lidezhu

### What problem does this PR solve? ### What is changed and how does it work? ### Check List Tests - Unit test - E2E test - Manual test (add...

TiDB schema diff is wrong

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## Bug Report Please answer these questions before submitting your issue. Thanks! ### 1. Minimal reproduce step (Required) Load ch-benchmark(warehouse=1500) with tiflash replica using BR; ### 2. What did you...

cli(ticdc): fix create changefeed failure when `enable-old-value` is set to true

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### What problem does this PR solve? Issue Number: close #10711 ### What is changed and how it works? Report a warning and ignore the config when `enable-old-value` is set...

[CDC] Create changefeed failed when config the parameter enable-old-value

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### What did you do? From https://asktug.com/t/topic/1022449 Create changefeed tiup ctl:v7.5.1 cdc changefeed create --server=http://1xxxxxx:8324 --sink-uri="kafka://xxxxxx9092/tidb-supexxx?protocol=canal-json&kafka-version=2.4.1 &partition-num=6&max-message-bytes=10485760&compression=lz4&replication-factor=1" --config=/home/tidb/cdctoml/cdc-xxxxxx-kafka.toml --changefeed-id="cdc-xxxx-kafka" --sort-engine="unified" ### What did you expect to see? Changfeed create successfully...

ticdc: fix incompatiable config description

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### First-time contributors' checklist - [ ] I've signed [**Contributor License Agreement**](https://cla-assistant.io/pingcap/docs-cn) that's required for repo owners to accept my contribution. ### What is changed, added or deleted? (Required) ###...

*(ticdc): split old update kv entry after restarting changefeed

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### What problem does this PR solve? Issue Number: close #10918 ### What is changed and how it works? 1. Split all kv entry of update event which commit ts...

sink(ticdc): only enable batch dml for more than one row

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### What problem does this PR solve? Issue Number: close #10972 ### What is changed and how it works? ### Check List #### Tests - Manual test (add detailed scripts...

  Run sysbench oltp_update_non_index with `batch-dml-enable=false` and `batch-dml-enable=true`, when batch-dml-enable is false, it has higher throughput but consumes less cpu for downstream tidb.

TiCDC meet error: Duplicate entry xxx for key xxx

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### What did you do? If the upstream cluster runs a transaction with multiple updates to the pk/uk like the following: ``` begin; update t set pk=4 where pk=3; update...

ticdc: add description for cdc behaviour change

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### First-time contributors' checklist - [ ] I've signed [**Contributor License Agreement**](https://cla-assistant.io/pingcap/docs-cn) that's required for repo owners to accept my contribution. ### What is changed, added or deleted? (Required) ###...