public HashMap<String, Long> readRegionServerLastLogRollResult() throws IOException {
    return systemTable.readRegionServerLastLogRollResult(backupInfo.getBackupRootDir());
  }
Get the RS log information after the last log roll from backup system table.
@return RS log info
@throws IOException exception
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/BackupManager.java