Straggler What is straggler in MapReduce? Nodes on which tasks take an unusually long time to finish It will Delay the job execution time Degrade the cluster throughput How to solve it peculative execution Slow task is backed up on an alternative machine with the hope that the backup one can finish fasterStraggler  What is straggler in MapReduce?  Nodes on which tasks take an unusually long time to finish  It will:  Delay the job execution time  Degrade the cluster throughput  How to solve it?  Speculative execution  Slow task is backed up on an alternative machine with the hope that the backup one can finish faster