nzw921rx opened a new pull request, #10604:
URL: https://github.com/apache/seatunnel/pull/10604
#10596
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### Purpose of this pull request
Add a `sample-sharding.enable` option for CDC connectors and
`split.sample-sharding.enable` for JDBC connector,
### Does this PR introduce _any_ user-facing change?
New optional config:
- JDBC: `split.sample-sharding.enable` (Boolean, default `true`)
- CDC (MySQL/Oracle/PG/SQLServer): `sample-sharding.enable` (Boolean,
default `true`)
When set to `false`, the system should fall back to unevenly-sized chunk
splitting (iterative query approach) regardless of the shard count.
### How was this patch tested?
- Unit test in `DynamicChunkSplitterTest`: verifies config parsing and
default value
- E2E test in `JdbcMysqlSplitIT`: verifies that `enable=true` uses sampling
path while `enable=false` falls back to unevenly-sized chunk splitting,
producing different split counts
### Check list
* Documentation updated (en & zh) for JDBC, MySQL-CDC, Oracle-CDC,
PostgreSQL-CDC, SqlServer-CDC
* No incompatible changes (default `true`, fully backward compatible)
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