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https://issues.apache.org/jira/browse/SPARK-19046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15791468#comment-15791468
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Assaf Mendelson commented on SPARK-19046:
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This is an easily created example. I see a factor of ~10 in real life data as
well compared to parquet file and compared to memory.
In fact I got better performance (as well as disk space) by simply saving the
dataframe to parquet and reloading.
> Dataset checkpoint consumes too much disk space
> -----------------------------------------------
>
> Key: SPARK-19046
> URL: https://issues.apache.org/jira/browse/SPARK-19046
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Assaf Mendelson
>
> Consider the following simple example:
> val df = spark.range(100000000)
> df.cache()
> df.count()
> df.checkpoint()
> df.write.parquet("/test1")
> Looking at the storage tab of the UI, the dataframe takes 97.5 MB.
> Looking at the checkpoint directory, the checkpoint takes 3.3GB (33 times
> larger!)
> Looking at the parquet directory, the dataframe takes 386MB
> Similar behavior can be seen on less synthetic examples.
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