release-1.0.8.md

title	aliases	summary
TiDB 1.0.8 Release Notes	/docs/dev/releases/release-1.0.8/ /docs/dev/releases/108/	TiDB 1.0.8 is released with updates including fixes for various issues, performance optimizations, and stability improvements. PD and TiKV also have updates related to reducing lock overheat, fixing leader selection issues, and improving starting speed. To upgrade, follow the order of PD -> TiKV -> TiDB.

TiDB 1.0.8 Release Notes

On February 11, 2018, TiDB 1.0.8 is released with the following updates:

TiDB

• Fix issues in the Outer Join result in some scenarios
• Optimize the performance of the InsertIntoIgnore statement
• Fix the issue in the ShardRowID option
• Add limitation (Configurable, the default value is 5000) to the DML statements number within a transaction
• Fix an issue in the Table/Column aliases returned by the Prepare statement
• Fix an issue in updating statistics delta
• Fix a panic error in the Drop Column statement
• Fix an DML issue when running the Add Column After statement
• Improve the stability of the GC process by ignoring the regions with GC errors
• Run GC concurrently to accelerate the GC process
• Provide syntax support for the CREATE INDEX statement

PD

• Reduce the lock overheat of the region heartbeats
• Fix the issue that a hot region scheduler selects the wrong Leader

TiKV

• Use DeleteFilesInRanges to clear stale data and improve the TiKV starting speed
• Using Decimal in Coprocessor sum
• Sync the metadata of the received Snapshot compulsorily to ensure its safety

To upgrade from 1.0.7 to 1.0.8, follow the rolling upgrade order of PD -> TiKV -> TiDB.