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https://issues.apache.org/jira/browse/KUDU-3466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17713374#comment-17713374
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Alexey Serbin commented on KUDU-3466:
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[~c8679...@163.com],
Kudu has had ability to scan data at a snapshot from the very beginning since
it uses MVCC. You could check the following client API:
* C++:
https://kudu.apache.org/cpp-client-api/classkudu_1_1client_1_1KuduScanner.html#a5b36a405daf09399438d5501b25b9f9f
* Java:
https://kudu.apache.org/apidocs/org/apache/kudu/client/AbstractKuduScannerBuilder.html#snapshotTimestampMicros-long-
Would be that enough for your use case?
As for difference between two snapshots, that functionality seems to be present
since backup/restore was implemented, but it's not exposed via client API.
That's used for incremental backup/restore in Kudu. Is it something that might
be useful in your use case? If so, what sort of client API you'd like to have
exposed for that purpose?
Thanks!
> I hope kudu can support snapshot management like iceberg, can create, query,
> expiration snapshots, support query data changes between two snapshots.
> -----------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: KUDU-3466
> URL: https://issues.apache.org/jira/browse/KUDU-3466
> Project: Kudu
> Issue Type: New Feature
> Components: api, cfile
> Reporter: sky
> Priority: Major
>
> I hope kudu can support snapshot management like iceberg, can create, query,
> expiration snapshots, support query data changes between two snapshots. This
> is very necessary, when we write data to kudu in real time, often expect the
> data to be like the past, query the data before a fixed time, or query the
> changes between two snapshots in order to facilitate real-time calculation or
> incremental calculation, in the case of data lake is becoming more and more
> of a trend, Real-time computation/incremental computation and snapshot
> management are very much needed new features of kudu.
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