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JavaSparkContext not serializable


JavaSparkContext not serializable

By : npasto
Date : November 20 2020, 01:01 AM
it should still fix some issue No, JavaSparkContext is not serializable and is not supposed to be. It can't be used in a function you send to remote workers. Here you're not explicitly referencing it but a reference is being serialized anyway because your anonymous inner class function is not static and therefore has a reference to the enclosing class.
Try rewriting your code with this function as a static, stand-alone object.
code :


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How to get SparkContext from JavaSparkContext in PySpark?

How to get SparkContext from JavaSparkContext in PySpark?


By : user3061784
Date : March 29 2020, 07:55 AM
hop of those help? sc._jsc.sc() is the right way to access the underlying SparkContext. To illustrate:
code :
>>> sc._jsc.sc()
JavaObject id=o27
>>> sc._jsc.sc().version()
u'1.1.0'
>>> sc._jsc.sc().defaultMinSplits()
2
Is it possible to get and use a JavaSparkContext from within a task?

Is it possible to get and use a JavaSparkContext from within a task?


By : coffeedrunk
Date : March 29 2020, 07:55 AM
wish of those help
Is it possible to get and use a JavaSparkContext from within a task?
org.apache.spark.SparkException: Task not serializable - JavaSparkContext

org.apache.spark.SparkException: Task not serializable - JavaSparkContext


By : user3766173
Date : March 29 2020, 07:55 AM
like below fixes the issue The gson reference is 'pulling' the outer class into the scope of the closure, taking its full object graph with it.
In this case, create the gson object within the closure:
code :
public SupplierDTO call(String str) throws Exception {   
   Gson gson = Gson();
   return gson.fromJson(str, SupplierDTO.class);
}
Get JavaSparkContext from a SparkSession

Get JavaSparkContext from a SparkSession


By : Strawmelon
Date : March 29 2020, 07:55 AM
will help you Im am using a SparkSession to run my spark application because I use a lot of spark-sql features. I would like to use the JavaSparkContextto create an RDD from a list. But via the Session I can only get an ordinary SparkContext. Is there a way to transform the context in this direction? , After determining the SparkContext, you could use:
code :
SparkContext sc = ...
JavaSparkContext jsc = JavaSparkContext.fromSparkContext(sc);
System.out.println("Serializable: " + arrayList instanceof Serializable) is not printing 'Serializable' word

System.out.println("Serializable: " + arrayList instanceof Serializable) is not printing 'Serializable' word


By : user3687692
Date : March 29 2020, 07:55 AM
To fix the issue you can do I tried to execute following simple code. System.out.println() is not printing word 'Serializable:'. Output is true. , You are missing out a bracket. You should be writing like this :
code :
System.out.println("Serializable: " + (arrayList instanceof Serializable))
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