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https://issues.apache.org/jira/browse/KAFKA-3522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16747233#comment-16747233
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ASF GitHub Bot commented on KAFKA-3522:
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mjsax commented on pull request #6175: KAFKA-3522: Add public interfaces for
timestamped stores
URL: https://github.com/apache/kafka/pull/6175
Add public interfaces for KIP-258.
- `RecordConverter` is omitted because it added via #6150
- `Stores` is omitted, because we need to add corresponding store builder
classed first
Additionally, adds some internal "facade" classed to allow accessing
TimestampedStores with non-timestamped interfaces. This is part of the backward
compatibility story of the KIP.
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> Consider adding version information into rocksDB storage format
> ---------------------------------------------------------------
>
> Key: KAFKA-3522
> URL: https://issues.apache.org/jira/browse/KAFKA-3522
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Guozhang Wang
> Assignee: Matthias J. Sax
> Priority: Major
> Labels: architecture
>
> Kafka Streams does not introduce any modifications to the data format in the
> underlying Kafka protocol, but it does use RocksDB for persistent state
> storage, and currently its data format is fixed and hard-coded. We want to
> consider the evolution path in the future we we change the data format, and
> hence having some version info stored along with the storage file / directory
> would be useful.
> And this information could be even out of the storage file; for example, we
> can just use a small "version indicator" file in the rocksdb directory for
> this purposes. Thoughts? [~enothereska] [~jkreps]
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