VladRodionov commented on a change in pull request #623: HBASE-22749: Distributed MOB compactions URL: https://github.com/apache/hbase/pull/623#discussion_r336214069
########## File path: hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobUtils.java ########## @@ -907,6 +789,143 @@ public static boolean hasMobColumns(TableDescriptor htd) { return false; } + /** + * Get list of Mob column families (if any exists) + * @param htd table descriptor + * @return list of Mob column families + */ + public static List<ColumnFamilyDescriptor> getMobColumnFamilies(TableDescriptor htd){ + + List<ColumnFamilyDescriptor> fams = new ArrayList<ColumnFamilyDescriptor>(); + ColumnFamilyDescriptor[] hcds = htd.getColumnFamilies(); + for (ColumnFamilyDescriptor hcd : hcds) { + if (hcd.isMobEnabled()) { + fams.add(hcd); + } + } + return fams; + } + + /** + * Performs housekeeping file cleaning (called by MOB Cleaner chore) + * @param conf configuration + * @param table table name + * @throws IOException + */ + public static void cleanupObsoleteMobFiles(Configuration conf, TableName table) + throws IOException { + + try (final Connection conn = ConnectionFactory.createConnection(conf); + final Admin admin = conn.getAdmin();) { + TableDescriptor htd = admin.getDescriptor(table); + List<ColumnFamilyDescriptor> list = 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) { + //TODO handle FNFE + 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); + } + } + try { + for(Path pp: storeFiles) { + HStoreFile sf = new HStoreFile(fs, pp, conf, CacheConfig.DISABLED, + BloomType.NONE, true); + sf.initReader(); + byte[] mobRefData = sf.getMetadataValue(HStoreFile.MOB_FILE_REFS); + byte[] mobCellCountData = sf.getMetadataValue(HStoreFile.MOB_CELLS_COUNT); + byte[] bulkloadMarkerData = sf.getMetadataValue(HStoreFile.BULKLOAD_TASK_KEY); + if (mobRefData == null && (mobCellCountData != null || + bulkloadMarkerData == null)) { + LOG.info("Found old store file with no MOB_FILE_REFS: " + pp + +" - can not proceed until all old files will be MOB-compacted"); + return; + } else if (mobRefData == null) { + LOG.info("Skipping file without MOB references (can be bulkloaded file):"+ pp); + continue; + } + String[] mobs = new String(mobRefData).split(","); + regionMobs.addAll(Arrays.asList(mobs)); + } + } catch (FileNotFoundException e) { + //TODO + LOG.warn(e.getMessage()); + continue; + } + succeed = true; + } + // Add MOB refs for current region/family + allActiveMobFileName.addAll(regionMobs); + } // END column families + }//END regions + + // Now scan MOB directories and find MOB files with no references to them + long now = System.currentTimeMillis(); + long minAgeToArchive = conf.getLong(MobConstants.MOB_MINIMUM_FILE_AGE_TO_ARCHIVE_KEY, + MobConstants.DEFAULT_MOB_MINIMUM_FILE_AGE_TO_ARCHIVE); + for (ColumnFamilyDescriptor hcd: list) { + List<Path> toArchive = new ArrayList<Path>(); + String family = hcd.getNameAsString(); + Path dir = 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())) { Review comment: We do not have _del files anymore. All deletes are handled in a usual way during normal major compactions of a regular store files. This code just checks if MOB file is in a active set, if - not, then it is eligible for deletion (archiving) later on by MOB cleaning chore. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services