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https://issues.apache.org/jira/browse/SPARK-22584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16264447#comment-16264447
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Derek M Miller commented on SPARK-22584:
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I disagree. I should not be running out of memory for a file that only has 6mb
with 5 instances that have 16gb of memory. Even when the data is evenly
distributed across partitions, I am still seeing this issue. I posted this on
stackoverflow, and it seems like others are experiencing this issue as well
https://stackoverflow.com/questions/47382977/spark-2-2-write-partitionby-out-of-memory-exception.
> dataframe write partitionBy out of disk/java heap issues
> --------------------------------------------------------
>
> Key: SPARK-22584
> URL: https://issues.apache.org/jira/browse/SPARK-22584
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Derek M Miller
>
> I have been seeing some issues with partitionBy for the dataframe writer. I
> currently have a file that is 6mb, just for testing, and it has around 1487
> rows and 21 columns. There is nothing out of the ordinary with the columns,
> having either a DoubleType or StringType. The partitionBy calls two different
> partitions with verified low cardinality. One partition has 30 unique values
> and the other one has 2 unique values.
> ```scala
> df
> .write.partitionBy("first", "second")
> .mode(SaveMode.Overwrite)
> .parquet(s"$location$example/$corrId/")
> ```
> When running this example on Amazon's EMR with 5 r4.xlarges (30 gb of memory
> each), I am getting a java heap out of memory error. I have
> maximizeResourceAllocation set, and verified on the instances. I have even
> set it to false, explicitly set the driver and executor memory to 16g, but
> still had the same issue. Occasionally I get an error about disk space, and
> the job seems to work if I use an r3.xlarge (that has the ssd). But that
> seems weird that 6mb of data needs to spill to disk.
> The problem mainly seems to be centered around two + partitions vs 1. If I
> just use either of the partitions only, I have no problems. It's also worth
> noting that each of the partitions are evenly distributed.
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