UCP: support resolving locks of specific keys

[sticnarf]

Description

Normal resolve lock scans the whole region for locks. With resolve lock lite, we resolve only the specified locks. This can reduce TiKV's load when there are a lot of conflicts.

Task breakdown:

• Add an interface resolve_lock_specified_keys, the protocol is:

message ResolveLockRequest {
    Context context = 1;
    uint64 start_version  = 2;
    // If the txn is rolled back, do not set it.
    uint64 commit_version = 3;
    repeated TxnInfo txn_infos = 4;
    // Only resolve specified keys.
    repeated bytes keys = 5;
}

Set specified keys for ResolveLockRequest.

Difficulty

• Medium

Score

• 300

Mentor(s)

• @sticnarf

Recommended Skills

• Rust
• TiKV Transaction Model

[Renkai]

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[sre-bot]

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