qupeng

## Bug Report ### What version of TiKV are you using? v6.5.x, v7.1.x and v7.5.x. ### What operating system and CPU are you using? It doesn't matter. ### Steps to...

## Bug Report ### What version of TiKV are you using? `v6.5.5`. However, I guess the issue also exists in all later versions. ### What operating system and CPU are...

sink(cdc): avoid temporary memory allocations for avro

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### What problem does this PR solve? Issue Number: close #11590 ### What is changed and how it works? It is like #11595 but removes temporary memory allocations from avro...

sink: avoid memory allocations for transforming ColumnData to Column

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### What problem does this PR solve? Issue Number: ref #11590 ### What is changed and how it works? Avoid to alloc temp objects for ColumnData. ### Check List ####...

CDC should handles unreenterable DDLs correctly

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### Is your feature request related to a problem? ### Seems all `ALTER TABLE`s are unreenterable: ``` [2023/03/24 12:22:38.220 +08:00] [WARN] [mysql_ddl_sink.go:126] ["Execute DDL with error, retry later"] [startTs=440288719245410374] [ddl="ALTER...

TiCDC handles DDLs one by one, which could be a bottleneck

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### What did you do? Deploy a TiCDC cluster, and run lots of `TRUNCATE` statements in the upstream TiDB. ### What did you expect to see? _No response_ ### What...