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  • Date iconMon, Nov 25, 2019

TiDB Weekly

News & blog posts

In recent years, building a large-scale distributed storage system has become a hot topic. Distributed consensus algorithms like Paxos and Raft are the focus of many technical articles. Last week, we published a post to share some of our firsthand experience in designing a large-scale distributed storage system based on the Raft consensus algorithm.

The full article is here:

Building a Large-scale Distributed Storage System Based on Raft

Community

New contributors

tidb:

  • AerysNan
  • Lanearth
  • YourLovely
  • zouhuan1215
  • SilvaXiang
  • catror
  • someblue
  • koushiro
  • Baytwt
  • silver–bullet

tikv:

  • MaiCw4J
  • AerysNan
  • TommyCpp
  • Renkai
  • wangwangwar

pd:

  • qinggniq
  • hrbeuyz24

docs-cn:

  • baiyuqing

Call for participation

  • Vectorized Expression Working Group

    • Date or Time built-in functions (30⁄65)
    • Decimal built-in functions (20⁄31)
    • Int built-in functions (155⁄187)
    • JSON built-in functions (22⁄27)
    • Real built-in functions (46⁄49)
    • String built-in functions (89⁄133)
    • Duration built-in functions (17⁄45)
    • Last week, 43 PRs were landed in the expression component.
  • Coprocessor SIG:

    • Improve the performance of Chunk Encoder
    • Implement more UDFs
    • Implement the new row format
    • 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 145 PRs in the TiDB repository, 4 PRs in the TiSpark repository, and 76 PRs in the TiKV and PD repositories.

Critical PRs

TiDB:

  • Enable the push-down of 19 functions
  • Do not set the statement priority when tidb_force_priority is set
  • Allocate continuous RowID for the single INSERT statement
  • Support the SQL bindings management
  • Make the error message more readable when dropping the primary key
  • Fix the bug that the cached store cannot be updated when the store address is changed and the original address is made offline
  • Implement the non-block read when Coprocessor meets the lock of a large transaction

TiSpark:

  • Fix TiKV DAGRequest’s outputOffsets

TiKV and PD:

  • Update the blob file format for the ZSTD dictionary compression
  • Replace crc by crc32fast and crc64fast
  • Reduce the size of tikv::storage::errors::Error
  • Update RocksDB and Titan
  • Return commit_ts in the commit response
  • Fix the maximum receivable message size for the client
  • Delay the Replica read when applying a snapshot
  • Add more engine abstraction that works towards Peekable and Iterable for the snapshot
  • Add the rollback reason for check_txn_status
  • Encapsulate IOLimiter and remove the RocksDB dependency from sst_importer

Upcoming TiDB events

Apache Pulsar Meetup x PingCAP Infra Meetup

Date: November 30th, 2019

Location: PingCAP office in Beijing

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