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https://issues.apache.org/jira/browse/SPARK-6831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14620811#comment-14620811
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Shivaram Venkataraman commented on SPARK-6831:
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[~yhuai] might be able to guide better, but what I had in mind was to add a 
table in http://spark.apache.org/docs/latest/sql-programming-guide.html that 
indicates how to read from popular data sources like Cassandra, Avro etc. 

> Document how to use external data sources
> -----------------------------------------
>
>                 Key: SPARK-6831
>                 URL: https://issues.apache.org/jira/browse/SPARK-6831
>             Project: Spark
>          Issue Type: Improvement
>          Components: Documentation, PySpark, SparkR, SQL
>            Reporter: Shivaram Venkataraman
>            Priority: Critical
>
> We should include some instructions on how to use an external datasource for 
> users who are beginners. Do they need to install it on all the machines ? Or 
> just the master ? Are there are any special flags they need to pass to 
> `bin/spark-submit` etc.



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