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Posted to issues@spark.apache.org by "Davies Liu (JIRA)" <ji...@apache.org> on 2015/09/09 00:21:46 UTC

[jira] [Created] (SPARK-10494) Multiple Python UDFs together with aggregation or sort merge join may cause OOM (failed to acquire memory)

Davies Liu created SPARK-10494:
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             Summary: Multiple Python UDFs together with aggregation or sort merge join may cause OOM (failed to acquire memory)
                 Key: SPARK-10494
                 URL: https://issues.apache.org/jira/browse/SPARK-10494
             Project: Spark
          Issue Type: Bug
          Components: PySpark, SQL
    Affects Versions: 1.5.0
            Reporter: Davies Liu
            Priority: Critical


The RDD cache for Python UDF is removed in 1.4, then N Python UDFs in one query stage could end up evaluate upstream (SparkPlan) 2^N times.

In 1.5, If there is aggregation or sort merge join in upstream SparkPlan, they will cause OOM (failed to acquire memory).



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