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TiDB 3.1 RC Release Notes
Release date: April 2, 2020
TiDB version: 3.1.0-rc
TiDB Ansible version: 3.1.0-rc
Warning
Some known issues are found in this version, and these issues are fixed in new versions. It is recommended that you use the latest 3.1.x version.
New Features
TiDB
- Use the binary search to re-implement partition pruning for better performance #15678
- Support using the
RECOVER
syntax to recover the truncated table #15460 - Add the
AUTO_RANDOM
ID cache for retrying statements and recovering tables #15393 - Support restoring the state of the
AUTO_RANDOM
ID allocator using therecover table
statement #15393 - Support
YEAR
,MONTH
, andTO_DAY
functions as the partitioning keys of the Hash partitioned table #15619 - Add the table ID to the schema-change related tables only when keys need to be locked in the
SELECT... FOR UPDATE
statement #15708 - Add the feature of automatically reading data from different roles according to the load balancing policy and add the
leader-and-follower
system variable to enable this feature #15721 - Support dynamically updating the TLS certificate every time TiDB establishes a new connection to update expired client certificate without restarting the RPC client side #15163
- Upgrade PD Client to support loading the latest certificate every time TiDB establishes a new connection #15425
- Forcibly use the HTTPS protocol with the configured TLS certificates between a TiDB server and a PD server, or between two TiDB servers when
cluster-ssl-*
is configured #15430 - Add the MySQL-compatible
--require-secure-transport
startup option to force the client to enable TLS authentication during the configuration #15442 - Add the
cluster-verify-cn
configuration item. After configuration, the status service can only be used when with the corresponding CN certificate #15137
TiKV
PD
Tools
TiDB Binlog
TiDB Lightning
Backup & Restore (BR)
- Optimize the log output #189
TiDB Ansible
Bug Fixes
TiDB
- Fix the information schema error caused by frequently updating the TiFlash replica #14884
- Fix the issue that
last_insert_id
is incorrectly generated when applyingAUTO_RANDOM
#15149 - Fix the issue that updating the status of TiFlash replica might cause the DDL operation to get stuck #15161
- Forbid
Aggregation
pushdown andTopN
pushdown when there are predicates that can not be pushed down #15141 - Forbid the nested
view
creation #15440 - Fix the error occurred when executing
SELECT CURRENT_ROLE()
afterSET ROLE ALL
#15570 - Fix the failure to identify the
view
name when executing theselect view_name.col_name from view_name
statement #15573 - Fix the issue that an error might occur when pre-processing DDL statements during the write of binlog information #15444
- Fix the panic occurred when accessing both
view
s and partitioned tables #15560 - Fix the error occurred when executing the
VALUES
function with theupdate duplicate key
statement that contains thebit(n)
data type #15487 - Fix the issue that the specified maximum execution time fails to take effect in some scenarios #15616
- Fix the issue that whether the current
ReadEngine
contains TiKV server is not checked when generating the execution plan usingIndex Scan
#15773
TiKV
- Fix the issue of conflict check failure or data index inconsistency caused by inserting an existing key into a transaction and then deleting it immediately when disabling the consistency check parameter #7112
- Fix the calculation error when
TopN
compares unsigned integers #7199 - Introduce a flow control mechanism in Raftstore to solve the problem that without flow control, it might cause slow log tracking and cause the cluster to be stuck; and the problem that the large transaction size might cause the frequent reconnection among TiKV servers #7087 #7078
- Fix the issue that pending read requests sent to replicas might be permanently blocked #6543
- Fix the issue that replica read might be blocked by applying snapshots #7249
- Fix the issue that transferring leader might cause TiKV to panic #7240
- Fix the issue that all SST files are filled with zeroes when backing up data to S3 #6967
- Fix the issue that the size of SST file is not recorded during backup, resulting in many empty Regions after restoration #6983
- Support AWS IAM web identity for backup #7297
PD
- Fix the issue of incorrect Region information caused by data race when PD processes Region heartbeats #2234
- Fix the issue that
random-merge-scheduler
fails to follow location labels and Placement Rules #2212 - Fix the issue that a placement rule is overwritten by another placement rule with the same
startKey
andendKey
#2222 - Fix the issue that the version number of API is inconsistent with that of PD server #2192
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