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https://issues.apache.org/jira/browse/PIG-1037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772410#action_12772410
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Ashutosh Chauhan commented on PIG-1037:
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I am kinda late on this, but I would appreciate if someone can provide brief
description of how this patch improves the memory layout and alleviates the
spill problem. I took a quick look at the patch.
According to my understanding, previously when memory is about to get exhausted
Pig will start writing to the disk one tuple at a time. With this new patch,
once the memory limit is hit whole bag is spilled to disk, at that point
in-memory bag contains no tuples. If in-memory bag fills again, all of its
content are spilled to disk in entirety again and so on.. So this patch ensures
that we are not spilling one tuple at a time, but a full bag a time. Is this
correct or am I missing something ?
> better memory layout and spill for sorted and distinct bags
> -----------------------------------------------------------
>
> Key: PIG-1037
> URL: https://issues.apache.org/jira/browse/PIG-1037
> Project: Pig
> Issue Type: Improvement
> Reporter: Olga Natkovich
> Assignee: Ying He
> Fix For: 0.6.0
>
> Attachments: PIG-1037.patch, PIG-1037.patch2, PIG-1037.patch3
>
>
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