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https://issues.apache.org/jira/browse/SPARK-7716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14619185#comment-14619185
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Apache Spark commented on SPARK-7716:
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User 'andrewor14' has created a pull request for this issue:
https://github.com/apache/spark/pull/7296
> SparkUI stage page hangs with many tasks
> ----------------------------------------
>
> Key: SPARK-7716
> URL: https://issues.apache.org/jira/browse/SPARK-7716
> Project: Spark
> Issue Type: Sub-task
> Components: Web UI
> Affects Versions: 1.4.0
> Reporter: Andrew Or
> Assignee: Andrew Or
> Priority: Critical
>
> While running the following, I checked the stage page on the SparkUI:
> {code}
> sc.parallelize(1 to 5000, 10000).count()
> {code}
> Then I get
> {code}
> HTTP ERROR 500
> Problem accessing /stages/stage/. Reason:
> Server Error
> Caused by:
> java.lang.OutOfMemoryError: Java heap space
> at java.util.Arrays.copyOf(Arrays.java:2367)
> at
> java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:130)
> at
> java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:114)
> at
> java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:587)
> at java.lang.StringBuilder.append(StringBuilder.java:214)
> {code}
> This is because end up concatenating all the scala XML nodes into raw strings
> and shipping them to the UI through Jetty. The long-term correct fix would be
> to add pagination, but even adding a compression layer will fix this for most
> cases.
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