waitingF opened a new pull request, #10266:
URL: https://github.com/apache/hudi/pull/10266
### Change Logs
Currently, to gain low ingestion latency, we can adopt the MergeOnRead
table, which support appending log files and
compact log files into base file later. When querying the snapshot table (RT
table) generated by MOR,
query side have to perform a compaction so that they can get all data, which
is expected time-consuming causing query latency.
At the time, hudi provide read-optimized table (RO table) for low query
latency just like COW.
But currently, there is no compaction strategy based on event time, so there
is no data freshness guarantee for RO table.
For cases, user want all data before a specified time, user have to query
the RT table to get all data with expected high query latency.
Based on this, we want to implement the strategy based on the event time:
`EventTimeBasedCompactionStrategy`.
### Impact
_Describe any public API or user-facing feature change or any performance
impact._
### Risk level (write none, low medium or high below)
_If medium or high, explain what verification was done to mitigate the
risks._
### Documentation Update
_Describe any necessary documentation update if there is any new feature,
config, or user-facing change_
- _The config description must be updated if new configs are added or the
default value of the configs are changed_
- _Any new feature or user-facing change requires updating the Hudi website.
Please create a Jira ticket, attach the
ticket number here and follow the
[instruction](https://hudi.apache.org/contribute/developer-setup#website) to
make
changes to the website._
### Contributor's checklist
- [ ] Read through [contributor's
guide](https://hudi.apache.org/contribute/how-to-contribute)
- [ ] Change Logs and Impact were stated clearly
- [ ] Adequate tests were added if applicable
- [ ] CI passed
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