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Re: Spark Code to read RCFiles - Spark - [mail # user]
...Is your file managed by Hive (and thus present in a Hive metastore)? In that case, Spark SQL (https://spark.apache.org/docs/latest/sql-programming-guide.html) is the easiest way.MateiOn Sept...
   Author: Matei Zaharia, 2014-09-24, 00:24
Re: Possibly a dumb question: differences between saveAsNewAPIHadoopFile and saveAsNewAPIHadoopDataset? - Spark - [mail # user]
...File takes a filename to write to, while Dataset takes only a JobConf. This means that Dataset is more general (it can also save to storage systems that are not file systems, such as key-val...
   Author: Matei Zaharia, 2014-09-22, 08:12
[expand - 1 more] - Re: A couple questions about shared variables - Spark - [mail # dev]
...Hmm, good point, this seems to have been broken by refactorings of the scheduler, but it worked in the past. Basically the solution is simple -- in a result stage, we should not apply the up...
   Author: Matei Zaharia, 2014-09-21, 22:36
Re: paging through an RDD that's too large to collect() all at once - Spark - [mail # user]
...Hey Dave, try out RDD.toLocalIterator -- it gives you an iterator that reads one RDD partition at a time. Scala iterators also have methods like grouped() that let you get fixed-size groups....
   Author: Matei Zaharia, 2014-09-19, 03:26
Re: Short Circuit Local Reads - Spark - [mail # user]
...I'm pretty sure it does help, though I don't have any numbers for it. In any case, Spark will automatically benefit from this if you link it to a version of HDFS that contains this.MateiOn S...
   Author: Matei Zaharia, 2014-09-17, 18:19
Re: Spark as a Library - Spark - [mail # user]
...If you want to run the computation on just one machine (using Spark's local mode), it can probably run in a container. Otherwise you can create a SparkContext there and connect it to a clust...
   Author: Matei Zaharia, 2014-09-16, 17:31
Re: Complexity/Efficiency of SortByKey - Spark - [mail # user]
...sortByKey is indeed O(n log n), it's a first pass to figure out even-sized partitions (by sampling the RDD), then a second pass to do a distributed merge-sort (first partition the data on ea...
   Author: Matei Zaharia, 2014-09-16, 05:56
[expand - 1 more] - Re: NullWritable not serializable - Spark - [mail # dev]
...Can you post the exact code for the test that worked in 1.0? I can't think of much that could've changed. The one possibility is if  we had some operations that were computed locally on the ...
   Author: Matei Zaharia, 2014-09-16, 05:52
Re: Does Spark always wait for stragglers to finish running? - Spark - [mail # user]
...It's true that it does not send a kill command right now -- we should probably add that. This code was written before tasks were killable AFAIK. However, the *job* should still finish while ...
   Author: Matei Zaharia, 2014-09-16, 01:10
[expand - 1 more] - Re: scala 2.11? - Spark - [mail # user]
...I think the current plan is to put it in 1.2.0, so that's what I meant by "soon". It might be possible to backport it too, but I'd be hesitant to do that as a maintenance release on 1.1.x an...
   Author: Matei Zaharia, 2014-09-16, 00:20
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