You can try setting "mapred.map.tasks" to get Hive to do the right thing.
On Sun, May 25, 2014 at 7:27 PM, qingyang li <liqingyang1...@gmail.com>wrote: > Hi, Aaron, thanks for sharing. > > I am using shark to execute query , and table is created on tachyon. I > think i can not using RDD#repartition() in shark CLI; > if shark support "SET mapred.max.split.size" to control file size ? > if yes, after i create table, i can control file num, then I can > control task number. > if not , do anyone know other way to control task number in shark CLI? > > > 2014-05-26 9:36 GMT+08:00 Aaron Davidson <ilike...@gmail.com>: > > How many partitions are in your input data set? A possibility is that your >> input data has 10 unsplittable files, so you end up with 10 partitions. You >> could improve this by using RDD#repartition(). >> >> Note that mapPartitionsWithIndex is sort of the "main processing loop" >> for many Spark functions. It is iterating through all the elements of the >> partition and doing some computation (probably running your user code) on >> it. >> >> You can see the number of partitions in your RDD by visiting the Spark >> driver web interface. To access this, visit port 8080 on host running your >> Standalone Master (assuming you're running standalone mode), which will >> have a link to the application web interface. The Tachyon master also has a >> useful web interface, available at port 19999. >> >> >> On Sun, May 25, 2014 at 5:43 PM, qingyang li <liqingyang1...@gmail.com>wrote: >> >>> hi, Mayur, thanks for replying. >>> I know spark application should take all cores by default. My question >>> is how to set task number on each core ? >>> If one silce, one task, how can i set silce file size ? >>> >>> >>> 2014-05-23 16:37 GMT+08:00 Mayur Rustagi <mayur.rust...@gmail.com>: >>> >>> How many cores do you see on your spark master (8080 port). >>>> By default spark application should take all cores when you launch it. >>>> Unless you have set max core configuration. >>>> >>>> >>>> Mayur Rustagi >>>> Ph: +1 (760) 203 3257 >>>> http://www.sigmoidanalytics.com >>>> @mayur_rustagi <https://twitter.com/mayur_rustagi> >>>> >>>> >>>> >>>> On Thu, May 22, 2014 at 4:07 PM, qingyang li >>>> <liqingyang1...@gmail.com>wrote: >>>> >>>>> my aim of setting task number is to increase the query speed, and I >>>>> have also found " mapPartitionsWithIndex at >>>>> Operator.scala:333<http://192.168.1.101:4040/stages/stage?id=17>" >>>>> is costing much time. so, my another question is : >>>>> how to tunning >>>>> mapPartitionsWithIndex<http://192.168.1.101:4040/stages/stage?id=17> >>>>> to make the costing time down? >>>>> >>>>> >>>>> >>>>> >>>>> 2014-05-22 18:09 GMT+08:00 qingyang li <liqingyang1...@gmail.com>: >>>>> >>>>> i have added SPARK_JAVA_OPTS+="-Dspark. >>>>>> default.parallelism=40 " in shark-env.sh, >>>>>> but i find there are only10 tasks on the cluster and 2 tasks each >>>>>> machine. >>>>>> >>>>>> >>>>>> 2014-05-22 18:07 GMT+08:00 qingyang li <liqingyang1...@gmail.com>: >>>>>> >>>>>> i have added SPARK_JAVA_OPTS+="-Dspark.default.parallelism=40 " in >>>>>>> shark-env.sh >>>>>>> >>>>>>> >>>>>>> 2014-05-22 17:50 GMT+08:00 qingyang li <liqingyang1...@gmail.com>: >>>>>>> >>>>>>> i am using tachyon as storage system and using to shark to query a >>>>>>>> table which is a bigtable, i have 5 machines as a spark cluster, there >>>>>>>> are >>>>>>>> 4 cores on each machine . >>>>>>>> My question is: >>>>>>>> 1. how to set task number on each core? >>>>>>>> 2. where to see how many partitions of one RDD? >>>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> >
