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TiDB 7.1.6 Release Notes

Release date: November 21, 2024

TiDB version: 7.1.6

Quick access: Quick start | Production deployment

Compatibility changes

  • Set a default limit of 2048 for DDL historical tasks retrieved through the TiDB HTTP API to prevent OOM issues caused by excessive historical tasks #55711 @joccau
  • In earlier versions, when processing a transaction containing UPDATE changes, if the primary key or non-null unique index value is modified in an UPDATE event, TiCDC splits this event into DELETE and INSERT events. Starting from v7.1.6, when using the MySQL sink, TiCDC splits an UPDATE event into DELETE and INSERT events if the transaction commitTS for the UPDATE change is less than TiCDC thresholdTS (which is the current timestamp fetched from PD when TiCDC starts replicating the corresponding table to the downstream). This behavior change addresses the issue of downstream data inconsistencies caused by the potentially incorrect order of UPDATE events received by TiCDC, which can lead to an incorrect order of split DELETE and INSERT events. For more information, see documentation. #10918 @lidezhu
  • Must set the line terminator when using TiDB Lightning strict-format to import CSV files #37338 @lance6716

Improvements

  • TiDB

    • Adjust estimation results from 0 to 1 for equality conditions that do not hit TopN when statistics are entirely composed of TopN and the modified row count in the corresponding table statistics is non-zero #47400 @terry1purcell
    • Remove stores without Regions during MPP load balancing #52313 @xzhangxian1008
    • Improve the MySQL compatibility of expression default values displayed in the output of SHOW CREATE TABLE #52939 @CbcWestwolf
    • By batch deleting TiFlash placement rules, improve the processing speed of data GC after performing the TRUNCATE or DROP operation on partitioned tables #54068 @Lloyd-Pottiger
    • Improve sync load performance to reduce latency in loading statistics #52294 hawkingrei

  • TiKV

    • Add slow logs for peer and store messages #16600 @Connor1996
    • Optimize the compaction trigger mechanism of RocksDB to accelerate disk space reclamation when handling a large number of DELETE versions #17269 @AndreMouche
    • Optimize the jittery access delay when restarting TiKV due to waiting for the log to be applied, improving the stability of TiKV #15874 @LykxSassinator
    • Remove unnecessary async blocks to reduce memory usage #16540 @overvenus

  • TiFlash

    • Optimize the execution efficiency of LENGTH() and ASCII() functions #9344 @xzhangxian1008
    • Mitigate the issue that TiFlash might panic due to updating certificates after TLS is enabled #8535 @windtalker
    • Improve the cancel mechanism of the JOIN operator, so that the JOIN operator can respond to cancel requests in a timely manner #9430 @windtalker
    • Reduce lock conflicts under highly concurrent data read operations and optimize short query performance #9125 @JinheLin
    • Improve the garbage collection speed of outdated data in the background for tables with clustered indexes #9529 @JaySon-Huang

  • Tools

    • Backup & Restore (BR)

      • Enhance the tolerance of log backup to merge operations. When encountering a reasonably long merge operation, log backup tasks are less likely to enter the error state #16554 @YuJuncen
      • BR cleans up empty SST files during data recovery #16005 @Leavrth
      • Increase the number of retries for failures caused by DNS errors #53029 @YuJuncen
      • Increase the number of retries for failures caused by the absence of a leader in a Region #54017 @Leavrth
      • Except for the br log restore subcommand, all other br log subcommands support skipping the loading of the TiDB domain data structure to reduce memory consumption #52088 @Leavrth
      • Support checking whether the disk space in TiKV is sufficient before TiKV downloads each SST file. If the space is insufficient, BR terminates the restore and returns an error #17224 @RidRisR
      • Support setting Alibaba Cloud access credentials through environment variables #45551 @RidRisR
      • Reduce unnecessary log printing during backup #55902 @Leavrth

    • TiCDC

      • Support directly outputting raw events when the downstream is a Message Queue (MQ) or cloud storage #11211 @CharlesCheung96
      • Improve memory stability during data recovery using redo logs to reduce the probability of OOM #10900 @CharlesCheung96
      • When the downstream is TiDB with the SUPER permission granted, TiCDC supports querying the execution status of ADD INDEX DDL from the downstream database to avoid data replication failure due to timeout in retrying executing the DDL statement in some cases #10682 @CharlesCheung96

    • TiDB Data Migration (DM)

      • Upgrade go-mysql to 1.9.1 to support connecting to MySQL server 8.0 using passwords longer than 19 characters #11603 @fishiu

Bug fixes

  • TiDB

    • Fix the issue of inconsistent data indexes caused by concurrent DML operations when adding a unique index #52914 @wjhuang2016
    • Fix the issue that comparing a column of YEAR type with an unsigned integer that is out of range causes incorrect results #50235 @qw4990
    • Fix the issue that INDEX_HASH_JOIN cannot exit properly when SQL is abnormally interrupted #54688 @wshwsh12
    • Fix the issue that the network partition during adding indexes using the Distributed eXecution Framework (DXF) might cause inconsistent data indexes #54897 @tangenta
    • Fix the issue that using SHOW WARNINGS; to obtain warnings might cause a panic #48756 @xhebox
    • Fix the issue that querying the INFORMATION_SCHEMA.CLUSTER_SLOW_QUERY table might cause TiDB to panic #54324 @tiancaiamao
    • Fix the issue of abnormally high memory usage caused by memTracker not being detached when the HashJoin or IndexLookUp operator is the driven side sub-node of the Apply operator #54005 @XuHuaiyu
    • Fix the issue that recursive CTE queries might result in invalid pointers #54449 @hawkingrei
    • Fix the issue that an empty projection causes TiDB to panic #49109 @winoros
    • Fix the issue that TiDB might return incorrect query results when you query tables with virtual columns in transactions that involve data modification operations #53951 @qw4990
    • Fix the issue that for tables containing auto-increment columns with AUTO_ID_CACHE=1, setting auto_increment_increment and auto_increment_offset system variables to non-default values might cause incorrect auto-increment ID allocation #52622 @tiancaiamao
    • Fix the issue that subqueries included in the ALL function might cause incorrect results #52755 @hawkingrei
    • Fix the issue that predicates cannot be pushed down properly when the filter condition of a SQL query contains virtual columns and the execution condition contains UnionScan #54870 @qw4990
    • Fix the issue that subqueries in an UPDATE list might cause TiDB to panic #52687 @winoros
    • Fix the issue that indirect placeholder ? references in a GROUP BY statement cannot find columns #53872 @qw4990
    • Fix the issue that disk files might not be deleted after the Sort operator spills and a query error occurs #55061 @wshwsh12
    • Fix the issue of reusing wrong point get plans for SELECT ... FOR UPDATE #54652 @qw4990
    • Fix the issue that max_execute_time settings at multiple levels interfere with each other #50914 @jiyfhust
    • Fix the issue that the histogram and TopN in the primary key column statistics are not loaded after restarting TiDB #37548 @hawkingrei
    • Fix the issue that the TopN operator might be pushed down incorrectly #37986 @qw4990
    • Fix the issue that the performance of the SELECT ... WHERE ... ORDER BY ... statement execution is poor in some cases #54969 @tiancaiamao
    • Fix the issue that TiDB reports an error in the log when closing the connection in some cases #53689 @jackysp
    • Fix the issue that the illegal column type DECIMAL(0,0) can be created in some cases #53779 @tangenta
    • Fix the issue that obtaining the column information using information_schema.columns returns warning 1356 when a subquery is used as a column definition in a view definition #54343 @lance6716
    • Fix the issue that the optimizer incorrectly estimates the number of rows as 1 when accessing a unique index with the query condition column IS NULL #56116 @hawkingrei
    • Fix the issue that SELECT INTO OUTFILE does not work when clustered indexes are used as predicates #42093 @qw4990
    • Fix the issue of incorrect WARNINGS information when using Optimizer Hints #53767 @hawkingrei
    • Fix the issue that the Sync Load QPS monitoring metric is incorrect #53558 @hawkingrei
    • Fix the issue that executing CREATE OR REPLACE VIEW concurrently might result in the table doesn't exist error #53673 @tangenta
    • Fix the issue that restoring a table with AUTO_ID_CACHE=1 using the RESTORE statement might cause a Duplicate entry error #52680 @tiancaiamao
    • Fix the issue that the SUB_PART value in the INFORMATION_SCHEMA.STATISTICS table is NULL #55812 @Defined2014
    • Fix the overflow issue of the Longlong type in predicates #45783 @hawkingrei
    • Fix the issue that incorrect results are returned when the cached execution plans contain the comparison between date types and unix_timestamp #48165 @qw4990
    • Fix the issue that the LENGTH() condition is unexpectedly removed when the collation is utf8_bin or utf8mb4_bin #53730 @elsa0520
    • Fix the issue that when an UPDATE or DELETE statement contains a recursive CTE, the statement might report an error or not take effect #55666 @time-and-fate
    • Fix the issue that TiDB might hang or return incorrect results when executing a query containing a correlated subquery and CTE #55551 @guo-shaoge
    • Fix the issue that statistics for string columns with non-binary collations might fail to load when initializing statistics #55684 @winoros
    • Fix the issue that IndexJoin produces duplicate rows when calculating hash values in the Left Outer Anti Semi type #52902 @yibin87
    • Fix the issue that a query statement that contains UNION might return incorrect results #52985 @XuHuaiyu
    • Fix the issue that empty groupOffset in StreamAggExec might cause TiDB to panic #53867 @xzhangxian1008
    • Fix the issue that RANGE partitioned tables that are not strictly self-incrementing can be created #54829 @Defined2014
    • Fix the issue that the query might get stuck when terminated because the memory usage exceeds the limit set by tidb_mem_quota_query #55042 @yibin87
    • Fix the issue that the STATE field in the INFORMATION_SCHEMA.TIDB_TRX table is empty due to the size of the STATE field not being defined #53026 @cfzjywxk
    • Fix the data race issue in IndexNestedLoopHashJoin #49692 @solotzg
    • Fix the issue that a wrong TableDual plan causes empty query results #50051 @onlyacat
    • Fix the issue that the tot_col_size column in the mysql.stats_histograms table might be a negative number #55126 @qw4990
    • Fix the issue that data conversion from the FLOAT type to the UNSIGNED type returns incorrect results #41736 @guo-shaoge
    • Fix the issue that TiDB fails to reject unauthenticated user connections in some cases when using the auth_socket authentication plugin #54031 @lcwangchao
    • Fix the issue that the memory_quota hint might not work in subqueries #53834 @qw4990
    • Fix the issue that the metadata lock fails to prevent DDL operations from executing in the plan cache scenario #51407 @wjhuang2016
    • Fix the issue that using CURRENT_DATE() as the default value for a column results in incorrect query results #53746 @tangenta
    • Fix the issue that the COALESCE() function returns incorrect result type for DATE type parameters #46475 @xzhangxian1008
    • Reset the parameters in the Open method of PipelinedWindow to fix the unexpected error that occurs when the PipelinedWindow is used as a child node of Apply due to the reuse of previous parameter values caused by repeated opening and closing operations #53600 @XuHuaiyu
    • Fix the incorrect result of the TopN operator in correlated subqueries #52777 @yibin87
    • Fix the issue that the recursive CTE operator incorrectly tracks memory usage #54181 @guo-shaoge
    • Fix the issue that an error occurs when using SHOW COLUMNS to view columns in a view #54964 @lance6716
    • Fix the issue that reducing the value of tidb_ttl_delete_worker_count during TTL job execution makes the job fail to complete #55561 @lcwangchao
    • Fix the issue that using a view does not work in recursive CTE #49721 @hawkingrei
    • Fix the issue that TiDB does not create corresponding statistics metadata (stats_meta) when creating a table with foreign keys #53652 @hawkingrei
    • Fix the issue that the query might return incorrect results instead of an error after being killed #50089 @D3Hunter
    • Fix the issue that the statistics synchronous loading mechanism might fail unexpectedly under high query concurrency #52294 @hawkingrei
    • Fix the issue that certain filter conditions in queries might cause the planner module to report an invalid memory address or nil pointer dereference error #53582 #53580 #53594 #53603 @YangKeao
    • Fix the issue that the TiDB synchronously loading statistics mechanism retries to load empty statistics indefinitely and prints the fail to get stats version for this histogram log #52657 @hawkingrei
    • Fix the issue that the TIMESTAMPADD() function goes into an infinite loop when the first argument is month and the second argument is negative #54908 @xzhangxian1008
    • Fix the issue that TiDB might crash when tidb_mem_quota_analyze is enabled and the memory used by updating statistics exceeds the limit #52601 @hawkingrei
    • Fix the issue that duplicate entry might occur when adding unique indexes #56161 @tangenta
    • Fix the issue that the query latency of stale reads increases, caused by information schema cache misses #53428 @crazycs520
    • Fix the issue that the Distinct_count information in GlobalStats might be incorrect #53752 @hawkingrei
    • Fix the issue that executing the SELECT DISTINCT CAST(col AS DECIMAL), CAST(col AS SIGNED) FROM ... query might return incorrect results #53726 @hawkingrei
    • Fix the issue that the read_from_storage hint might not take effect when the query has an available Index Merge execution plan #56217 @AilinKid
    • Fix the issue that the TIMESTAMPADD() function returns incorrect results #41052 @xzhangxian1008
    • Fix the issue that PREPARE/EXECUTE statements with the CONV expression containing a ? argument might result in incorrect query results when executed multiple times #53505 @qw4990
    • Fix the issue that the memory used by transactions might be tracked multiple times #53984 @ekexium
    • Fix the issue that column pruning without using shallow copies of slices might cause TiDB to panic #52768 @winoros
    • Fix the issue that a SQL binding containing window functions might not take effect in some cases #55981 @winoros
    • Fix the issue that TiDB might panic when parsing index data #47115 @zyguan
    • Fix the issue that TiDB might report an error due to GC when loading statistics at startup #53592 @you06
    • Fix the issue that an error occurs when a DML statement contains nested generated columns #53967 @wjhuang2016
    • Fix the issue that TiDB panics when executing the SHOW ERRORS statement with a predicate that is always true #46962 @elsa0520
    • Fix the issue that improper use of metadata locks might lead to writing anomalous data when using the plan cache under certain circumstances #53634 @zimulala
    • Fix the issue of data index inconsistency caused by retries during index addition #55808 @lance6716
    • Fix the issue that unstable unique IDs of columns might cause the UPDATE statement to return errors #53236 @winoros
    • Fix the issue that after a statement within a transaction is killed by OOM, if TiDB continues to execute the next statement within the same transaction, you might get an error Trying to start aggressive locking while it's already started and a panic occurs #53540 @MyonKeminta
    • Fix the issue that executing RECOVER TABLE BY JOB JOB_ID; might cause TiDB to panic #55113 @crazycs520
    • Fix the issue that executing ADD INDEX might fail after modifying the PD member in the distributed execution framework #48680 @lance6716
    • Fix the issue that two DDL Owners might exist at the same time #54689 @joccau
    • Fix the issue that TiDB rolling restart during the execution of ADD INDEX might cause the adding index operation to fail #52805 @tangenta
    • Fix the issue that the LOAD DATA ... REPLACE INTO operation causes data inconsistency #56408 @fzzf678
    • Fix the issue that the AUTO_INCREMENT field is not correctly set after importing data using the IMPORT INTO statement #56476 @D3Hunter
    • Fix the issue that TiDB does not check for the existence of local files before restoring from a checkpoint #53009 @lance6716
    • Fix the issue that the DM schema tracker cannot create indexes longer than the default length #55138 @lance6716
    • Fix the issue that ALTER TABLE does not handle the AUTO_INCREMENT field correctly #47899 @D3Hunter
    • Fix the issue that unreleased session resources might lead to memory leaks #56271 @lance6716
    • Fix the issue that float or integer overflow affects the plan cache #46538 @hawkingrei
    • Fix the issue that part of the memory of the IndexLookUp operator is not tracked #56440 @wshwsh12
    • Fix the issue that stale read does not strictly verify the timestamp of the read operation, resulting in a small probability of affecting the consistency of the transaction when an offset exists between the TSO and the real physical time #56809 @MyonKeminta
    • Fix the issue that TTL might fail if TiKV is not selected as the storage engine #56402 @YangKeao
    • Fix the issue that TTL tasks cannot be canceled when there is a write conflict #56422 @YangKeao
    • Fix the issue that inserting oversized numbers in scientific notation causes an error ERROR 1264 (22003), to make the behavior consistent with MySQL #47787 @lcwangchao
    • Fix the issue that when canceling a TTL task, the corresponding SQL is not killed forcibly #56511 @lcwangchao
    • Fix the issue that the INSERT ... ON DUPLICATE KEY statement is not compatible with mysql_insert_id #55965 @tiancaiamao
    • Fix the issue that audit log filtering does not take effect when SQL cannot build an execution plan #50988 @CbcWestwolf
    • Fix the issue that existing TTL tasks are executed unexpectedly frequently in a cluster that is upgraded from v6.5 to v7.5 or later #56539 @lcwangchao
    • Fix the issue that the CAST function does not support explicitly setting the character set #55677 @Defined2014
    • Fix the issue that TiDB does not check the index length limitation when executing ADD INDEX #56930 @fzzf678

  • TiKV

    • Add the RawKvMaxTimestampNotSynced error, log detailed error information in errorpb.Error.max_ts_not_synced, and add a retry mechanism for the must_raw_put operation when this error occurs #16789 @pingyu
    • Fix a traffic control issue that might occur after deleting large tables or partitions #17304 @SpadeA-Tang
    • Fix the panic issue that occurs when read threads access outdated indexes in the MemTable of the Raft Engine #17383 @LykxSassinator
    • Fix the issue that CDC and log-backup do not limit the timeout of check_leader using the advance-ts-interval configuration, causing the resolved_ts lag to be too large when TiKV restarts normally in some cases #17107 @SpadeA-Tang
    • Fix the issue that SST files imported by TiDB Lightning are lost after TiKV is restarted #15912 @lance6716
    • Fix the issue that TiKV might panic due to ingesting deleted sst_importer SST files #15053 @lance6716
    • Fix the issue that when there are a large number of Regions in a TiKV instance, TiKV might be OOM during data import #16229 @SpadeA-Tang
    • Fix the issue that bloom filters are incompatible between earlier versions (earlier than v7.1) and later versions #17272 @v01dstar
    • Fix the issue that setting the gRPC message compression method via grpc-compression-type does not take effect on messages sent from TiKV to TiDB #17176 @ekexium
    • Fix the issue of unstable test cases, ensuring that each test uses an independent temporary directory to avoid online configuration changes affecting other test cases #16871 @glorv
    • Fix the issue that when a large number of transactions are queuing for lock release on the same key and the key is frequently updated, excessive pressure on deadlock detection might cause TiKV OOM issues #17394 @MyonKeminta
    • Fix the issue that the decimal part of the DECIMAL type is incorrect in some cases #16913 @gengliqi
    • Fix the issue that the CONV() function in queries might overflow during numeric system conversion, leading to TiKV panic #16969 @gengliqi
    • Fix the issue that TiKV might panic when a stale replica processes Raft snapshots, triggered by a slow split operation and immediate removal of the new replica #17469 @hbisheng
    • Fix the issue that highly concurrent Coprocessor requests might cause TiKV OOM #16653 @overvenus
    • Fix the issue that prevents master key rotation when the master key is stored in a Key Management Service (KMS) #17410 @hhwyt
    • Fix the issue that the output of the raft region command in tikv-ctl does not include the Region status information #17037 @glorv
    • Fix the issue that the Storage async write duration monitoring metric on the TiKV panel in Grafana is inaccurate #17579 @overvenus
    • Fix the issue that TiKV converts the time zone incorrectly for Brazil and Egypt #16220 @overvenus

  • PD

    • Fix the memory leak issue in label statistics #8700 @lhy1024
    • Fix the issue that resource groups print excessive logs #8159 @nolouch
    • Fix the performance jitter issue caused by frequent creation of random number generator #8674 @rleungx
    • Fix the memory leak issue in Region statistics #8710 @rleungx
    • Fix the memory leak issue in hotspot cache #8698 @lhy1024
    • Fix the issue that evict-leader-scheduler fails to work properly when it is repeatedly created with the same Store ID #8756 @okJiang
    • Fix the issue that setting replication.strictly-match-label to true causes TiFlash to fail to start #8480 @rleungx
    • Fix the issue that changing the log level via the configuration file does not take effect #8117 @rleungx
    • Fix the issue that resource groups could not effectively limit resource usage under high concurrency #8435 @nolouch
    • Fix the data race issue that PD encounters during operator checks #8263 @lhy1024
    • Fix the issue that a resource group encounters quota limits when requesting tokens for more than 500 ms #8349 @nolouch
    • Fix the issue that some logs are not redacted #8419 @rleungx
    • Fix the issue that no error is reported when binding a role to a resource group #54417 @JmPotato
    • Fix the issue that PD's Region API cannot be requested when a large number of Regions exist #55872 @rleungx
    • Fix the issue that a large number of retries occur when canceling resource groups queries #8217 @nolouch
    • Fix the issue that the encryption manager is not initialized before use #8384 @rleungx
    • Fix the issue that the Filter target monitoring metric for PD does not provide scatter range information #8125 @HuSharp
    • Fix the data race issue of resource groups #8267 @HuSharp
    • Fix the issue that setting the TiKV configuration item coprocessor.region-split-size to a value less than 1 MiB causes PD panic #8323 @JmPotato
    • Fix the issue that when using a wrong parameter in evict-leader-scheduler, PD does not report errors correctly and some schedulers are unavailable #8619 @rleungx
    • Fix the issue that slots are not fully deleted in a resource group client, which causes the number of the allocated tokens to be less than the specified value #7346 @guo-shaoge
    • Fix the issue that down peers might not recover when using Placement Rules #7808 @rleungx

  • TiFlash

    • Fix the issue that TiFlash metadata might become corrupted and cause the process to panic when upgrading a cluster from a version earlier than v6.5.0 to v6.5.0 or later #9039 @JaySon-Huang
    • Fix the issue that some queries might report a column type mismatch error after late materialization is enabled #9175 @JinheLin
    • Fix the issue that some queries might report errors when late materialization is enabled #9472 @Lloyd-Pottiger
    • Fix the issue that some JSON functions unsupported by TiFlash are pushed down to TiFlash #9444 @windtalker
    • Fix the issue that setting the SSL certificate configuration to an empty string in TiFlash incorrectly enables TLS and causes TiFlash to fail to start #9235 @JaySon-Huang
    • Fix the issue that a network partition (network disconnection) between TiFlash and any PD might cause read request timeout errors #9243 @Lloyd-Pottiger
    • Fix the issue that a large number of duplicate rows might be read in FastScan mode after importing data via BR or TiDB Lightning #9118 @JinheLin
    • Fix the issue that TiFlash fails to parse the table schema when the table contains Bit-type columns with a default value that contains invalid characters #9461 @Lloyd-Pottiger
    • Fix the issue that queries with virtual generated columns might return incorrect results after late materialization is enabled #9188 @JinheLin
    • Fix the issue that TiFlash might fail to synchronize schemas after executing ALTER TABLE ... EXCHANGE PARTITION across databases #7296 @JaySon-Huang
    • Fix the issue that TiFlash might panic when a database is deleted shortly after creation #9266 @JaySon-Huang
    • Fix the issue that when using the CAST() function to convert a string to a datetime with a time zone or invalid characters, the result is incorrect #8754 @solotzg
    • Fix the issue that TiFlash might return transiently incorrect results in high-concurrency read scenarios #8845 @JinheLin
    • Fix the issue that the SUBSTRING_INDEX() function might cause TiFlash to crash in some corner cases #9116 @wshwsh12
    • Fix the issue that frequent EXCHANGE PARTITION and DROP TABLE operations over a long period in a cluster might slow down the replication of TiFlash table metadata and degrade the query performance #9227 @JaySon-Huang
    • Fix the issue that a query with an empty key range fails to correctly generate read tasks on TiFlash, which might block TiFlash queries #9108 @JinheLin
    • Fix the issue that the sign in the result of the CAST AS DECIMAL function is incorrect in certain cases #9301 @guo-shaoge
    • Fix the issue that the SUBSTRING() function does not support the pos and len arguments for certain integer types, causing query errors #9473 @gengliqi
    • Fix the issue that executing DROP TABLE on large tables might cause TiFlash OOM #9437 @JaySon-Huang

  • Tools

    • Backup & Restore (BR)

      • Fix the issue that BR integration test cases are unstable, and add a new test case to simulate snapshot or log backup file corruption #53835 @Leavrth
      • Fix the issue that DDLs requiring backfilling, such as ADD INDEX and MODIFY COLUMN, might not be correctly recovered during incremental restore #54426 @3pointer
      • Fix the issue that after a log backup PITR task fails and you stop it, the safepoints related to that task are not properly cleared in PD #17316 @Leavrth
      • Fix the issue that log backup might be paused after the advancer owner migration #53561 @RidRisR
      • Fix the inefficiency issue in scanning DDL jobs during incremental backups #54139 @3pointer
      • Fix the issue that the backup performance during checkpoint backups is affected due to interruptions in seeking Region leaders #17168 @Leavrth
      • Fix the issue that BR logs might print sensitive credential information when log backup is enabled #55273 @RidRisR
      • Fix the issue that BR fails to correctly identify errors due to multiple nested retries during the restore process #54053 @RidRisR
      • Fix the issue that TiKV might panic when resuming a paused log backup task with unstable network connections to PD #17020 @YuJuncen
      • Fix the issue that backup tasks might get stuck if TiKV becomes unresponsive during the backup process #53480 @Leavrth
      • Fix the issue that the checkpoint path of backup and restore is incompatible with some external storage #55265 @Leavrth
      • Fix the issue that the Region fetched from PD does not have a Leader when restoring data using BR or importing data using TiDB Lightning in physical import mode #51124 #50501 @Leavrth
      • Fix the issue that the transfer of PD leaders might cause BR to panic when restoring data #53724 @Leavrth
      • Fix the issue that after pausing, stopping, and rebuilding the log backup task, the task status is normal, but the checkpoint does not advance #53047 @RidRisR
      • Fix the issue that log backups cannot resolve residual locks promptly, causing the checkpoint to fail to advance #57134 @3pointer

    • TiCDC

      • Fix the issue that the default value of TIMEZONE type is not set according to the correct time zone #10931 @3AceShowHand
      • Fix the issue that TiCDC might panic when the Sorter module reads disk data #10853 @hicqu
      • Fix the issue that data inconsistency might occur when restarting Changefeed repeatedly when performing a large number of UPDATE operations in a multi-node environment #11219 @lidezhu
      • Fix the issue that after filtering out add table partition events is configured in ignore-event, TiCDC does not replicate other types of DML changes for related partitions to the downstream #10524 @CharlesCheung96
      • Fix the issue that TiCDC might get stuck when replicating data to Kafka #9855 @hicqu
      • Fix the issue that DROP PRIMARY KEY and DROP UNIQUE KEY statements are not replicated correctly #10890 @asddongmen
      • Fix the issue that the Processor module might get stuck when the downstream Kafka is inaccessible #11340 @asddongmen

    • TiDB Data Migration (DM)

      • Fix the issue that DM does not set the default database when processing the ALTER DATABASE statement, which causes a replication error #11503 @lance6716
      • Fix the issue that multiple DM-master nodes might simultaneously become leaders, leading to data inconsistency #11602 @GMHDBJD
      • Fix the connection blocking issue by upgrading go-mysql #11041 @D3Hunter
      • Fix the issue that data replication is interrupted when the index length exceeds the default value of max-index-length #11459 @michaelmdeng
      • Fix the issue that DM returns an error when replicating the ALTER TABLE ... DROP PARTITION statement for LIST partitioned tables #54760 @lance6716

    • TiDB Lightning

      • Fix the issue that TiDB Lightning fails to receive oversized messages sent from TiKV #56114 @fishiu
      • Fix the issue that TiKV data might be corrupted when importing data after disabling the import mode of TiDB Lightning #15003 #47694 @lance6716
      • Fix the issue that transaction conflicts occur during data import using TiDB Lightning #49826 @lance6716
      • Fix the issue that TiDB Lightning might fail to import data when EBS BR is running #49517 @mittalrishabh
      • Fix the issue that TiDB Lightning reports a verify allocator base failed error when two instances simultaneously start parallel import tasks and are assigned the same task ID #55384 @ei-sugimoto
      • Fix the issue that killing the PD Leader causes TiDB Lightning to report the invalid store ID 0 error during data import #50501 @Leavrth

    • Dumpling

      • Fix the issue that Dumpling reports an error when exporting tables and views at the same time #53682 @tangenta

    • TiDB Binlog

      • Fix the issue that deleting rows during the execution of ADD COLUMN might report an error data and columnID count not match when TiDB Binlog is enabled #53133 @tangenta

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