alexr17 opened a new pull request, #13264:
URL: https://github.com/apache/hudi/pull/13264
### Change Logs
There is some backwards compatibility issues with reading archived timeline
instants pre 0.8.
1st issue is that Avro was upgraded in 0.12 to a version which does not
allow for default Union to be null. This breaks reading these old instants in
HoodieDataBlock.
2nd issue is that it is possible for archived instants to have same
timestamp for different actions, especially given that older versions used
seconds for instant rather than milliseconds. However the archived timeline
does not assume this and assumes each instant has unique timestamp.
### Impact
Now the archived timeline stores a map of string (instant) -> string
(actiontype) -> map <instant, byte[]>
We also retry failures to getSchemaFromHeader with
`.setValidateDefaults(false)` in case of AvroTypeException
### 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. If not, put "none"._
- _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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