how often you use Tachyon to accelerate Spark

[Arvin]

Hi,all
 Well, I have some questions about Tachyon and Spark. I found the
interactive between Spark and Tachyon is the caching RDD use off-heap. I
wonder if you guys use Tachyon frequently, such caching RDD by Tachyon? Is
this action(caching rdd by tachyon) has a profound effect to accelerate
Spark? 



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Re: AnalysisException Handling for unspecified field in Spark SQL

[Arvin]

Hi,you can add a the new column to your DataFrame just before your query. The
added column will be null in your new table, so you can have what you want.



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