# Calling esRDD in a transformation method causes Task not serializable **URL:** \ **Category:** Elasticsearch\ **Tags:** es-hadoop\ **Created:** [January 26, 2016, 1:52am UTC](https://discuss.elastic.co/t/calling-esrdd-in-a-transformation-method-causes-task-not-serializable/40078 "2016-01-26T01:52:35Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![costin](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/costin/32/44950_2.png) [@costin](https://discuss.elastic.co/u/costin)\ **Post date:** [January 27, 2016, 8:38pm UTC](https://discuss.elastic.co/t/calling-esrdd-in-a-transformation-method-causes-task-not-serializable/40078/2 "2016-01-27T20:38:12Z")
As I've mentioned in another [thread](https://discuss.elastic.co/t/esrdd-not-returning-script-fields-values/40077/2), you are being quite cryptic in your questions so it's hard to understand what the issue is. Task not serializable it's a common issue in Spark cause by the fact that you are passing around code which is not serializable. And yes, nesting an `RDD` of any kind qualify as such - take a look into the Spark docs, it's easy to get around it by keeping the data point outside your code and trying to leverage as much as possible the `RDD` functions. Note that an `RDD` is a distributed collection in the end - it acts like one but it's actually a proxy to a distributed job. --- _[View the full topic](https://discuss.elastic.co/t/calling-esrdd-in-a-transformation-method-causes-task-not-serializable/40078)._