Since the data block must be fetched across the network to be processed, that single map task could seriously slow down the data processing if any part of the network between those two VM's is congested.
"I am anticipating similar or even slightly higher wave heights tomorrow, due to the combination of different atmospheric pressure systems and the long fetch across the Atlantic in which the waves can build up".
Therefore, after the first batch of map tasks finish, all the reduce tasks would be running and fetching remote data across network.
That skill came in handy after the storm, when Midnight was a link in a one-dog, multiperson bucket brigade, fetching bottles of water across Washington Street to carry to people marooned in the Westbeth complex, an apartment block that had gone dry as a desert.
Back in Memphis all hell breaks loose at this news, and Moses finds himself exiled into a trackless desert, where he just happens to run across a fetching nomadic shepherdess named Zipporah (Spanish actress Maria Valverde) and ends up a happily married husband and father.
Fetching little pieces from across various parts of the aircraft is not only impractical, but will likely result in embarrassment for you and loud noise from an upset child.
For both regulatory and technological reasons, Musk's fantasy of drivers fetching their autonomous cars from across the country by 2018 seems unlikely.
"I almost saw Almanzo driving out to fetch you home across the endless snow.
She was like a Chinese water torture, nagging away, "I saw you look at this woman, I saw you look at that woman", and he'd fetch her one across the mouth as he drove the family saloon on some unthrilling outing, so there'd be blood all over the upholstery.
A badly chosen row key could spread the data across the HTable and make fetching of the data time consuming and result in poor performance.
