If multiple users are looking at the same data set, then it's good choice
to share the SparkContext.
But my usercases are different, users are looking at different data(I use
custom Hadoop InputFormat to load data from my data source based on the
user input), the data might not have any overlap. For now I'm taking below
approach
1. once my webapp receives the user request, it will submit custom
Yarn application to my Yarn cluster to allocate a container where a
SparkContext is created and my driver is running
2. I have to design a coordination/callback protocol so that user
session in my webapp can be notified when the Spark job is finished and the
result will be pushed back.
Let me know if you have any better solution
Thanks
On Fri, Dec 4, 2015 at 11:10 AM, Michael Armbrust <mich...@databricks.com>
wrote:
> To be clear, I don't think there is ever a compelling reason to create
> more than one SparkContext in a single application. The context is
> threadsafe and can launch many jobs in parallel from multiple threads.
> Even if there wasn't global state that made it unsafe to do so, creating
> more than one context creates an artificial barrier that prevents sharing
> of RDDs between the two.
>
> On Fri, Dec 4, 2015 at 10:47 AM, prateek arora <prateek.arora...@gmail.com
> > wrote:
>
>> Thanks ...
>>
>> Is there any way my second application run in parallel and wait for
>> fetching data from hbase or any other data storeage system ?
>>
>> Regards
>> Prateek
>>
>> On Fri, Dec 4, 2015 at 10:24 AM, Ted Yu <yuzhih...@gmail.com> wrote:
>>
>>> How about using NoSQL data store such as HBase :-)
>>>
>>> On Fri, Dec 4, 2015 at 10:17 AM, prateek arora <
>>> prateek.arora...@gmail.com> wrote:
>>>
>>>> Hi Ted
>>>> Thanks for the information .
>>>> is there any way that two different spark application share there data ?
>>>>
>>>> Regards
>>>> Prateek
>>>>
>>>> On Fri, Dec 4, 2015 at 9:54 AM, Ted Yu <yuzhih...@gmail.com> wrote:
>>>>
>>>>> See Josh's response in this thread:
>>>>>
>>>>>
>>>>> http://search-hadoop.com/m/q3RTt1z1hUw4TiG1&subj=Re+Question+about+yarn+cluster+mode+and+spark+driver+allowMultipleContexts
>>>>>
>>>>> Cheers
>>>>>
>>>>> On Fri, Dec 4, 2015 at 9:46 AM, prateek arora <
>>>>> prateek.arora...@gmail.com> wrote:
>>>>>
>>>>>> Hi
>>>>>>
>>>>>> I want to create multiple sparkContext in my application.
>>>>>> i read so many articles they suggest " usage of multiple contexts is
>>>>>> discouraged, since SPARK-2243 is still not resolved."
>>>>>> i want to know that Is spark 1.5.0 supported to create multiple
>>>>>> contexts
>>>>>> without error ?
>>>>>> and if supported then are we need to set
>>>>>> "spark.driver.allowMultipleContexts" configuration parameter ?
>>>>>>
>>>>>> Regards
>>>>>> Prateek
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> View this message in context:
>>>>>> http://apache-spark-user-list.1001560.n3.nabble.com/is-Multiple-Spark-Contexts-is-supported-in-spark-1-5-0-tp25568.html
>>>>>> Sent from the Apache Spark User List mailing list archive at
>>>>>> Nabble.com.
>>>>>>
>>>>>> ---------------------------------------------------------------------
>>>>>> To unsubscribe, e-mail: user-unsubscr...@spark.apache.org
>>>>>> For additional commands, e-mail: user-h...@spark.apache.org
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
--
--Anfernee
