2017-05-08-tidb-weekly.md

layout	title
post	Weekly Update

Weekly update in TiDB

2017-05-08

Last week, we landed 33 PRs in the TiDB repositories.

Added

• Add builtin function is_ipv4_mapped, makedate, utc_time

• Enable privilege checking by default. You could also disable privilege checking through --privilege=false.

• Support Analyze Index statement: after adding an index, we could run this statement to analyze the newly added index.

• Add Trigger_priv column in mysql.user system table.

• Add coveralls in CI.

Fixed

• Fix incompatible issue in found_rows().

• Fix a few panic when infering type for some functions without argument.

• Fix a data race in Join operator.

• Fix parse time_zone -6:00.

• Fix a bug in checking duplicate column.

• Check ignored errors.

• Fix comment warning in executor package.

• Fix a bug about converting string to bit.

• Recognize uuid() as a dynamic function.

• Fix a bug in rand() with seed.

Improved

• Enlarge the stack size to save the runtime.morestack cost.

• Parallelly prewrite primary and secondary lock.

• New planner framework: SortMergeJoin, IndexReader

• Refactor expression evaluation framework: Rewrite compare operator. Implement the new Eval interface for ColumnExpr and ConstExpr. Decide the return type of ColumnExpr and ConstExpr during planning.

Weekly update in TiKV

2017-05-08

Last week, We landed 13 PRs in the TiKV repositories.

Added

• Apply the Raft logs of multiply regions in batches.

• Add hotspot command in pd-ctl: detect and show hotspot regions.

• Add sub-compaction, base-background-compactions and writable-file-max-buffer-size for RocksDB.

• Let manual compaction run concurrently with background compaction.

Fixed

• Create column family orderly.

• Remove CRC32 checksum when initializing snapshot in RaftStore thread.

• Get the correct position in the pending vote queue.

• Remove old operator limiter when adding new PriorityKind operator.

Improved

• Use channel to reduce lock contention when pushing task to thread pool.

• Make scheduler more smooth when starting PD.