TiDB Weekly

Community

New contributor

tidb:

• yuanjize

Call for participation

• Coprocessor SIG:

  • Improve the performance of Chunk Encoder
  • Port BinaryJSON
  • Tracing
  • The maximum execution time of Per-request

• More issues to solve for TiDB

• More issues to solve for TiKV

Updates of the week

Progress

Last week, we landed 36 PRs in the TiDB repository, 14 PRs in the TiSpark repository, and 42 PRs in the TiKV and PD repositories.

Critical PRs

TiDB:

• Support the sql tag in the pprof result
• Add a metric for ttlManager to record the lifetime reach events
• Support renaming columns in DDL operations
• Support the partitioned table for the /mvcc/* HTTP API
• Add the memory tracker for InsertExec and ReplaceExec
• Open the push-down switcher for a part of the CAST functions
• Support caching Coprocessor responses
• Add the fast access path for the hash partition
• Support IndexMergeReaderExecutor

TiSpark:

• Refactor the expression system
• Fix the current breakage against TiKV

TiKV and PD:

• Change the default write buffer size of LockCF to 32MB
• Add the exclusive label
• Fix the panic when enabling placement rules
• Fix the issue that MvccProperties is not generated when TiKV restores data
• Upgrade etcd to v3.4.3
• Support specifying keys to split Regions
• Add resolved_ts
• Use commit to clean up pessimistic locks
• Enable the gRPC keepalive feature on TiKV servers
• Filter the write CF SST by commit ts in the incremental backup
• Check need_gc before getting the snapshot
• Add the feature of changing the online configuration
• Add the pd-backup tool
• Improve the waiter manager
• Add the configuration gRPC service
• Remove jemalloc from the default feature of tikv-alloc
• Adjust the store limit dynamically according to the cluster state