Re: Help Required on Spark - Convert DataFrame to List with out using collect

Hi Sunitha, Make the class which is having the common function your calling as serializable. Thank you, Naresh On Wed, Dec 20, 2017 at 9:58 PM Sunitha Chennareddy < chennareddysuni...@gmail.com> wrote: > Hi, > > Thank You All.. > > Here is my requirement, I have a dataframe which contains

Re: Help Required on Spark - Convert DataFrame to List with out using collect

Hi, Thank You All.. Here is my requirement, I have a dataframe which contains list of rows retrieved from oracle table. I need to iterate dataframe and fetch each record and call a common function by passing few parameters. Issue I am facing is : I am not able to call common function JavaRDD

Re: Help Required on Spark - Convert DataFrame to List with out using collect

Hi Sunitha, In the mapper function, you cannot update outer variables such as `personLst.add(person)`, this won't work so that's the reason you got an empty list. You can use `rdd.collect()` to get a local list of `Person` objects first, then you can safely iterate on the local list and do any

Re: Help Required on Spark - Convert DataFrame to List with out using collect

Hi Jorn, In my case I have to call common interface function by passing the values of each rdd. So I have tried iterating , but I was not able to trigger common function from call method as commented in the snippet code in my earlier mail. Request you please share your views. Regards Sunitha

Re: Help Required on Spark - Convert DataFrame to List with out using collect

This is correct behavior. If you need to call another method simply append another map, flatmap or whatever you need. Depending on your use case you may use also reduce and reduce by key. However you never (!) should use a global variable as in your snippet. This can to work because you work in

Re: Help Required on Spark - Convert DataFrame to List with out using collect

Hi Deepak, I am able to map row to person class, issue is I want to to call another method. I tried converting to list and its not working with out using collect. Regards Sunitha On Tuesday, December 19, 2017, Deepak Sharma wrote: > I am not sure about java but in scala

Re: Help Required on Spark - Convert DataFrame to List with out using collect

I am not sure about java but in scala it would be something like df.rdd.map{ x => MyClass(x.getString(0),.)} HTH --Deepak On Dec 19, 2017 09:25, "Sunitha Chennareddy" wrote: Hi All, I am new to Spark, I want to convert DataFrame to List with out using

Help Required on Spark - Convert DataFrame to List with out using collect

Hi All, I am new to Spark, I want to convert DataFrame to List with out using collect(). Main requirement is I need to iterate through the rows of dataframe and call another function by passing column value of each row (person.getId()) Here is the snippet I have tried, Kindly help me to resolve