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https://issues.apache.org/jira/browse/HIVE-29724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18103897#comment-18103897
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Naveen Gangam commented on HIVE-29724:
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[~zabetak] A background cleanup thread makes sense like the noticication
cleaner but there is risk in carrying out metadata operations in line like a
background thread because there would be requests attempting to read in
parallel unlike the notification logger. This would not be like a typical JDO
operation where we delete HMS objects. This needs to execute a specific SQL to
carry this out. Typically, such operations are done out of band via the
metatool that is used to metadata operations specifically.
Do we see the need to perform this periodically ?
> Provide a Metastore tool for de-duplicating the columns
> -------------------------------------------------------
>
> Key: HIVE-29724
> URL: https://issues.apache.org/jira/browse/HIVE-29724
> Project: Hive
> Issue Type: Improvement
> Reporter: Zhihua Deng
> Priority: Major
>
> Following the discussion on HIVE-29694, we can provide a tool to de-duplicate
> the columns to avoid column metadata bloat, which could happen during
> replication.
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