Re: Performing sc.paralleize (..) in workers not in the driver program
Why do you want to do that? Thanks Best Regards On Thu, Jun 25, 2015 at 10:16 PM, shahab shahab.mok...@gmail.com wrote: Hi, Apparently, sc.paralleize (..) operation is performed in the driver program not in the workers ! Is it possible to do this in worker process for the sake of scalability? best /Shahab
RE: Performing sc.paralleize (..) in workers not in the driver program
This is how it works, I think: sc.parallelize(..) takes the variable inside the (..) and returns a “distributable equivalent” of that variable. That is, an RDD is returned. This RDD can be worked on by multiple workers threads in _parallel_. The parallelize(..) has to be done on the driver running on the Master(and not on workers), so that the resulting RDD’s parts can be sent across to the workers who have enough resources. Each worker processes a part of the RDD. So it is the “sc.paralleize (..) operation is performed in the driver program” that enables scalability. Horizontal scalablity. From: Akhil Das [mailto:ak...@sigmoidanalytics.com] Sent: 26 June 2015 13:33 To: shahab Cc: user@spark.apache.org Subject: Re: Performing sc.paralleize (..) in workers not in the driver program Why do you want to do that? Thanks Best Regards On Thu, Jun 25, 2015 at 10:16 PM, shahab shahab.mok...@gmail.commailto:shahab.mok...@gmail.com wrote: Hi, Apparently, sc.paralleize (..) operation is performed in the driver program not in the workers ! Is it possible to do this in worker process for the sake of scalability? best /Shahab The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com
RE: Performing sc.paralleize (..) in workers not in the driver program
The parallelize operation accepts as input a data structure in memory. When you call it, you are necessarily operating In the memory space of the driver since that is where user code executes. Until you have an RDD, you can't really operate in a distributed way. If your files are stores in a distributed file system such as HDFS then you can create an RDD from those directly with sc.textFile(...). Thank you, Ilya Ganelin -Original Message- From: shahab [shahab.mok...@gmail.commailto:shahab.mok...@gmail.com] Sent: Thursday, June 25, 2015 12:46 PM Eastern Standard Time To: user@spark.apache.org Subject: Performing sc.paralleize (..) in workers not in the driver program Hi, Apparently, sc.paralleize (..) operation is performed in the driver program not in the workers ! Is it possible to do this in worker process for the sake of scalability? best /Shahab The information contained in this e-mail is confidential and/or proprietary to Capital One and/or its affiliates and may only be used solely in performance of work or services for Capital One. The information transmitted herewith is intended only for use by the individual or entity to which it is addressed. If the reader of this message is not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying or other use of, or taking of any action in reliance upon this information is strictly prohibited. If you have received this communication in error, please contact the sender and delete the material from your computer.
