Please Visit: http://ift.tt/1ajReyV
from Public RSS-Feed of Jeffery yuan. Created with the PIXELMECHANICS 'GPlusRSS-Webtool' at http://gplusrss.com http://ift.tt/1FZw5MC
via LifeLong Community
Spark Gitbooks: Avoid GroupByKey
the reduceByKey example works much better on a large dataset. That's because Spark knows it can combine output with a common key on each partition before shuffling the data.
combineByKey can be used when you are combining elements but your return type differs from your input value type.
foldByKey merges the values for each key using an associative function and a neutral "zero value".
http://ift.tt/1FZw5wm
Job aborted due to stage failure: Task not serializable:
http://ift.tt/1GRkcvl
the reduceByKey example works much better on a large dataset. That's because Spark knows it can combine output with a common key on each partition before shuffling the data.
combineByKey can be used when you are combining elements but your return type differs from your input value type.
foldByKey merges the values for each key using an associative function and a neutral "zero value".
http://ift.tt/1FZw5wm
Job aborted due to stage failure: Task not serializable:
http://ift.tt/1GRkcvl
from Public RSS-Feed of Jeffery yuan. Created with the PIXELMECHANICS 'GPlusRSS-Webtool' at http://gplusrss.com http://ift.tt/1FZw5MC
via LifeLong Community
No comments:
Post a Comment