TiDB Monthly Update for January 2021

Releases

We have four releases this month:

• TiDB 5.0 RC Release Notes
• TiDB 4.0.10 Release Notes
• TiDB Operator 1.2.0-alpha.1 Release Notes
• TiDB Operator 1.1.10 Release Notes

Blog posts

Our CEO Max Liu, in Five Principles that Guide TiDB and PingCAP (Part I) and Five Principles that Guide TiDB and PingCAP (Part II), talked about the philosophy behind TiDB's evolution, and, as a product manager, how he figured out where TiDB would be going and how we finally got there.

In GitHub Discussions: Bringing the Open Source Community Closer Together and All in GitHub, Keke Yi explained why the open source community was scattered around the Internet, how GitHub Discussions brought the community closer together, and why the open source community's future tended to be all in GitHub.

How to Simulate I/O Faults at Runtime, written by Keao Yang, introduced how we implemented the IOChaos experiment without using a sidecar.

In Announcing the TiDB Incubator Program, we were excited to introduce the TiDB Incubator Program, a program designed to ensure that new projects in the TiDB ecosystem can obtain resources and help from the community towards their desired maturity level.

Important pull requests

Planner

• Build the global statistics for partitioned tables
• Retry executing SQL statements without TiFlash after TiFlash is down

SQL-Infra

• Fix the issue that the UPDATE statements can see columns that are not public

Kubernetes

• Support customizing the slow log storage
• Support cancelling backup and restore jobs using the signal and update the status with the failed Pod

Migrate

• Fix the issue that the changefeed's output is out of order in TiCDC
• Try to create tables in parallel in TiDB Lightning

TiUP

• Remove v0manifest
• Support the checkpoint

Important issues

Planner

• To reduce the optimizer's CPU usage when handling the very large IN(...) expression

SQL-Infra

• To fix the issue that ALTER TABLE and ADD INDEX report the panic in the recoverable goroutine error
• To fix the issue that it fails to create bindings in the database with the name that contains a dash
• To fix the issue that the Region information in information_schema.tikv_reigon_status is different from that in HTTP API

Execution

• To fix the issue that point_get gets the wrong result under @@tidb_snapshot

Kubernetes

• To fix the issue that recoverFailover might be forgotten to unset
• To deprecate the Pod validating and mutating webhook

Migrate

• To fix the issue of BR out of memory (OOM) when backing up using the version 4.0.9
• To work on the issue that TiDB Data Migration relay's behavior should align with that of MySQL when using GTID

TiUP

• To import the Ansible cluster to TiUP without the user-defined port parameter in group_vars

Call for participations

Planner

• To fix the issue that the current statistics histogram of a multi-column index actually serves as a single column index

SQL-Infra

• To fix the issue that gocritic reports many warnings
• To fix the issue that the Digest text changes the SQL semantics

Execution

• To fix the TiDB panic that occurs when the goroutine stack exceeds the 1000000000-byte limit
• To fix the issue that delete .. where in in a transaction does not take effect

Kubernetes

• To deprecate the Pod validating and mutating webhook
• To fix the MaxBackup's behavior on BackupSchedule

TiUP

• To fix the issue that the Grafana data source is not found when the cluster name contains test-cluster

New contributors

We'd like to welcome the following new contributors to TiDB and thank them for their work!

tidb:

• Lifeistrange
• yzwqf
• LindaSummer
• krzysztofpioro
• qian9qian10
• hidehalo

tikv:

• SSebo
• Hexilee
• skyzh
• trabbart

pd:

• wangrzneu
• Sullivan12138
• wq1019
• ccw1996

dm:

• Kuri-su

chaos-mesh:

• Gallardot
• vincent178
• AngleNet

client-rust:

• weihanglo