabled()) { LOG.trace("Appended Bulk Load marker " + TextFormat.shortDebugString(desc)); } return walKey; } private static WALKeyImpl writeMarker(final WAL wal, NavigableMap replicationScope, RegionInfo hri, WALEdit edit, MultiVersionConcurrencyControl mvcc, Map extendedAttributes) throws IOException { // If sync == true in below, then timeout is not used; safe to pass UNSPECIFIED_TIMEOUT return doFullMarkerAppendTransaction(wal, replicationScope, hri, edit, mvcc, extendedAttributes, true); } /** * A 'full' WAL transaction involves starting an mvcc transaction followed by an append, an * optional sync, and then a call to complete the mvcc transaction. This method does it all. Good * for case of adding a single edit or marker to the WAL. *

* This write is for internal use only. Not for external client consumption. * @return WALKeyImpl that was added to the WAL. */ private static WALKeyImpl doFullMarkerAppendTransaction(WAL wal, NavigableMap replicationScope, RegionInfo hri, final WALEdit edit, MultiVersionConcurrencyControl mvcc, Map extendedAttributes, boolean sync) throws IOException { // TODO: Pass in current time to use? WALKeyImpl walKey = new WALKeyImpl(hri.getEncodedNameAsBytes(), hri.getTable(), System.currentTimeMillis(), mvcc, replicationScope, extendedAttributes); long trx = MultiVersionConcurrencyControl.NONE; try { trx = wal.appendMarker(hri, walKey, edit); if (sync) { wal.sync(trx); } // Call complete only here because these are markers only. They are not for clients to read. mvcc.complete(walKey.getWriteEntry()); } catch (IOException ioe) { if (walKey.getWriteEntry() != null) { mvcc.complete(walKey.getWriteEntry()); } throw ioe; } return walKey; } /** * Blocksize returned here is 2x the default HDFS blocksize unless explicitly set in * Configuration. Works in tandem with hbase.regionserver.logroll.multiplier. See comment in * AbstractFSWAL in Constructor where we set blocksize and logrollsize for why. * @return Blocksize to use writing WALs. */ public static long getWALBlockSize(Configuration conf, FileSystem fs, Path dir) throws IOException { return getWALBlockSize(conf, fs, dir, false); } /** * Public because of FSHLog. Should be package-private * @param isRecoverEdits the created writer is for recovered edits or WAL. For recovered edits, it * is true and for WAL it is false. */ public static long getWALBlockSize(Configuration conf, FileSystem fs, Path dir, boolean isRecoverEdits) throws IOException { long defaultBlockSize = CommonFSUtils.getDefaultBlockSize(fs, dir) * 2; if (isRecoverEdits) { return conf.getLong("hbase.regionserver.recoverededits.blocksize", defaultBlockSize); } return conf.getLong(WAL_BLOCK_SIZE, defaultBlockSize); } public static void filterCells(WALEdit edit, Function mapper) { ArrayList cells = edit.getCells(); int size = cells.size(); int newSize = 0; for (int i = 0; i < size; i++) { Cell cell = mapper.apply(cells.get(i)); if (cell != null) { cells.set(newSize, cell); newSize++; } } for (int i = size - 1; i >= newSize; i--) { cells.remove(i); } if (newSize < size / 2) { cells.trimToSize(); } } }





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