TiFlash v6.1.0

Improvements

• Optimize memory calculation for an aggregate operator so that a more efficient algorithm is used in the merge phase #4451

Bug fixes

• Fix potential data inconsistency after a lot of INSERT and DELETE operations #4956

TiFlash v5.4.1

Improvements

• Support displaying multiple Kubernetes clusters in the Grafana dashboard #4129

Bug Fixes

• Fix the panic issue that occurs when TLS is enabled #4196
• Fix possible metadata corruption caused by Region merge on a lagging Region peer #4437
• Fix the issue that a query containing JOIN might be hung if an error occurs #4195
• Fix a bug that MPP tasks might leak threads forever #4238
• Fix the overflow that occurs when casting FLOAT to DECIMAL #3998
• Fix the issue that expired data is recycled slowly #4146
• Fix a bug that canceled MPP queries might cause tasks to hang forever when the local tunnel is enabled #4229
• Fix the issue of memory leak that occurs when a query is canceled #4098
• Fix the wrong result that occurs when casting DATETIME to DECIMAL #4151
• Fix the potential issue of TiFlash panic when Snapshot is applied simultaneously with multiple DDL operations #4072
• Fix the bug that invalid storage directory configurations lead to unexpected behaviors #4093
• Fix the bug that some exceptions are not handled properly #4101
• Fix the issue that casting INT to DECIMAL might cause overflow #3920
• Fix the issue that the result of IN is incorrect in multi-value expressions #4016
• Fix the issue that the date format identifies '\n' as an invalid separator #4036
• Fix the potential query error after adding columns under heavy read workload #3967
• Fix the panic issue that occurs when the memory limit is enabled #3902
• Fix potential data corruption in DTFiles #4778
• Fix potential errors when querying on a table with many delete operations #4747
• Fix a bug that TiFlash reports many "Keepalive watchdog fired" errors randomly #4192
• Fix a bug that data not matching any region range remains on a TiFlash node #4414
• Fix a bug that empty segments cannot be merged after GC #4511

TiFlash v5.2.4

There is no release note for this version.

TiFlash v6.0.0

Improvements

• Forbid the logical splitting of TiFlash files (by adjusting the default value of profiles.default.dt_enable_logical_split to false. See user document for details) and improve the space usage efficiency of the TiFlash columnar storage so that the space occupation of a table synchronized to TiFlash is similar to the space occupation of the table in TiKV.
• Optimize the cluster management and replica replication mechanism for TiFlash by integrating the previous cluster management module into TiDB, which accelerates replica creation for small tables. #29924

Bug Fixes

• Fix the issue of TiFlash panic when the memory limit is enabled #3902
• Fix the issue that expired data is recycled slowly #4146
• Fix the potential issue of TiFlash panic when Snapshot is applied simultaneously with multiple DDL operations #4072
• Fix the potential query error after adding columns under heavy read workload #3967
• Fix the issue that the SQRT function with a negative argument returns NaN instead of Null #3598
• Fix the issue that casting INI to DECIMAL might cause overflow #3920
• Fix the issue that the result of IN is incorrect in multi-value expressions #4016
• Fix the issue that the date format identifies '\n' as an invalid separator #4036
• Fix the issue that the learner-read process takes too much time under high concurrency scenarios #3555
• Fix the wrong result that occurs when casting DATETIME to DECIMAL #4151
• Fix the issue of memory leak that occurs when a query is canceled #4098
• Fix bug that enabling the elastic thread pool might introduce memory leak #4098
• Fix a bug that canceled MPP queries might cause tasks to hang forever when the local tunnel is enabled #4229
• Fix a bug that the failure of HashJoin build side might cause MPP queries to hang forever #4195
• Fix a bug that MPP tasks might leak threads forever #4238

v6.0.0-alpha: add more case in bench_function_cast.cpp (#4109)

close pingcap/tics#4178

TiFlash v5.3.1

Feature enhancements

• Support pushing down ADDDATE() and DATE_ADD() to TiFlash
• Support pushing down INET6_ATON and INET6_NTOA to TiFlash
• Support pushing down INET_ATON and INET_NTOA to TiFlash
• Increase the max supported depth of expression or plan tree in a DAG request from 100 to 200

Bug fixes

• Fix the issue that the str_to_date() function incorrectly handles leading zeros when parsing microseconds
• Fix the TiFlash crash problem when the memory limit is enabled
• Fix the issue that when an input time is earlier than 1970-01-01 00:00:01 UTC, the behavior of unix_timestamp is inconsistent with that of TiDB or MySQL
• Fix the potential data inconsistency caused by widening the primary key column when the primary key is handle
• Fix the overflow bug and the issue of reporting Can't compare error when comparing data in the DECIMAL data type
• Fix the unexpected error of 3rd arguments of function substringUTF8 must be constants.
• Fix the issue that TiFlash fails to start on platforms without the nsl library
• Fix the overflow bug when casting data to the DECIMAL data type
• Fix the issue that the castStringAsReal behavior is inconsistent in TiFlash and in TiDB/TiKV
• Fix the issue that TiFlash might return the EstablishMPPConnection error after it is restarted
• Fix the issue that obsolete data cannot be reclaimed after setting the number of TiFlash replicas to 0
• Fix the issue that the CastStringAsDecimal behavior is inconsistent in TiFlash and in TiDB/TiKV
• Fix the issue that queries with the where <string> clause return wrong results
• Fix the issue that TiFlash might panic when an MPP query is stopped
• Fix the unexpected error of Unexpected type of column: Nullable(Nothing)

TiFlash v5.1.4

Feature enhancements

• Support pushing down ADDDATE() and DATE_ADD() to TiFlash
• Support pushing down INET6_ATON and INET6_NTOA to TiFlash
• Support pushing down INET_ATON and INET_NTOA to TiFlash
• Increase the max supported depth of expression or plan tree in a DAG request from 100 to 200

Bug fixes

• Fix the issue that the str_to_date() function incorrectly handles leading zeros when parsing microseconds
• Fix the TiFlash crash problem when the memory limit is enabled
• Fix the issue that when an input time is earlier than 1970-01-01 00:00:01 UTC, the behavior of unix_timestamp is inconsistent with that of TiDB or MySQL
• Fix the potential data inconsistency caused by widening the primary key column when the primary key is handle
• Fix the overflow bug and the issue of reporting Can't compare error when comparing data in the DECIMAL data type
• Fix the unexpected error of 3rd arguments of function substringUTF8 must be constants.
• Fix the issue that TiFlash fails to start on platforms without the nsl library
• Fix the overflow bug when casting data to the DECIMAL data type
• Fix the issue that the castStringAsReal behavior is inconsistent in TiFlash and in TiDB/TiKV
• Fix the issue that TiFlash might return the EstablishMPPConnection error after it is restarted
• Fix the issue that obsolete data cannot be reclaimed after setting the number of TiFlash replicas to 0
• Fix the issue that the CastStringAsDecimal behavior is inconsistent in TiFlash and in TiDB/TiKV
• Fix the issue that queries with the where <string> clause return wrong results
• Fix the issue that TiFlash might panic when an MPP query is stopped
• Fix the unexpected error of Unexpected type of column: Nullable(Nothing)

TiFlash v5.4.0

Improvements

• Optimize the communication of local operators
• Increase the non-temporary thread count of gRPC to avoid the frequent creation or destruction of threads

Bug fixes

• Fix the issue that TiFlash might panic when an MPP query is stopped
• Fix the issue that queries with the where <string> clause return wrong results
• Fix the potential issue of data inconsistency that might occur when setting the column type of an integer primary key to a larger range
• Fix the issue that when an input time is earlier than 1970-01-01 00:00:01 UTC, the behavior of unix_timestamp is inconsistent with that of TiDB or MySQL
• Fix the issue that TiFlash might return the EstablishMPPConnection error after it is restarted
• Fix the issue that the CastStringAsDecimal behavior is inconsistent in TiFlash and in TiDB/TiKV
• Fix the issue that the DB::Exception: Encode type of coprocessor response is not CHBlock error is returned in the query result
• Fix the issue that the castStringAsReal behavior is inconsistent in TiFlash and in TiDB/TiKV
• Fix the issue that the returned result of the date_add_string_xxx function in TiFlash is inconsistent with that in MySQL

V5.4.0

v5.4.0-alpha

fix inspect won't run in imitative mode (#3807) (#3809)

TiFlash v5.0.6

Bug fixes

• Fix potential data inconsistency after altering a primary key column to a larger int data type
• Fix the issue that TiFlash fails to start up on some platforms, such as ARM, due to the absence of the libnsl.so library
• Fix the issue that the Store size metric does not match the actual data size on a disk
• Fix the issue that TiFlash crashes due to a Cannot open file error
• Fix occasional crashes of TiFlash when an MPP query is killed
• Fix the unexpected error 3rd arguments of function substringUTF8 must be constants
• Fix query failures caused by excessive OR conditions
• Fix the bug that results of where <string> are wrong
• Fix inconsistent behaviors of CastStringAsDecimal between TiFlash and TiDB/TiKV
• Fix query failures caused by the error different types: expected Nullable(Int64), got Int64
• Fix query failures caused by the error Unexpected type of column: Nullable(Nothing)
• Fix query failures caused by overflow when comparing data in the DECIMAL data type