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release-2.0.9.md

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TiDB 2.0.9 Release Notes
/docs/dev/releases/release-2.0.9/
/docs/dev/releases/209/
TiDB 2.0.9 was released on November 19, 2018, with significant improvements in system compatibility and stability. The release includes fixes for various issues, such as empty statistics histogram, panic issue with UNION ALL statement, stack overflow issue, and support for specifying utf8mb4 character set. PD and TiKV also received fixes for issues related to server startup failure and interface limits.

TiDB 2.0.9 Release Notes

On November 19, 2018, TiDB 2.0.9 is released. Compared with TiDB 2.0.8, this release has great improvement in system compatibility and stability.

TiDB

  • Fix the issue caused by the empty statistics histogram #7927
  • Fix the panic issue of the UNION ALL statement in some cases #7942
  • Fix the stack overflow issue caused by wrong DDL Jobs #7959
  • Add the slow log for the Commit operation #7983
  • Fix the panic issue caused by the too large Limit value #8004
  • Support specifying the utf8mb4 character set in the USING clause #8048
  • Make the TRUNCATE built-in function support parameters of unsigned integer type #8069
  • Fix the selectivity estimation issue of the primary key for the statistics module in some cases #8150
  • Add the Session variable to control whether _tidb_rowid is allowed to be written in #8126
  • Fix the panic issue of PhysicalProjection in some cases #8154
  • Fix the unstable results of the Union statement in some cases #8168
  • Fix the issue that NULL is not returned by values in the non-Insert statement #8179
  • Fix the issue that the statistics module cannot clear the outdated data in some cases #8184
  • Make the maximum allowed running time for a transaction a configurable option #8209
  • Fix the wrong comparison algorithm of expression rewriter in some cases #8288
  • Eliminate the extra columns generated by the UNION ORDER BY statement #8307
  • Support the admin show next_row_id statement #8274
  • Fix the escape issue of special characters in the Show Create Table statement #8321
  • Fix the unexpected errors in the UNION statement in some cases #8318
  • Fix the issue that canceling a DDL job causes no rollback of a schema in some cases #8312
  • Change tidb_max_chunk_size to a global variable #8333
  • Add an upper bound to the Scan command of ticlient, to avoid overbound scan #8309 #8310

PD

  • Fix the issue that the PD server gets stuck caused by etcd startup failure #1267
  • Fix the issues related to pd-ctl reading the Region key #1298 #1299 #1308
  • Fix the issue that the regions/check API returns the wrong result #1311
  • Fix the issue that PD cannot restart join after a PD join failure #1279

TiKV

  • Add the end-key limit to the kv_scan interface #3749
  • Abandon the max-tasks-xxx configuration and add max-tasks-per-worker-xxx #3093
  • Fix the CompactFiles issue in RocksDB #3789