busbey commented on a change in pull request #921: HBASE-22749: Distributed MOB compactions URL: https://github.com/apache/hbase/pull/921#discussion_r366427054
########## File path: hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobFileCleanerChore.java ########## @@ -0,0 +1,310 @@ +/** + * 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.mob; + +import java.io.FileNotFoundException; +import java.io.IOException; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.TimeUnit; + +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.fs.FileSystem; +import org.apache.hadoop.fs.LocatedFileStatus; +import org.apache.hadoop.fs.Path; +import org.apache.hadoop.fs.RemoteIterator; +import org.apache.hadoop.hbase.ScheduledChore; +import org.apache.hadoop.hbase.TableDescriptors; +import org.apache.hadoop.hbase.TableName; +import org.apache.hadoop.hbase.backup.HFileArchiver; +import org.apache.hadoop.hbase.client.Admin; +import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor; +import org.apache.hadoop.hbase.client.Connection; +import org.apache.hadoop.hbase.client.ConnectionFactory; +import org.apache.hadoop.hbase.client.TableDescriptor; +import org.apache.hadoop.hbase.io.hfile.CacheConfig; +import org.apache.hadoop.hbase.master.HMaster; +import org.apache.hadoop.hbase.regionserver.BloomType; +import org.apache.hadoop.hbase.regionserver.HStoreFile; +import org.apache.hadoop.hbase.util.EnvironmentEdgeManager; +import org.apache.hadoop.hbase.util.FSUtils; +import org.apache.yetus.audience.InterfaceAudience; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting; + +/** + * The class MobFileCleanerChore for running cleaner regularly to remove the expired + * and obsolete (files which have no active references to) mob files. + */ +@SuppressWarnings("deprecation") +@InterfaceAudience.Private +public class MobFileCleanerChore extends ScheduledChore { + + private static final Logger LOG = LoggerFactory.getLogger(MobFileCleanerChore.class); + private final HMaster master; + private ExpiredMobFileCleaner cleaner; + + static { + Configuration.addDeprecation(MobConstants.DEPRECATED_MOB_CLEANER_PERIOD, + MobConstants.MOB_CLEANER_PERIOD); + } + + public MobFileCleanerChore(HMaster master) { + super(master.getServerName() + "-ExpiredMobFileCleanerChore", master, + master.getConfiguration().getInt(MobConstants.MOB_CLEANER_PERIOD, + MobConstants.DEFAULT_MOB_CLEANER_PERIOD), + master.getConfiguration().getInt(MobConstants.MOB_CLEANER_PERIOD, + MobConstants.DEFAULT_MOB_CLEANER_PERIOD), + TimeUnit.SECONDS); + this.master = master; + cleaner = new ExpiredMobFileCleaner(); + cleaner.setConf(master.getConfiguration()); + checkObsoleteConfigurations(); + } + + private void checkObsoleteConfigurations() { + Configuration conf = master.getConfiguration(); + + if (conf.get("hbase.mob.compaction.mergeable.threshold") != null) { + LOG.warn("'hbase.mob.compaction.mergeable.threshold' is obsolete and not used anymore."); + } + if (conf.get("hbase.mob.delfile.max.count") != null) { + LOG.warn("'hbase.mob.delfile.max.count' is obsolete and not used anymore."); + } + if (conf.get("hbase.mob.compaction.threads.max") != null) { + LOG.warn("'hbase.mob.compaction.threads.max' is obsolete and not used anymore."); + } + if (conf.get("hbase.mob.compaction.batch.size") != null) { + LOG.warn("'hbase.mob.compaction.batch.size' is obsolete and not used anymore."); + } + } + + @VisibleForTesting + public MobFileCleanerChore() { + this.master = null; + } + + @Override + @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "REC_CATCH_EXCEPTION", + justification = "Intentional") + + protected void chore() { + TableDescriptors htds = master.getTableDescriptors(); + + Map<String, TableDescriptor> map = null; + try { + map = htds.getAll(); + } catch (IOException e) { + LOG.error("MobFileCleanerChore failed", e); + return; + } + for (TableDescriptor htd : map.values()) { + for (ColumnFamilyDescriptor hcd : htd.getColumnFamilies()) { + if (hcd.isMobEnabled() && hcd.getMinVersions() == 0) { + try { + cleaner.cleanExpiredMobFiles(htd.getTableName().getNameAsString(), hcd); + } catch (IOException e) { + LOG.error("Failed to clean the expired mob files table=" + htd.getTableName() + + " family=" + hcd.getNameAsString(), e); + } + } + } + try { + // Now clean obsolete files for a table + LOG.info("Cleaning obsolete MOB files from table={}", htd.getTableName()); + cleanupObsoleteMobFiles(master.getConfiguration(), htd.getTableName()); + LOG.info("Cleaning obsolete MOB files finished for table={}", htd.getTableName()); + } catch (IOException e) { + LOG.error("Failed to clean the obsolete mob files for table=" + htd.getTableName(), e); + } + } + } + + /** + * Performs housekeeping file cleaning (called by MOB Cleaner chore) + * @param conf configuration + * @param table table name + * @throws IOException exception + */ + public void cleanupObsoleteMobFiles(Configuration conf, TableName table) throws IOException { + + long minAgeToArchive = + conf.getLong(MobConstants.MIN_AGE_TO_ARCHIVE_KEY, MobConstants.DEFAULT_MIN_AGE_TO_ARCHIVE); + // We check only those MOB files, which creation time is less + // than maxCreationTimeToArchive. This is a current time - 1h. 1 hour gap + // gives us full confidence that all corresponding store files will + // exist at the time cleaning procedure begins and will be examined. + // So, if MOB file creation time is greater than this maxTimeToArchive, + // this will be skipped and won't be archived. + long maxCreationTimeToArchive = EnvironmentEdgeManager.currentTime() - minAgeToArchive; + LOG.info("Only MOB files whose creation time older than {} will be archived", + maxCreationTimeToArchive); + try (final Connection conn = ConnectionFactory.createConnection(conf); + final Admin admin = conn.getAdmin();) { + TableDescriptor htd = admin.getDescriptor(table); + List<ColumnFamilyDescriptor> list = MobUtils.getMobColumnFamilies(htd); + if (list.size() == 0) { + LOG.info("Skipping non-MOB table [{}]", table); + return; + } + + Path rootDir = FSUtils.getRootDir(conf); + Path tableDir = FSUtils.getTableDir(rootDir, table); + // How safe is this call? + List<Path> regionDirs = FSUtils.getRegionDirs(FileSystem.get(conf), tableDir); + + Set<String> allActiveMobFileName = new HashSet<String>(); + FileSystem fs = FileSystem.get(conf); + for (Path regionPath : regionDirs) { + for (ColumnFamilyDescriptor hcd : list) { + String family = hcd.getNameAsString(); + Path storePath = new Path(regionPath, family); + boolean succeed = false; + Set<String> regionMobs = new HashSet<String>(); + while (!succeed) { + if (!fs.exists(storePath)) { + LOG.warn("Directory {} was deleted during cleaner procedure execution," + +" skipping.", storePath); + break; + } + RemoteIterator<LocatedFileStatus> rit = fs.listLocatedStatus(storePath); + List<Path> storeFiles = new ArrayList<Path>(); + // Load list of store files first + while (rit.hasNext()) { + Path p = rit.next().getPath(); + if (fs.isFile(p)) { + storeFiles.add(p); + } + } + LOG.info("Found {} store files in: {}", storeFiles.size(), storePath); + try { + for (Path pp : storeFiles) { + LOG.debug("Store file: {}", pp); + HStoreFile sf = + new HStoreFile(fs, pp, conf, CacheConfig.DISABLED, BloomType.NONE, true); + sf.initReader(); + byte[] mobRefData = sf.getMetadataValue(HStoreFile.MOB_FILE_REFS); + byte[] bulkloadMarkerData = sf.getMetadataValue(HStoreFile.BULKLOAD_TASK_KEY); + // close store file to avoid memory leaks + sf.closeStoreFile(true); + if (mobRefData == null && bulkloadMarkerData == null) { + LOG.warn("Found old store file with no MOB_FILE_REFS: {} - " + + "can not proceed until all old files will be MOB-compacted.", + pp); + return; + } else if (mobRefData == null && bulkloadMarkerData != null) { + LOG.debug("Skipping file without MOB references (bulkloaded file):{}", pp); + continue; + } + // mobRefData will never be null here, but to make FindBugs happy + if (mobRefData != null && mobRefData.length > 1) { + // if length = 1 means NULL, that there are no MOB references + // in this store file, but the file was created by new MOB code + String[] mobs = new String(mobRefData).split(","); + if (LOG.isTraceEnabled()) { + LOG.debug("Found: {} mob references: {}", mobs.length, Arrays.toString(mobs)); + } else { + LOG.debug("Found: {} mob references", mobs.length); + } + regionMobs.addAll(Arrays.asList(mobs)); + } + } + } catch (FileNotFoundException e) { + LOG.warn("Starting MOB cleaning cycle from the beginning due to error", e); + continue; + } + succeed = true; + } + // Add MOB refs for current region/family + allActiveMobFileName.addAll(regionMobs); + } // END column families + } // END regions + // Check if number of MOB files too big (over 1M) + if (allActiveMobFileName.size() > 1000000) { + LOG.warn("Found too many active MOB files: {}, this may result in high memory pressure.", + allActiveMobFileName.size()); + } + LOG.debug("Found: {} active mob refs", allActiveMobFileName.size()); + allActiveMobFileName.stream().forEach(LOG::trace); + + // Now scan MOB directories and find MOB files with no references to them + for (ColumnFamilyDescriptor hcd : list) { + List<Path> toArchive = new ArrayList<Path>(); + String family = hcd.getNameAsString(); + Path dir = MobUtils.getMobFamilyPath(conf, table, family); + RemoteIterator<LocatedFileStatus> rit = fs.listLocatedStatus(dir); + while (rit.hasNext()) { + LocatedFileStatus lfs = rit.next(); + Path p = lfs.getPath(); + if (!allActiveMobFileName.contains(p.getName())) { + // MOB is not in a list of active references, but it can be too + // fresh, skip it in this case + long creationTime = fs.getFileStatus(p).getModificationTime(); + if (creationTime < maxCreationTimeToArchive) { + LOG.debug("Archiving MOB file {} creation time={}", p, + (fs.getFileStatus(p).getModificationTime())); + toArchive.add(p); + } else { + LOG.debug("Skipping fresh file: {}", p); + } + } else { + LOG.debug("Keeping active MOB file: {}", p); + } + } + LOG.info(" MOB Cleaner found {} files to archive for table={} family={}", + toArchive.size(), table, family); + removeMobFiles(conf, table, family.getBytes(), toArchive); + LOG.info(" MOB Cleaner archived {} files, table={} family={}", + toArchive.size(), table, family); + } + } + } + + /** + * Archives the mob files. + * @param conf The current configuration. + * @param tableName The table name. + * @param family The name of the column family. + * @param storeFiles The files to be archived. + * @throws IOException exception + */ + public void removeMobFiles(Configuration conf, TableName tableName, byte[] family, + List<Path> storeFiles) throws IOException { + + if (storeFiles.size() == 0) { + // nothing to remove + LOG.debug("Skipping archiving old MOB files - no files found."); 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