[jira] [Created] (SPARK-7716) SparkUI stage page hangs with many tasks

["Andrew Or (JIRA)" <ji...@apache.org>]

Andrew Or created SPARK-7716:
--------------------------------

             Summary: SparkUI stage page hangs with many tasks
                 Key: SPARK-7716
                 URL: https://issues.apache.org/jira/browse/SPARK-7716
             Project: Spark
          Issue Type: Bug
          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, 100000).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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