GitHub user surq opened a pull request:
https://github.com/apache/spark/pull/3662
Print the specified number of data and handle all of the elements in RDD
Dstream.print function:Print 10 elements and handle 11 elements.
A new function based on Dstream.print function is presented:
the new function:
Print the specified number of data and handle all of the elements in RDD.
there is a work scene:
val dstream = stream.map->filter->mapPartitions->print
the data after filter need update database in mapPartitions,but don't need
print each data,only need to print the top 20 for view the data processing.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/surq/spark SPARK-4817
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3662.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3662
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commit 4e3f715941f94cb2467ca68b205a5fa3630130a3
Author: surq <[email protected]>
Date: 2014-12-10T10:49:54Z
Print the specified number of data and handle all of the elements in RDD
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