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TiDB 3.0.0 Beta.1 Release Notes
Release Date: March 26, 2019
TiDB version: 3.0.0-beta.1
TiDB Ansible version: 3.0.0-beta.1
Overview
On March 26, 2019, TiDB 3.0.0 Beta.1 is released. The corresponding TiDB Ansible version is 3.0.0 Beta.1. Compared with TiDB 3.0.0 Beta, this release has greatly improved the stability, usability, features, the SQL optimizer, statistics, and the execution engine.
TiDB
- SQL Optimizer
- Support calculating the Cartesian product by using
Sort Merge Join
#9032 - Support Skyline Pruning, with some rules to prevent the execution plan from relying too heavily on statistics #9337
- Support Window Functions
- Add a type of statistic that indicates the order correlation between columns and the handle column #9315
- Support calculating the Cartesian product by using
- SQL Execution Engine
- Add built-in functions
- Optimize the Chunk size based on the query context, to reduce the execution time of SQL statements and resources consumption of the cluster #6489
- Privilege management
- Server
- Add the
/debug/zip
HTTP interface to get information of the current TiDB instance #9651 - Support the
show pump status
andshow drainer status
SQL statements to check the Pump or Drainer status #9456 - Support modifying the Pump or Drainer status by using SQL statements #9789
- Support adding HASH fingerprints to SQL text for easy tracking of slow SQL statements #9662
- Add the
log_bin
system variable ("0" by default) to control the enabling state of binlog; only support checking the state currently #9343 - Support managing the sending binlog strategy by using the configuration file #9864
- Support querying the slow log by using the
INFORMATION_SCHEMA.SLOW_QUERY
memory table #9290 - Change the MySQL version displayed in TiDB from 5.7.10 to 5.7.25 #9553
- Unify the log format for easy collection and analysis by tools
- Add the
high_error_rate_feedback_total
monitoring item to record the difference between the actual data volume and the estimated data volume based on statistics #9209 - Add the QPS monitoring item in the database dimension, which can be enabled by using a configuration item #9151
- Add the
- DDL
- Add the
ddl_error_count_limit
global variable (“512” by default) to limit the number of DDL task retries (If this number exceeds the limit, the DDL task is canceled) #9295 - Support ALTER ALGORITHM
INPLACE
/INSTANT
#8811 - Support the
SHOW CREATE VIEW
statement #9309 - Support the
SHOW CREATE USER
statement #9240
- Add the
PD
- Unify the log format for easy collection and analysis by tools
- Simulator
- Make hotspot scheduling configurable #1412
- Add the store address as the dimension monitoring item to replace the previous Store ID #1429
- Optimize the
GetStores
overhead to speed up the Region inspection cycle #1410 - Add an interface to delete the Tombstone Store #1472
TiKV
- Optimize the Coprocessor calculation execution framework and implement the TableScan section, with the Single TableScan performance improved by 5% ~ 30%
- Implement the definition of the
BatchRows
row and theBatchColumn
column #3660 - Implement
VectorLike
to support accessing encoded and decoded data in the same way #4242 - Define the
BatchExecutor
to interface and implement the way of converting requests toBatchExecutor
#4243 - Implement transforming the expression tree into the RPN format #4329
- Implement the
BatchTableScanExecutor
vectorization operator to accelerate calculation #4351
- Implement the definition of the
- Unify the log format for easy collection and analysis by tools
- Support using the Local Reader to read in the Raw Read interface #4222
- Add metrics about configuration information #4206
- Add metrics about key exceeding bound #4255
- Add an option to control panic or return an error when encountering the key exceeding bound error #4254
- Add support for the
INSERT
operation, make prewrite succeed only when keys do not exist, and eliminateBatch Get
#4085 - Use more fair batch strategy in the Batch System #4200
- Support Raw scan in tikv-ctl #3825
Tools
- TiDB Binlog
- Add the Arbiter tool that supports reading binlog from Kafka and replicate the data into MySQL
- Support filtering files that do not need to be replicated
- Support replicating generated columns
- Lightning
- Support disabling TiKV periodic Level-1 compaction, and when the TiKV cluster version is 2.1.4 or later, Level-1 compaction is automatically executed in the import mode #119, #4199
- Add the
table_concurrency
configuration item to limit the number of import engines ("16" by default) and avoid overusing the importer disk space #119 - Support saving the intermediate state SST to the disk, to reduce memory usage #4369
- Optimize the import performance of TiKV-Importer and support separate import of data and indexes for large tables #132
- Support importing CSV files #111
- Data replication comparison tool (sync-diff-inspector)
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