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From Akhil Das <ak...@sigmoidanalytics.com>
Subject Re: Error using collectAsMap() in scala
Date Mon, 21 Mar 2016 06:17:06 GMT
What you should be doing is a join, something like this:

//Create a key, value pair, key being the column1
val rdd1 = sc.textFile(file1).map(x => (x.split(",")(0),x.split(","))

//Create a key, value pair, key being the column2
val rdd2 = sc.textFile(file2).map(x => (x.split(",")(1),x.split(","))

//Now join the dataset
val joined = rdd1.join(rdd2)

//Now do the replacement
val replaced = joined.map(...)





Thanks
Best Regards

On Mon, Mar 21, 2016 at 10:31 AM, Shishir Anshuman <
shishiranshuman@gmail.com> wrote:

> I have stored the contents of two csv files in separate RDDs.
>
> file1.csv format*: (column1,column2,column3)*
> file2.csv format*: (column1, column2)*
>
> *column1 of file1 *and* column2 of file2 *contains similar data. I want
> to compare the two columns and if match is found:
>
>    - Replace the data at *column1(file1)* with the* column1(file2)*
>
>
> For this reason, I am not using normal RDD.
>
> I am still new to apache spark, so any suggestion will be greatly
> appreciated.
>
> On Mon, Mar 21, 2016 at 10:09 AM, Prem Sure <premsure542@gmail.com> wrote:
>
>> any specific reason you would like to use collectasmap only? You probably
>> move to normal RDD instead of a Pair.
>>
>>
>> On Monday, March 21, 2016, Mark Hamstra <mark@clearstorydata.com> wrote:
>>
>>> You're not getting what Ted is telling you.  Your `dict` is an
>>> RDD[String]  -- i.e. it is a collection of a single value type, String.
>>> But `collectAsMap` is only defined for PairRDDs that have key-value pairs
>>> for their data elements.  Both a key and a value are needed to collect into
>>> a Map[K, V].
>>>
>>> On Sun, Mar 20, 2016 at 8:19 PM, Shishir Anshuman <
>>> shishiranshuman@gmail.com> wrote:
>>>
>>>> yes I have included that class in my code.
>>>> I guess its something to do with the RDD format. Not able to figure out
>>>> the exact reason.
>>>>
>>>> On Fri, Mar 18, 2016 at 9:27 AM, Ted Yu <yuzhihong@gmail.com> wrote:
>>>>
>>>>> It is defined in:
>>>>> core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
>>>>>
>>>>> On Thu, Mar 17, 2016 at 8:55 PM, Shishir Anshuman <
>>>>> shishiranshuman@gmail.com> wrote:
>>>>>
>>>>>> I am using following code snippet in scala:
>>>>>>
>>>>>>
>>>>>> *val dict: RDD[String] = sc.textFile("path/to/csv/file")*
>>>>>> *val dict_broadcast=sc.broadcast(dict.collectAsMap())*
>>>>>>
>>>>>> On compiling It generates this error:
>>>>>>
>>>>>> *scala:42: value collectAsMap is not a member of
>>>>>> org.apache.spark.rdd.RDD[String]*
>>>>>>
>>>>>>
>>>>>> *val dict_broadcast=sc.broadcast(dict.collectAsMap())
>>>>>>                     ^*
>>>>>>
>>>>>
>>>>>
>>>>
>>>
>

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