I second knowing the use case for interest. I can imagine a case where knowledge of the RDD key distribution would help local computations, for relaticely few keys, but would be interested to hear your motive.
Essentially, are you trying to achieve what would be an all-reduce type operation in MPI? On Apr 28, 2016 9:08 PM, "Marcin Tustin" <mtus...@handybook.com> wrote: > Why would you ever need to do this? I'm genuinely curious. I view > collects as being solely for interactive work. > > On Thursday, April 28, 2016, <ioannis.deligian...@nomura.com> wrote: > >> Hi, >> >> >> >> It is a common pattern to process an RDD, collect (typically a subset) to >> the driver and then broadcast back. >> >> >> >> Adding an RDD method that can do that using the torrent broadcast >> mechanics would be much more efficient. In addition, it would not require >> the Driver to also utilize its Heap holding this broadcast. >> >> >> >> I guess this can become complicated if the resulting broadcast is >> required to keep lineage information, but assuming a torrent distribution, >> once the broadcast is synced then lineage would not be required. I’d also >> expect the call to rdd.brodcast to be an action that eagerly distributes >> the broadcast and returns when the operation has succeeded. >> >> >> >> Is this something that could be implemented or are there any reasons that >> prohibits this? >> >> >> >> Thanks >> >> Ioannis >> >> This e-mail (including any attachments) is private and confidential, may >> contain proprietary or privileged information and is intended for the named >> recipient(s) only. Unintended recipients are strictly prohibited from >> taking action on the basis of information in this e-mail and must contact >> the sender immediately, delete this e-mail (and all attachments) and >> destroy any hard copies. Nomura will not accept responsibility or liability >> for the accuracy or completeness of, or the presence of any virus or >> disabling code in, this e-mail. If verification is sought please request a >> hard copy. Any reference to the terms of executed transactions should be >> treated as preliminary only and subject to formal written confirmation by >> Nomura. Nomura reserves the right to retain, monitor and intercept e-mail >> communications through its networks (subject to and in accordance with >> applicable laws). No confidentiality or privilege is waived or lost by >> Nomura by any mistransmission of this e-mail. Any reference to "Nomura" is >> a reference to any entity in the Nomura Holdings, Inc. group. Please read >> our Electronic Communications Legal Notice which forms part of this e-mail: >> http://www.Nomura.com/email_disclaimer.htm >> > > Want to work at Handy? Check out our culture deck and open roles > <http://www.handy.com/careers> > Latest news <http://www.handy.com/press> at Handy > Handy just raised $50m > <http://venturebeat.com/2015/11/02/on-demand-home-service-handy-raises-50m-in-round-led-by-fidelity/> > led > by Fidelity > >
