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TiDB 3.0.6 Release Notes
Release date: November 28, 2019
TiDB version: 3.0.6
TiDB Ansible version: 3.0.6
TiDB
- SQL Optimizer
- Fix the issue that the result is incorrect after the window function AST restores SQL text, for example,
over w
being mistakenly restored toover (w)
#12933 - Fix the issue of pushing down
STREAM AGG()
todoubleRead
#12690 - Fix the issue that quotes are incorrectly handled for SQL binding #13117
- Optimize the
select max(_tidb_rowid) from t
scenario to avoid full table scans #13095 - Fix the issue that the query result is incorrect when the query statement contains a variable assignment expression #13231
- Fix the issue that the result is incorrect when the
UPDATE
statement contains both a sub-query and a generated column; fix theUPDATE
statement execution error when this statement contains two same-named tables from different source databases #13350 - Support
_tidb_rowid
for point queries #13416 - Fix the issue that the generated query execution plan is incorrect, caused by incorrect usage of partitioned table statistics #13628
- Fix the issue that the result is incorrect after the window function AST restores SQL text, for example,
- SQL Execution Engine
- Fix the issue that TiDB is incompatible with MySQL when handling invalid values of the year type #12745
- Reuse
Chunk
in theINSERT ON DUPLICATE UPDATE
statement to reduce the memory overhead #12998 - Add the support for the
JSON_VALID
built-in function #13133 - Support executing
ADMIN CHECK TABLE
on partitioned tables #13140 - Fix the panic issue when
FAST ANALYZE
is executed on empty tables #13343 - Fix the panic issue when executing
FAST ANALYZE
on an empty table that contains multi-column indexes #13394 - Fix the issue that the estimated number of rows is greater than 1 when the
WHERE
clause contains an equal condition on the unique key #13382 - Fix the issue that the returned data might be duplicated when
Streaming
is enabled in TiDB #13254 - Extract the top N values from the count-min sketch to improve the estimation accuracy #13429
- Server
- Make requests sent to TiKV fail quickly when the gRPC dial times out #12926
- Add the following virtual tables: #13009
performance_schema.tidb_profile_allocs
performance_schema.tidb_profile_block
performance_schema.tidb_profile_cpu
performance_schema.tidb_profile_goroutines
- Fix the issue that the
kill
command does not work when the query is waiting for pessimistic locking #12989 - Do not do asynchronous rollback when acquiring pessimistic locking fails and the transaction only involves modifying a single key #12707
- Fix the panic issue when the response for the request of splitting Regions is empty #13092
- Avoid unnecessary backoff when
PessimisticLock
returns a locking error #13116 - Modify the TiDB behavior for checking configurations by printing a warning log for unrecognized configuration option #13272
- Support obtaining the binlog status of all TiDB nodes via the
/info/all
interface #13187 - Fix the issue that goroutine might leak when TiDB kills connections #13251
- Make the
innodb_lock_wait_timeout
parameter work in pessimistic transactions to control the lock wait timeout for pessimistic locking #13165 - Stop updating pessimistic transaction TTL when pessimistic transactional queries are killed to prevent other transactions from waiting unnecessarily #13046
- DDL
- Fix the issue that the execution result of
SHOW CREATE VIEW
in TiDB is inconsistent with that in MySQL #12912 - Support creating
View
based onunion
, for example,create view v as select * from t1 union select * from t2
#12955 - Add more transaction-related fields for the
slow_query
table: #13072Prewrite_time
Commit_time
Get_commit_ts_time
Commit_backoff_time
Backoff_types
Resolve_lock_time
Local_latch_wait_time
Write_key
Write_size
Prewrite_region
Txn_retry
- Use the table’s
COLLATE
instead of the system’s default charset in the column when a table is created and the table containsCOLLATE
#13174 - Limit the length of the index name when creating a table #13310
- Fix the issue that the table name length is not checked when a table is renamed #13346
- Add the
alter-primary-key
configuration (disabled by default) to support adding/dropping the primary key in TiDB #13522
- Fix the issue that the execution result of
TiKV
- Fix the issue that the
acquire_pessimistic_lock
interface returns a wrongtxn_size
#5740 - Limit the writes for GC worker per second to reduce the impact on the performance #5735
- Make
lock_manager
accurate #5845 - Support
innodb_lock_wait_timeout
for pessimistic locking #5848 - Add the configuration check for Titan #5720
- Support using tikv-ctl to dynamically modify the GC I/O limit:
tikv-ctl --host=ip:port modify-tikv-config -m server -n gc.max_write_bytes_per_sec -v 10MB
#5957 - Reduce useless
clean up
requests to decrease the pressure on the deadlock detector #5965 - Avoid reducing TTL in pessimistic locking prewrite requests #6056
- Fix the issue that a missing blob file might occur in Titan #5968
- Fix the issue that
RocksDBOptions
might not take effect in Titan #6009
PD
- Add an
ActOn
dimension for each filter to indicate that each scheduler and checker is affected by the filter, and delete two unused filters:disconnectFilter
andrejectLeaderFilter
#1911 - Print a warning log when it takes more than 5 milliseconds to generate a timestamp in PD #1867
- Lower the client log level when passing unavailable endpoint to the client #1856
- Fix the issue that the gRPC message package might exceed the maximum size in the
region_syncer
replication process #1952
Tools
- TiDB Binlog
- Obtain the initial replication timestamp from PD when
initial-commit-ts
is set to “-1” in Drainer #788 - Decouple Drainer’s
Checkpoint
storage from the downstream and support savingCheckpoint
in MySQL or local files #790 - Fix the Drainer panic issue caused by using empty values when configuring replication database/table filtering #801
- Fix the issue that processes get into the deadlock status instead of exiting after a panic occurs because Drainer fails to apply binlog files to the downstream #807
- Fix the issue that Pump blocks when it exits because of gRPC’s
GracefulStop
#817 - Fix the issue that Drainer fails when it receives a binlog which misses a column during the execution of a
DROP COLUMN
statement in TiDB (v3.0.6 or later) #827
- Obtain the initial replication timestamp from PD when
- TiDB Lightning
- Add the
max-allowed-packet
configuration (64 M by default) for the TiDB backend #248
- Add the
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