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

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

     [ https://issues.apache.org/jira/browse/PIG-4782?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rohini Palaniswamy updated PIG-4782:
------------------------------------
    Attachment: PIG-4782-1.patch

> 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
>
>         Attachments: PIG-4782-1.patch
>
>
>    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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