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https://issues.apache.org/jira/browse/HIVE-352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12701074#action_12701074
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Zheng Shao commented on HIVE-352:
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Yongqiang talked with me offline since 1 conflicts with Joydeep's earlier
comment: "We have seen that having a number of open codecs can hurt in memory
usage - that's one open question for me - can we actually afford to open N
concurrent compressed streams (assuming each column is stored compressed
separately)."
I think we should do an experiment to see how much memory each concurrent
compressing stream takes - in reality, most tables will have less than 100
columns, so I guess if each codec takes 100K-500K memory it's affordable (total
memory usage: 10MB-50MB), otherwise we need to rethink about 1. I
> Make Hive support column based storage
> --------------------------------------
>
> Key: HIVE-352
> URL: https://issues.apache.org/jira/browse/HIVE-352
> Project: Hadoop Hive
> Issue Type: New Feature
> Reporter: He Yongqiang
> Assignee: He Yongqiang
> Attachments: hive-352-2009-4-15.patch, hive-352-2009-4-16.patch,
> hive-352-2009-4-17.patch, hive-352-2009-4-19.patch,
> HIve-352-draft-2009-03-28.patch, Hive-352-draft-2009-03-30.patch
>
>
> column based storage has been proven a better storage layout for OLAP.
> Hive does a great job on raw row oriented storage. In this issue, we will
> enhance hive to support column based storage.
> Acctually we have done some work on column based storage on top of hdfs, i
> think it will need some review and refactoring to port it to Hive.
> Any thoughts?
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