G)Fault Tolerance Input error: bad records Map /Reduce functions sometimes fail for particular inputs Best solution is to debug &e fix but not always possible On segment fault Send udp packet to master from signal handler Include sequence number of record being processed skip bad records If master sees two failures for same record. next worker is told to skip the recordFault Tolerance 26 • Input error: bad records – Map/Reduce functions sometimes fail for particular inputs – Best solution is to debug & fix, but not always possible – On segment fault • Send UDP packet to master from signal handler • Include sequence number of record being processed – Skip bad records • If master sees two failures for same record, next worker is told to skip the record