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https://issues.apache.org/jira/browse/SPARK-20227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15956973#comment-15956973
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Quentin Auge edited comment on SPARK-20227 at 4/5/17 2:51 PM:
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I managed to get is working using either of the following workarounds:
* Quite unsatisfactory: persist df after the for loop
* Better: eplacing the for loop with the following:
{code}
df = df.select([cols[0]] + [sum(col).over(window).alias(col) for col in
cols[1:]])
{code}
was (Author: quentin):
I manages to get is working using either of the following workarounds:
* Quite unsatisfactory: persist df after the for loop
* Better: eplacing the for loop with the following:
{code}
df = df.select([cols[0]] + [sum(col).over(window).alias(col) for col in
cols[1:]])
{code}
> Job hangs when joining a lot of aggregated columns
> --------------------------------------------------
>
> Key: SPARK-20227
> URL: https://issues.apache.org/jira/browse/SPARK-20227
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0
> Environment: AWS emr-5.4.0 m4.xlarge
> Reporter: Quentin Auge
>
> I'm trying to replace a lot of different columns in a dataframe with
> aggregates of themselves, and then join the resulting dataframe.
> {code}
> # Create a dataframe with 1 row and 50 columns
> n = 50
> df = sc.parallelize([Row(*range(n))]).toDF()
> cols = df.columns
> # Replace each column values with aggregated values
> window = Window.partitionBy(cols[0])
> for col in cols[1:]:
> df = df.withColumn(col, sum(col).over(window))
> # Join
> other_df = sc.parallelize([Row(0)]).toDF()
> result = other_df.join(df, on = cols[0])
> result.show()
> {code}
> The issue is, Spark hangs forever when executing the last line.
> {code}
> 17/04/05 14:39:28 INFO ExecutorAllocationManager: Removing executor 1 because
> it has been idle for 60 seconds (new desired total will be 0)
> 17/04/05 14:39:29 INFO YarnSchedulerBackend$YarnDriverEndpoint: Disabling
> executor 1.
> 17/04/05 14:39:29 INFO DAGScheduler: Executor lost: 1 (epoch 0)
> 17/04/05 14:39:29 INFO BlockManagerMasterEndpoint: Trying to remove executor
> 1 from BlockManagerMaster.
> 17/04/05 14:39:29 INFO BlockManagerMasterEndpoint: Removing block manager
> BlockManagerId(1, ip-172-30-0-149.ec2.internal, 35666, None)
> 17/04/05 14:39:29 INFO BlockManagerMaster: Removed 1 successfully in
> removeExecutor
> 17/04/05 14:39:29 INFO YarnScheduler: Executor 1 on
> ip-172-30-0-149.ec2.internal killed by driver.
> 17/04/05 14:39:29 INFO ExecutorAllocationManager: Existing executor 1 has
> been removed (new total is 0)
> {code}
> All executors are inactive and thus killed after 60 seconds, the master
> spends some CPU on a process that hangs indefinitely, and the workers are
> idle.
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