Re: get host from rdd map
1. You can call any api that returns you the hostname in your map function. Here's a simplified example, You would generally use mapPartitions as it will save the overhead of retrieving hostname multiple times 2. 3. import scala.sys.process._ 4. val distinctHosts = sc.parallelize(0 to 100).map { _ => 5. val hostname = ("hostname".!!).trim 6. // your code 7. (hostname) 8. }.collect.distinct 9. On 24 October 2015 at 01:41, weocccwrote: > yea, > > my use cases is that i want to have some external communications where rdd > is being run in map. The external communication might be handled separately > transparent to spark. What will be the hacky way and nonhacky way to do > that ? :) > > Weide > > > > On Fri, Oct 23, 2015 at 5:32 PM, Ted Yu wrote: > >> Can you outline your use case a bit more ? >> >> Do you want to know all the hosts which would run the map ? >> >> Cheers >> >> On Fri, Oct 23, 2015 at 5:16 PM, weoccc wrote: >> >>> in rdd map function, is there a way i can know the list of host names >>> where the map runs ? any code sample would be appreciated ? >>> >>> thx, >>> >>> Weide >>> >>> >>> >> >
get host from rdd map
in rdd map function, is there a way i can know the list of host names where the map runs ? any code sample would be appreciated ? thx, Weide
Re: get host from rdd map
Can you outline your use case a bit more ? Do you want to know all the hosts which would run the map ? Cheers On Fri, Oct 23, 2015 at 5:16 PM, weocccwrote: > in rdd map function, is there a way i can know the list of host names > where the map runs ? any code sample would be appreciated ? > > thx, > > Weide > > >
Re: get host from rdd map
yea, my use cases is that i want to have some external communications where rdd is being run in map. The external communication might be handled separately transparent to spark. What will be the hacky way and nonhacky way to do that ? :) Weide On Fri, Oct 23, 2015 at 5:32 PM, Ted Yuwrote: > Can you outline your use case a bit more ? > > Do you want to know all the hosts which would run the map ? > > Cheers > > On Fri, Oct 23, 2015 at 5:16 PM, weoccc wrote: > >> in rdd map function, is there a way i can know the list of host names >> where the map runs ? any code sample would be appreciated ? >> >> thx, >> >> Weide >> >> >> >