question: private static CopyState readCopyState ( DataInput in ) throws IOException { byte [ ] infosBytes = new byte [ in . readVInt ( ) ] ; in . readBytes ( infosBytes , 0 , infosBytes . length ) ; long gen = in . readVLong ( ) ; long version = in . readVLong ( ) ; Map < String , FileMetaData > files = CopyFilesHandler . readFilesMetaData ( in ) ; int count = in . readVInt ( ) ; Set < String > completedMergeFiles = new HashSet < > ( ) ; for ( int i = 0 ; i < count ; i ++ ) { completedMergeFiles . add ( in . readString ( ) ) ; } long primaryGen = in . readVLong ( ) ; return new CopyState ( files , version , gen , infosBytes , completedMergeFiles , primaryGen , null ) ; }
target:  Pulls CopyState off the wire 