Re: How to Map and Reduce in sparkR
The simple answer is that SparkR does support map/reduce operations over RDD’s through the RDD API, but since Spark v 1.4.0, those functions were made private in SparkR. They can still be accessed by prepending the function with the namespace, like SparkR:::lapply(rdd, func). It was thought though that many of the functions in the RDD API were too low level to expose, with much more of the focus going into the DataFrame API. The original rationale for this decision can be found in its JIRA [1]. The devs are still deciding which functions of the RDD API, if any, should be made public for future releases. If you feel some use cases are most easily handled in SparkR through RDD functions, go ahead and let the dev email list know. Alek [1] -- https://issues.apache.org/jira/browse/SPARK-7230 From: Wei Zhou zhweisop...@gmail.commailto:zhweisop...@gmail.com Date: Wednesday, June 24, 2015 at 4:59 PM To: user@spark.apache.orgmailto:user@spark.apache.org user@spark.apache.orgmailto:user@spark.apache.org Subject: How to Map and Reduce in sparkR Anyone knows whether sparkR supports map and reduce operations as the RDD transformations? Thanks in advance. Best, Wei CONFIDENTIALITY NOTICE This message and any included attachments are from Cerner Corporation and are intended only for the addressee. The information contained in this message is confidential and may constitute inside or non-public information under international, federal, or state securities laws. Unauthorized forwarding, printing, copying, distribution, or use of such information is strictly prohibited and may be unlawful. If you are not the addressee, please promptly delete this message and notify the sender of the delivery error by e-mail or you may call Cerner's corporate offices in Kansas City, Missouri, U.S.A at (+1) (816)221-1024.
Re: How to Map and Reduce in sparkR
In addition to Aleksander's point please let us know what use case would use RDD-like API in https://issues.apache.org/jira/browse/SPARK-7264 -- We are hoping to have a version of this API in upcoming releases. Thanks Shivaram On Thu, Jun 25, 2015 at 6:02 AM, Eskilson,Aleksander alek.eskil...@cerner.com wrote: The simple answer is that SparkR does support map/reduce operations over RDD’s through the RDD API, but since Spark v 1.4.0, those functions were made private in SparkR. They can still be accessed by prepending the function with the namespace, like SparkR:::lapply(rdd, func). It was thought though that many of the functions in the RDD API were too low level to expose, with much more of the focus going into the DataFrame API. The original rationale for this decision can be found in its JIRA [1]. The devs are still deciding which functions of the RDD API, if any, should be made public for future releases. If you feel some use cases are most easily handled in SparkR through RDD functions, go ahead and let the dev email list know. Alek [1] -- https://issues.apache.org/jira/browse/SPARK-7230 From: Wei Zhou zhweisop...@gmail.com Date: Wednesday, June 24, 2015 at 4:59 PM To: user@spark.apache.org user@spark.apache.org Subject: How to Map and Reduce in sparkR Anyone knows whether sparkR supports map and reduce operations as the RDD transformations? Thanks in advance. Best, Wei CONFIDENTIALITY NOTICE This message and any included attachments are from Cerner Corporation and are intended only for the addressee. The information contained in this message is confidential and may constitute inside or non-public information under international, federal, or state securities laws. Unauthorized forwarding, printing, copying, distribution, or use of such information is strictly prohibited and may be unlawful. If you are not the addressee, please promptly delete this message and notify the sender of the delivery error by e-mail or you may call Cerner's corporate offices in Kansas City, Missouri, U.S.A at (+1) (816)221-1024.
Re: How to Map and Reduce in sparkR
Hi Shivaram/Alek, I understand that a better way to import data is to DataFrame rather than RDD. If one wants to do a map-like transformation for such row in sparkR, one could use sparkR:::lapply(), but is there a counterpart row operation on DataFrame? The use case I am working on requires complicated row level pre-processing and then goes to the actually modeling. Thanks. Best, Wei 2015-06-25 9:25 GMT-07:00 Shivaram Venkataraman shiva...@eecs.berkeley.edu : In addition to Aleksander's point please let us know what use case would use RDD-like API in https://issues.apache.org/jira/browse/SPARK-7264 -- We are hoping to have a version of this API in upcoming releases. Thanks Shivaram On Thu, Jun 25, 2015 at 6:02 AM, Eskilson,Aleksander alek.eskil...@cerner.com wrote: The simple answer is that SparkR does support map/reduce operations over RDD’s through the RDD API, but since Spark v 1.4.0, those functions were made private in SparkR. They can still be accessed by prepending the function with the namespace, like SparkR:::lapply(rdd, func). It was thought though that many of the functions in the RDD API were too low level to expose, with much more of the focus going into the DataFrame API. The original rationale for this decision can be found in its JIRA [1]. The devs are still deciding which functions of the RDD API, if any, should be made public for future releases. If you feel some use cases are most easily handled in SparkR through RDD functions, go ahead and let the dev email list know. Alek [1] -- https://issues.apache.org/jira/browse/SPARK-7230 From: Wei Zhou zhweisop...@gmail.com Date: Wednesday, June 24, 2015 at 4:59 PM To: user@spark.apache.org user@spark.apache.org Subject: How to Map and Reduce in sparkR Anyone knows whether sparkR supports map and reduce operations as the RDD transformations? Thanks in advance. Best, Wei CONFIDENTIALITY NOTICE This message and any included attachments are from Cerner Corporation and are intended only for the addressee. The information contained in this message is confidential and may constitute inside or non-public information under international, federal, or state securities laws. Unauthorized forwarding, printing, copying, distribution, or use of such information is strictly prohibited and may be unlawful. If you are not the addressee, please promptly delete this message and notify the sender of the delivery error by e-mail or you may call Cerner's corporate offices in Kansas City, Missouri, U.S.A at (+1) (816)221-1024.
Re: How to Map and Reduce in sparkR
Thanks Shivaram. For those who prefer to watch the video version for the talk, like me, you can actually register for spark summit live stream 2015 free of cost. I personally find the talk extremely helpful. 2015-06-25 15:20 GMT-07:00 Shivaram Venkataraman shiva...@eecs.berkeley.edu : We don't support UDFs on DataFrames in SparkR in the 1.4 release. The existing functionality can be seen as a pre-processing step which you can do and then collect data back to the driver to do more complex processing. Along with the RDD API ticket, we are also working on UDF support. You can see the Spark summit talk slides from last week for a bigger picture view http://www.slideshare.net/SparkSummit/07-venkataraman-sun Thanks Shivaram On Thu, Jun 25, 2015 at 3:08 PM, Wei Zhou zhweisop...@gmail.com wrote: Hi Shivaram/Alek, I understand that a better way to import data is to DataFrame rather than RDD. If one wants to do a map-like transformation for such row in sparkR, one could use sparkR:::lapply(), but is there a counterpart row operation on DataFrame? The use case I am working on requires complicated row level pre-processing and then goes to the actually modeling. Thanks. Best, Wei 2015-06-25 9:25 GMT-07:00 Shivaram Venkataraman shiva...@eecs.berkeley.edu: In addition to Aleksander's point please let us know what use case would use RDD-like API in https://issues.apache.org/jira/browse/SPARK-7264 -- We are hoping to have a version of this API in upcoming releases. Thanks Shivaram On Thu, Jun 25, 2015 at 6:02 AM, Eskilson,Aleksander alek.eskil...@cerner.com wrote: The simple answer is that SparkR does support map/reduce operations over RDD’s through the RDD API, but since Spark v 1.4.0, those functions were made private in SparkR. They can still be accessed by prepending the function with the namespace, like SparkR:::lapply(rdd, func). It was thought though that many of the functions in the RDD API were too low level to expose, with much more of the focus going into the DataFrame API. The original rationale for this decision can be found in its JIRA [1]. The devs are still deciding which functions of the RDD API, if any, should be made public for future releases. If you feel some use cases are most easily handled in SparkR through RDD functions, go ahead and let the dev email list know. Alek [1] -- https://issues.apache.org/jira/browse/SPARK-7230 From: Wei Zhou zhweisop...@gmail.com Date: Wednesday, June 24, 2015 at 4:59 PM To: user@spark.apache.org user@spark.apache.org Subject: How to Map and Reduce in sparkR Anyone knows whether sparkR supports map and reduce operations as the RDD transformations? Thanks in advance. Best, Wei CONFIDENTIALITY NOTICE This message and any included attachments are from Cerner Corporation and are intended only for the addressee. The information contained in this message is confidential and may constitute inside or non-public information under international, federal, or state securities laws. Unauthorized forwarding, printing, copying, distribution, or use of such information is strictly prohibited and may be unlawful. If you are not the addressee, please promptly delete this message and notify the sender of the delivery error by e-mail or you may call Cerner's corporate offices in Kansas City, Missouri, U.S.A at (+1) (816)221-1024 .
