What is the difference between Rack-local map tasks and Data-local map tasks?

2012-10-07 Thread centerqi hu
hi all When I run hadoop job -status xxx,Output the following some list. Rack-local map tasks=124 Data-local map tasks=6 What is the difference between Rack-local map tasks and Data-local map tasks? -- cente...@gmail.com|Sam

Re: What is the difference between Rack-local map tasks and Data-local map tasks?

2012-10-07 Thread Bejoy KS
Subject: Re: What is the difference between Rack-local map tasks and Data-local map tasks? Very good explanation, If there is a way to reduce Rack-local map tasks but can increase the Data-local map tasks , Whether to increase performance？ 2012/10/7 Michael Segel michael_se...@hotmail.com Rack

Re: What is the difference between Rack-local map tasks and Data-local map tasks?

2012-10-07 Thread paritosh ranjan
Data-local map tasks=6 What is the difference between Rack-local map tasks and Data-local map tasks? -- cente...@gmail.com|Sam -- cente...@gmail.com|齐忠 -- Bertrand Dechoux

Re: What is the difference between Rack-local map tasks and Data-local map tasks?

2012-10-07 Thread Michael Segel
. HTH -Mike On Oct 7, 2012, at 8:56 AM, centerqi hu cente...@gmail.com wrote: hi all When I run hadoop job -status xxx,Output the following some list. Rack-local map tasks=124 Data-local map tasks=6 What is the difference between Rack-local map tasks and Data-local map tasks

Re: What is the difference between Rack-local map tasks and Data-local map tasks?

2012-10-07 Thread Bertrand Dechoux
that contains the actual data. HTH -Mike On Oct 7, 2012, at 8:56 AM, centerqi hu cente...@gmail.com wrote: hi all When I run hadoop job -status xxx,Output the following some list. Rack-local map tasks=124 Data-local map tasks=6 What is the difference between Rack-local map tasks