[jira] [Created] (PIG-4782) OutOfMemoryError: GC overhead limit exceeded with POPartialAgg

["Rohini Palaniswamy (JIRA)" <ji...@apache.org>]

Rohini Palaniswamy created PIG-4782:
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             Summary: OutOfMemoryError: GC overhead limit exceeded with POPartialAgg
                 Key: PIG-4782
                 URL: https://issues.apache.org/jira/browse/PIG-4782
             Project: Pig
          Issue Type: Bug
            Reporter: Rohini Palaniswamy
            Assignee: Rohini Palaniswamy
             Fix For: 0.16.0


   In some cases, even though spill is triggered the main thread is still executing some user UDF which constructs a DataBag which requires lot of memory. Since we block on spill in POPartialAgg, there is kind of a deadlock as there is no memory for the user DataBag to grow and spill does not happen and job finally failing with OutOfMemoryError: GC overhead limit exceeded. So need to make POPartialAgg non-blocking so that the user DataBag can be spilled first for the code to reach POPartialAgg and spill.



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