Problemsby GlyphApache Flink connectors and syncs are fragile
2 posts from 2 people2d activeSteady, +1 this weekunverified
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The posts behind it
Flink: Upserts and deletes after a partition spec change leave duplicate and deleted rows in the table
...bug 🐞 After a table's partition spec changes, Flink upsert and CDC writes can silently fail to update or delete rows written before the change: - An upsert of an existing key leaves both the old and the new version in the table, so the primary key is duplicated. - A CDC delete...
Flink: ConvertEqualityDeletes fails with ClassCastException when equality fields contain a DATE column
### Apache Iceberg version 1.12.0 (latest release) ### Query engine Flink ### Please describe the bug 🐞 ### Summary The Flink `ConvertEqualityDeletes` maintenance task (added in 1.12.0) fails on every conversion cycle when the equality field columns include a `DATE` column. No...
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About this problem
Evidence
2 posts from 2 people in 1 place, about 1 a week over 12 days. Mostly on apache/iceberg. Tools named alongside: Apache Iceberg, GitHub.
Frustration Frustration 0 of 3· Seen on GitHub issues
How it was grouped
Posts that state a pain and match the "ingestion" rule about Apache Flink. First post Oct 22, 2026, latest Nov 2, 2026. Unverified: fewer than 3 posts, or one person or place only. Method
The same problem elsewhere
Ingestion connectors and CDC are fragile
7 posts from 7 people on GitHub issues, Reddit.
PostgreSQL connectors and syncs are fragile
4 posts from 4 people on GitHub issues, Hacker News.
MySQL connectors and syncs are fragile
4 posts from 4 people on GitHub issues.
Apache Iceberg connectors and syncs are fragile
3 posts from 3 people on GitHub issues.
SQL Server connectors and syncs are fragile
2 posts from 2 people on GitHub issues. Unverified.
Other Apache Flink problems
Apache Flink users keep filing bugs
Top post: "Clarify that write.*.isolation-level properties do not apply to append/INSERT", one of 5 posts from 5 people on GitHub issues, Reddit, Stack Overflow.
Trouble with Apache Flink column
Top post: "A dropped field is rejected as Cannot drop clustering column when a clustering column under another parent", one of 3 posts from 3 people on GitHub issues.
Apache Flink upgrades break working setups
3 posts from 3 people on GitHub issues.
Apache Flink tables suffer from small files and skew
2 posts from 2 people on GitHub issues. Unverified.
Trouble with Apache Flink columns
Top post: "`VACUUM ... USING INVENTORY` rejects tables with non-nullable columns and comments", one of 2 posts from 2 people on GitHub issues. Unverified.
Apache Flink schema changes break downstream pipelines
2 posts from 2 people on GitHub issues. Unverified.
Trouble with Apache Flink spark
One post on GitHub issues: "DeltaSqlParser does not override parsePlanWithParameters, so SQL parameter markers are dropped". Unverified.
History