thank you for your reply!
is unpersist operation lazy?if yes,how to decrease memory size as quickly as 
possible

> 在 Oct 20, 2014,21:26,"Nicholas Chammas" <nicholas.cham...@gmail.com> 写道:
> 
> I believe it won't show up there until you trigger an action that causes the 
> RDD to actually be cached. Remember that certain operations in Spark are 
> lazy, and caching is one of them.
> 
> Nick
> 
>> On Mon, Oct 20, 2014 at 9:19 AM, marylucy <qaz163wsx_...@hotmail.com> wrote:
>> in spark-shell,I do in follows
>>     val input = sc.textfile("hdfs://192.168.1.10/people/testinput/")
>>     input.cache()
>> 
>> In webui,I cannot see any rdd in storage tab.can anyone tell me how to show 
>> rdd size?thank you
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