public Set<TableName> getIncrementalBackupTableSet() throws IOException {
    return systemTable.getIncrementalBackupTableSet(backupInfo.getBackupRootDir());
  }
Return the current tables covered by incremental backup.
@return set of tableNames
@throws IOException exception
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/BackupManager.java