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https://issues.apache.org/jira/browse/HUDI-5095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Forward Xu updated HUDI-5095:
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Attachment: (was: hudi_watermark.png)
> Flink: Stores a special watermark(flag) to identify the current progress of
> writing data
> ----------------------------------------------------------------------------------------
>
> Key: HUDI-5095
> URL: https://issues.apache.org/jira/browse/HUDI-5095
> Project: Apache Hudi
> Issue Type: New Feature
> Components: flink, flink-sql
> Reporter: Forward Xu
> Assignee: Forward Xu
> Priority: Major
> Attachments: image-2022-10-26-16-34-52-245.png
>
>
> In some cases where we need a flag to measure the progress of data writing, I
> think it is a reasonable way to store the watermark as an attribute of the
> hudi commit metadata.
> One of our scenarios is that Flink writes data to Hudi table in real time,
> and then we use this Hudi table to support batch computation, so we need a
> flag to evaluate whether its partition data is complete.
> For example, job1 is scheduled every hour. At 2022-01-19 02:01:00, job1
> starts to check whether the partition (20220119/01) of hudi_table1 is
> completed (Flink writes data to hudi_table1 in real time). When the watermark
> properties of hudi_table1‘s commit metadata are higher than 2022- 01-19
> 02:05:00 Update (5 minutes out of order), we consider partition(20220119/01)
> as completed and we can safely execute Hive or Flink sql for batch
> computation. (basically insert table2 select xx from hudi_table1...)
>
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