question: private void startFileBasedMerge ( ) throws CarbonSortKeyAndGroupByException { try { executorService . shutdown ( ) ; executorService . awaitTermination ( 2 , TimeUnit . DAYS ) ; dataSorterAndWriterExecutorService . shutdown ( ) ; dataSorterAndWriterExecutorService . awaitTermination ( 2 , TimeUnit . DAYS ) ; } catch ( InterruptedException e ) { throw new CarbonSortKeyAndGroupByException ( "Problem while shutdown the server " , e ) ; } }
target:  Below method will be used to start file based merge