Ted - Thanks for the updates. Then its the same case with sc.parallelize()
or sc.makeRDD() right.
Thanks & Regards,
Gokula Krishnan* (Gokul)*
On Tue, Dec 29, 2015 at 1:43 PM, Ted Yu <yuzhih...@gmail.com> wrote:
> From RDD.scala :
>
> def ++(other: RDD[T]): RDD[T] = withScope {
> this.union(other)
>
> They should be the same.
>
> On Tue, Dec 29, 2015 at 10:41 AM, email2...@gmail.com <email2...@gmail.com
> > wrote:
>
>> Hello All -
>>
>> tried couple of operations by using ++ and union on RDD's but realized
>> that
>> the end results are same. Do you know any differences?.
>>
>> val odd_partA = List(1,3,5,7,9,11,1,3,5,7,9,11,1,3,5,7,9,11)
>> odd_partA: List[Int] = List(1, 3, 5, 7, 9, 11, 1, 3, 5, 7, 9, 11, 1, 3, 5,
>> 7, 9, 11)
>>
>> val odd_partB = List(1,3,13,15,9)
>> odd_partB: List[Int] = List(1, 3, 13, 15, 9)
>>
>> val odd_partC = List(15,9,1,3,13)
>> odd_partC: List[Int] = List(15, 9, 1, 3, 13)
>>
>> val odd_partA_RDD = sc.parallelize(odd_partA)
>> odd_partA_RDD: org.apache.spark.rdd.RDD[Int] = ParallelCollectionRDD[9] at
>> parallelize at <console>:17
>>
>> val odd_partB_RDD = sc.parallelize(odd_partB)
>> odd_partB_RDD: org.apache.spark.rdd.RDD[Int] = ParallelCollectionRDD[10]
>> at
>> parallelize at <console>:17
>>
>> val odd_partC_RDD = sc.parallelize(odd_partC)
>> odd_partC_RDD: org.apache.spark.rdd.RDD[Int] = ParallelCollectionRDD[11]
>> at
>> parallelize at <console>:17
>>
>> val odd_PARTAB_pp = odd_partA_RDD ++(odd_partB_RDD)
>> odd_PARTAB_pp: org.apache.spark.rdd.RDD[Int] = UnionRDD[12] at $plus$plus
>> at
>> <console>:23
>>
>> val odd_PARTAB_union = odd_partA_RDD.union(odd_partB_RDD)
>> odd_PARTAB_union: org.apache.spark.rdd.RDD[Int] = UnionRDD[13] at union at
>> <console>:23
>>
>> odd_PARTAB_pp.count
>> res8: Long = 23
>>
>> odd_PARTAB_union.count
>> res9: Long = 23
>>
>> val odd_PARTABC_pp = odd_partA_RDD ++(odd_partB_RDD) ++ (odd_partC_RDD)
>> odd_PARTABC_pp: org.apache.spark.rdd.RDD[Int] = UnionRDD[15] at $plus$plus
>> at <console>:27
>>
>> val odd_PARTABC_union =
>> odd_partA_RDD.union(odd_partB_RDD).union(odd_partC_RDD)
>> odd_PARTABC_union: org.apache.spark.rdd.RDD[Int] = UnionRDD[17] at union
>> at
>> <console>:27
>>
>> odd_PARTABC_pp.count
>> res10: Long = 28
>>
>> odd_PARTABC_union.count
>> res11: Long = 28
>>
>> Thanks
>> Gokul
>>
>>
>>
>> --
>> View this message in context:
>> http://apache-spark-user-list.1001560.n3.nabble.com/difference-between-and-Union-of-a-RDD-tp25830.html
>> Sent from the Apache Spark User List mailing list archive at Nabble.com.
>>
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>
