question: IgniteInternalFuture < ? > formatAsync ( ) { GridFutureAdapter < ? > fut = new GridFutureAdapter < > ( ) ; Thread t = new Thread ( new FormatRunnable ( fut ) , "igfs-format-" + cfg . getName ( ) + "-" + FORMAT_THREAD_IDX_GEN . incrementAndGet ( ) ) ; t . setDaemon ( true ) ; t . start ( ) ; return fut ; }
target:  Formats the file system removing all existing entries from it.