TiFlash v6.6.0

Improvements

• Support an independent MVCC bitmap filter that decouples the MVCC filtering operations in the TiFlash data scanning process, which provides the foundation for future optimization of the data scanning process #6296 @JinheLin
• Reduce the memory usage of TiFlash by up to 30% when there is no query #6589 @hongyunyan

Bug fixes

• Fix the issue that querying TiFlash-related system tables might get stuck #6745 @lidezhu
• Fix the issue that semi-joins use excessive memory when calculating Cartesian products #6730 @gengliqi
• Fix the issue that the result of the division operation on the DECIMAL data type is not rounded #6393 @LittleFall

TiFlash v6.1.5

There is no release note for this version.

TiFlash v6.1.4

Bug fixes

• Fix the issue that TiFlash global locks are blocked for a long time occasionally #6418 @SeaRise
• Fix the issue that high throughput writes cause OOM #6407 @JaySon-Huang

TiFlash v6.5.0

For new features, improvements, and bug fixes released in 6.5.0 for TiFlash, see TiDB 6.5.0 release notes.

TiFlash v5.1.5

Bug fixes

• Fix incorrect microsecond when casting string to datetime #3556
• Fix the panic issue that occurs when TLS is enabled #4196
• Fix a bug that TiFlash might crash due to an error in parallel aggregation #5356
• Fix the issue that a query containing JOIN might be hung if an error occurs #4195
• Fix the issue that the function OR returns wrong results #5849
• Fix the bug that invalid storage directory configurations lead to unexpected behaviors #4093
• Fix potential data inconsistency after a lot of INSERT and DELETE operations #4956
• Fix a bug that data not matching any region range remains on a TiFlash node #4414
• Fix the potential query error after adding columns under heavy read workload #3967
• Fix repeated crashes caused by the commit state jump backward errors #2576
• Fix potential errors when querying on a table with many delete operations #4747
• Fix the issue that the date format identifies '' as an invalid separator #4036
• Fix the wrong result that occurs when casting DATETIME to DECIMAL #4151
• Fix the bug that some exceptions are not handled properly #4101
• Fix the issue that Prepare Merge might damage the metadata of the raft store and cause TiFlash to restart #3435
• Fix a bug that an MPP query might fail due to random gRPC keepalive timeout #4662
• Fix the issue that the result of IN is incorrect in multi-value expressions #4016
• Fix a bug that MPP tasks might leak threads forever #4238
• Fix the issue that expired data is recycled slowly #4146
• Fix the overflow that occurs when casting FLOAT to DECIMAL #3998
• Fix the issue that logical operators return wrong results when the argument type is UInt8 #6127
• Fix the potential index out of bounds error if calling json_length with empty string #2705
• Fix wrong decimal comparison results in corner cases #4512
• Fix TiFlash_schema_error reported when NOT NULL columns are added #4596
• Fix the issue that TiFlash bootstrap fails when 0.0 is used as the default value for integers, for example, `i` int(11) NOT NULL DEFAULT '0.0' #3157

TiFlash v6.1.3

Bug fixes

• Fix the issue that logical operators return wrong results when the argument type is UInt8 #6127
• Fix the issue that wrong data input for CAST(value AS DATETIME) causing high TiFlash sys CPU #5097 @xzhangxian1008
• Fix the issue that heavy write pressure might generate too many column files in the delta layer #6361 @lidezhu
• Fix the issue that column files in the delta layer cannot be compacted after restarting TiFlash #6159 @lidezhu

TiFlash v5.3.4

Bug fixes

• Fix the issue that logical operators return wrong results when the argument type is UInt8 #6127
• Fix the issue that TiFlash bootstrap fails when 0.0 is used as the default value for integers, for example, `i` int(11) NOT NULL DEFAULT '0.0' #3157

TiFlash v6.4.0

Improvements

• Refactor the TiFlash MPP error handling logic to further improve the stability of MPP #5095 @windtalker
• Optimize the sorting of the TiFlash computation process, and optimize the key handling for Join and Aggregation #5294 @solotzg
• Optimize the memory usage for decoding and remove redundant transfer columns to improve Join performance #6157 @yibin87

Bug fixes

• Fix the OOM issue due to oversized WAL files that occurs when PageStorage GC does not clear the Page deletion marker properly #6163 @JaySon-Huang

TiFlash v5.4.3

Bug fixes

• Fix the issue that the format function might return a Data truncated error #4891
• Fix the issue that TiFlash might crash due to an error in parallel aggregation #5356
• Fix the panic that occurs after creating the primary index with a column containing the NULL value #5859

TiFlash v6.1.2

Bug fixes

• Fix the issue that I/O Limiter might incorrectly throttle the I/O throughput of query requests after bulk writes, which reduces the query performance #5801 @JinheLin
• Fix the issue that a window function might cause TiFlash to crash when the query is canceled #5814 @SeaRise
• Fix the panic that occurs after creating the primary index with a column containing the NULL value #5859 @JaySon-Huang