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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-4782) OutOfMemoryError: GC overhead limit exceeded with POPartialAgg
Date Mon, 01 Feb 2016 08:52:39 GMT

    [ https://issues.apache.org/jira/browse/PIG-4782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15125956#comment-15125956

Daniel Dai commented on PIG-4782:

+1 for PIG-4782-2-fixslowness.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, PIG-4782-2-fixslowness.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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