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From Mayur Rustagi <mayur.rust...@gmail.com>
Subject Re: Callbacks on freeing up of RDDs
Date Wed, 02 Jul 2014 06:42:23 GMT
A lot of RDD that you create in Code may not even be constructed as the
tasks layer is optimized in the DAG scheduler.. The closest is onUnpersistRDD
in SparkListner.

Mayur Rustagi
Ph: +1 (760) 203 3257
http://www.sigmoidanalytics.com
@mayur_rustagi <https://twitter.com/mayur_rustagi>



On Mon, Jun 30, 2014 at 4:48 PM, Jaideep Dhok <jaideep.dhok@inmobi.com>
wrote:

> Hi all,
> I am trying to create a custom RDD class for result set of queries
> supported in InMobi Grill (http://inmobi.github.io/grill/)
>
> Each result set has a schema (similar to Hive's TableSchema) and a path in
> HDFS containing the result set data.
>
> An easy way of doing this would be to create a temp table in Hive, and use
> HCatInputFormat to create an RDD using the newAPIHadoopRDD call. I've
> already done this and it works.
>
> However, I also want to *delete* the temp table when the RDD is
> unpersisted, or when the SparkContext is gone. How could I do that in Spark?
>
> Does Spark allow users to register code to be executed when an RDD is
> freed? Something like the OutputCommitter in Hadoop?
>
> Thanks,
> Jaideep
>
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