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https://issues.apache.org/jira/browse/ARROW-4217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16738761#comment-16738761
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Robert Nishihara commented on ARROW-4217:
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We've started using the metadata to specify the object serialization format
(e.g., Arrow, raw bytes, pickle, ...). We can remove it, but we should have a
good alternative for how to do this. E.g., some discussion in
https://github.com/apache/arrow/pull/2788.
> [Plasma] Remove custom object metadata
> --------------------------------------
>
> Key: ARROW-4217
> URL: https://issues.apache.org/jira/browse/ARROW-4217
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Plasma (C++)
> Affects Versions: 0.11.1
> Reporter: Philipp Moritz
> Assignee: Philipp Moritz
> Priority: Minor
> Fix For: 0.13.0
>
>
> Currently, Plasma supports custom metadata for objects. This doesn't seem to
> be used at the moment, and removing it will simplify the interface and
> implementation of plasma. Removing the custom metadata will also make
> eviction to other blob stores easier (most other stores don't support custom
> metadata).
> My personal use case was to store arrow schemata in there, but they are now
> stored as part of the object itself.
> If nobody else is using this, I'd suggest removing it. If people really want
> metadata, they could always store it as a separate object if desired.
>
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