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https://issues.apache.org/jira/browse/PIG-1501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12896993#action_12896993
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Alan Gates commented on PIG-1501:
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It's not surprising that RCFile performs badly here, since in every case every
column in the row is used. This is known to be a bad use case for columnar
storage. While for some data sets the better compression may overcome this, I
suspect that in the general case the stitching costs will overwhelm any
compression wins (as shown here).
I'm +1 with going with lzo/Tfile. As the lzo libs are GPL we cannot ship with
that as default. I wasn't clear from your last comment which you were
proposing as the default.
> need to investigate the impact of compression on pig performance
> ----------------------------------------------------------------
>
> Key: PIG-1501
> URL: https://issues.apache.org/jira/browse/PIG-1501
> Project: Pig
> Issue Type: Test
> Reporter: Olga Natkovich
> Assignee: Yan Zhou
> Fix For: 0.8.0
>
> Attachments: compress_perf_data.txt, compress_perf_data_2.txt
>
>
> We would like to understand how compressing map results as well as well as
> reducer output in a chain of MR jobs impacts performance. We can use PigMix
> queries for this investigation.
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