TonsnakeLin

PessmistincLock: lock the key if exists

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Signed-off-by: TonsnakeLin ### What is changed and how it works? Issue Number: Close #13210 What's Changed: We add a new process for pessimistic lock request that TiKV lock the key...

## Bug Report ### What version of TiKV are you using? master, V6.2 and earlier ### What operating system and CPU are you using? ### Steps to reproduce https://github.com/tikv/tikv/blob/master/src/storage/mod.rs#L1430 the...

## Development Task TiKV locks the key whether it exists or not for pessimistic lock request, but sometimes we need TiKV lock the key only if it exists. We add...

batchsystem: Refactor Poller::poll function

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### What is changed and how it works? Issue Number: Close #12981 What's Changed: Abstract a closure to remove duplicated lines. ```commit-message ``` ### Related changes - PR to update...

**1. current process** Currently, TiKV locks the specified keys for pessimistic lock requests whether it exists or not. TiDB sends a get request to judge whether the keys exists on...

update optimistic-transaction.md

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### What issue does this PR solve? - close #114 ### What is changed: Added dev guide article for optimistic transaction

testcase: add a testcase for second fetch of selectResponse

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Signed-off-by: TonsnakeLin ### What problem does this PR solve? Issue Number: close #37226 Problem Summary: ### What is changed and how it works? Adding a test case which tunes the...

TiDB writes SnapshotRuntimeStats to slow log, but we found that the `TimeDetail` and 'ScanDetail' is lost. It is because that Cloning SnapshotRuntimeStats omits some information.

Integer Shard Index

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Signed-off-by: TonsnakeLin Hot index reduces the write scalability of the TiDB cluster when the written data is monotonically increasing. We find out a proposal to solve the problem that is...

Txn_types: Print correct information for insert mutation

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Insert mutation will display `Insert` other than `Put` ### What is changed and how it works? Issue Number: Close #14334 What's Changed: ```commit-message ``` ### Related changes - PR to...