ROADMAP.md

title	summary	category
TiDB Roadmap	Learn about the roadmap of TiDB.	Roadmap

TiDB Roadmap

This document defines the roadmap for TiDB development.

TiDB:

• Optimizer
  • Refactor Ranger
  • Optimize the cost model
  • Join Reorder
• Statistics
  • Update statistics dynamically according to the query feedback
  • Analyze table automatically
  • Improve the accuracy of Row Count estimation
• Executor
  • Push down the Projection operator to the Coprocessor
  • Improve the performance of the HashJoin operator
  • Parallel Operators
    • Projection
    • Aggregation
    • Sort
  • Compact Row Format to reduce memory usage
  • File Sort

• View
• Window Function
• Common Table Expression
• Table Partition
• Cluster Index
• Improve DDL
  • Speed up Add Index operation
  • Parallel DDL
• Support utf8_general_ci collation

TiKV:

• Raft
  • Region merge
  • Local read thread
  • Multi-thread raftstore
  • None voter
  • Pre-vote
  • Multi-thread apply pool
  • Split region in batch
  • Raft Engine
• RocksDB
  • DeleteRange
  • BlobDB
• Transaction
  • Optimize transaction conflicts
  • Distributed GC
• Coprocessor
  • Streaming
• Tool
  • Import distributed data
  • Export distributed data
  • Disaster Recovery
• Flow control and degradation

PD:

• Improve namespace
  • Different replication policies for different namespaces and tables
• Decentralize scheduling table Regions
• Scheduler supports prioritization to be more controllable
• Use machine learning to optimize scheduling
• Cluster Simulator

TiSpark:

• Limit/Order push-down
• Access through the DAG interface and deprecate the Select interface
• Index Join and parallel merge join
• Data Federation

SRE & tools:

• Kubernetes based integration for the on-premise version
• Dashboard UI for the on-premise version
• The cluster backup and recovery tool
• The data migration tool (Wormhole V2)
• Security and system diagnosis