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releases, readme: add the release notes for 2.1 RC1
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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: TiDB 2.1 RC1 Release Notes | ||
| category: Releases | ||
| --- | ||
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| # TiDB 2.1 RC1 Release Notes | ||
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| On August 24, 2018, TiDB 2.1 RC1 is released! Compared with TiDB 2.1 Beta, this release has great improvement in stability, SQL optimizer, statistics information, and execution engine. | ||
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| ## TiDB | ||
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| - SQL Optimizer | ||
| - Fix the issue that a wrong result is returned after the correlated subquery is decorrelated in some cases [#6972](https://github.com/pingcap/tidb/pull/6972) | ||
| - Optimize the output result of `Explain` [#7011](https://github.com/pingcap/tidb/pull/7011)[#7041](https://github.com/pingcap/tidb/pull/7041) | ||
| - Optimize the choosing strategy of the outer table for `IndexJoin` [#7019](https://github.com/pingcap/tidb/pull/7019) | ||
| - Remove the Plan Cache of the non-`PREPARE` statement [#7040](https://github.com/pingcap/tidb/pull/7040) | ||
| - Fix the issue that the `INSERT` statement is not parsed and executed correctly in some cases [#7068](https://github.com/pingcap/tidb/pull/7068) | ||
| - Fix the issue that the `IndexJoin` result is not correct in some cases [#7150](https://github.com/pingcap/tidb/pull/7150) | ||
| - Fix the issue that the `NULL` value cannot be found using the unique index in some cases [#7163](https://github.com/pingcap/tidb/pull/7163) | ||
| - Fix the range computing issue of the prefix index in UTF-8 [#7194](https://github.com/pingcap/tidb/pull/7194) | ||
| - Fix the issue that result is not correct caused by eliminating the `Project` operator in some cases [#7257](https://github.com/pingcap/tidb/pull/7257) | ||
| - Fix the issue that `USE INDEX(`PRIMARY`)` cannot be used when the primary key is an integer [#7316](https://github.com/pingcap/tidb/pull/7316) | ||
| - Fix the issue that the index range cannot be computed using the correlated column in some cases [#7357](https://github.com/pingcap/tidb/pull/7357) | ||
| - SQL Execution Engine | ||
| - Fix the issue that the daylight saving time is not computed correctly in some cases [#6823](https://github.com/pingcap/tidb/pull/6823) | ||
| - Refactor the aggregation function framework to improve the execution efficiency of the `Stream` and `Hash` aggregation operators [#6852](https://github.com/pingcap/tidb/pull/6852) | ||
| - Fix the issue that the `Hash` aggregation operator cannot exit normally in some cases [#6982](https://github.com/pingcap/tidb/pull/6982) | ||
| - Fix the issue that `BIT_AND`/`BIT_OR`/`BIT_XOR` does not handle the non-integer data correctly [#6994](https://github.com/pingcap/tidb/pull/6994) | ||
| - Optimize the execution speed of the `REPLACE INTO` statement and increase the performance nearly 10 times [#7027](https://github.com/pingcap/tidb/pull/7027) | ||
| - Optimize the memory usage of time type data and decrease the memory usage of the time type data by fifty percent [#7043](https://github.com/pingcap/tidb/pull/7043) | ||
| - Fix the issue that the returned result is mixed with signed and unsigned integers in the `UNION` statement is not compatible with MySQL [#7112](https://github.com/pingcap/tidb/pull/7112) | ||
| - Fix the panic issue caused by the too much memory applied by `LPAD`/`RPAD`/`TO_BASE64`/`FROM_BASE64`/`REPEAT` [#7171](https://github.com/pingcap/tidb/pull/7171) [#7266](https://github.com/pingcap/tidb/pull/7266) [#7409](https://github.com/pingcap/tidb/pull/7409) [#7431](https://github.com/pingcap/tidb/pull/7431) | ||
| - Fix the incorrect result when `MergeJoin`/`IndexJoin` handles the `NULL` value [#7255](https://github.com/pingcap/tidb/pull/7255) | ||
| - Fix the incorrect result of `Outer Join` in some cases [#7288](https://github.com/pingcap/tidb/pull/7288) | ||
| - Improve the error message of `Data Truncated` to facilitate locating the wrong data and the corresponding field in the table [#7401](https://github.com/pingcap/tidb/pull/7401) | ||
| - Fix the incorrect result for `decimal` in some cases [#7001](https://github.com/pingcap/tidb/pull/7001) [#7113](https://github.com/pingcap/tidb/pull/7113) [#7202](https://github.com/pingcap/tidb/pull/7202) [#7208](https://github.com/pingcap/tidb/pull/7208) | ||
| - Optimize the point select performance [#6937](https://github.com/pingcap/tidb/pull/6937) | ||
| - Prohibit the isolation level of `Read Commited` to avoid the underlying problem [#7211](https://github.com/pingcap/tidb/pull/7211) | ||
| - Fix the incorrect result of `LTRIM`/`RTRIM`/`TRIM` in some cases [#7291](https://github.com/pingcap/tidb/pull/7291) | ||
| - Fix the issue that the `MaxOneRow` operator cannot guarantee that the returned result does not exceed one row [#7375](https://github.com/pingcap/tidb/pull/7375) | ||
| - Divide the Coprocessor requests with too many ranges [#7454](https://github.com/pingcap/tidb/pull/7454) | ||
| - Statistics | ||
| - Optimize the mechanism of statistics dynamic collection [#6796](https://github.com/pingcap/tidb/pull/6796) | ||
| - Fix the issue that `Auto Analyze` does not work when data is updated frequently [#7022](https://github.com/pingcap/tidb/pull/7022) | ||
| - Decrease the Write conflicts during the statistics dynamic update process [#7124](https://github.com/pingcap/tidb/pull/7124) | ||
| - Optimize the cost estimation when the statistics is incorrect [#7175](https://github.com/pingcap/tidb/pull/7175) | ||
| - Optimize the `AccessPath` cost estimation strategy [#7233](https://github.com/pingcap/tidb/pull/7233) | ||
| - Server | ||
| - Fix the bug in loading privilege information [#6976](https://github.com/pingcap/tidb/pull/6976) | ||
| - Fix the issue that the `Kill` command is too strict with privilege check [#6954](https://github.com/pingcap/tidb/pull/6954) | ||
| - Fix the issue of removing some binary numeric types [#6922](https://github.com/pingcap/tidb/pull/6922) | ||
| - Shorten the output log [#7029](https://github.com/pingcap/tidb/pull/7029) | ||
| - Handle the `mismatchClusterID` issue [#7053](https://github.com/pingcap/tidb/pull/7053) | ||
| - Add the `advertise-address` configuration item [#7078](https://github.com/pingcap/tidb/pull/7078) | ||
| - Add the `GrpcKeepAlive` option [#7100](https://github.com/pingcap/tidb/pull/7100) | ||
| - Add the connection or `Token` time monitor [#7110](https://github.com/pingcap/tidb/pull/7110) | ||
| - Optimize the data decoding performance [#7149](https://github.com/pingcap/tidb/pull/7149) | ||
| - Add the `PROCESSLIST` table in `INFORMMATION_SCHEMA` [#7236](https://github.com/pingcap/tidb/pull/7236) | ||
| - Fix the order issue when multiple rules are hit in verifying the privilege [#7211](https://github.com/pingcap/tidb/pull/7211) | ||
| - Change some default values of encoding related system variables to UTF-8 [#7198](https://github.com/pingcap/tidb/pull/7198) | ||
| - Make the slow query log show more detailed information [#7302](https://github.com/pingcap/tidb/pull/7302) | ||
| - Support registering tidb-server related information in PD and obtaining this information by HTTP API [#7082](https://github.com/pingcap/tidb/pull/7082) | ||
| - Compatibility | ||
| - Support Session variables `warning_count` and `error_count` [#6945](https://github.com/pingcap/tidb/pull/6945) | ||
| - Add `Scope` check when reading the system variables [#6958](https://github.com/pingcap/tidb/pull/6958) | ||
| - Support the `MAX_EXECUTION_TIME` syntax [#7012](https://github.com/pingcap/tidb/pull/7012) | ||
| - Support more statements of the `SET` syntax [#7020](https://github.com/pingcap/tidb/pull/7020) | ||
| - Add validity check when setting system variables [#7117](https://github.com/pingcap/tidb/pull/7117) | ||
| - Add the verification of the number of `PlaceHolder`s in the `Prepare` statement [#7162](https://github.com/pingcap/tidb/pull/7162) | ||
| - Support `set character_set_results = null` [#7353](https://github.com/pingcap/tidb/pull/7353) | ||
| - Support the `flush status` syntax [#7369](https://github.com/pingcap/tidb/pull/7369) | ||
| - Fix the column size of `SET` and `ENUM` types in `information_schema` [#7347](https://github.com/pingcap/tidb/pull/7347) | ||
| - Support the `NATIONAL CHARACTER` syntax of statements for creating a table [#7378](https://github.com/pingcap/tidb/pull/7378) | ||
| - Support the `CHARACTER SET` syntax in the `LOAD DATA` statement [#7391](https://github.com/pingcap/tidb/pull/7391) | ||
| - Fix the column information of the `SET` and `ENUM` types [#7417](https://github.com/pingcap/tidb/pull/7417) | ||
| - Support the `IDENTIFIED WITH` syntax in the `CREATE USER` statement [#7402](https://github.com/pingcap/tidb/pull/7402) | ||
| - Fix the precision losing issue during `TIMESTAMP` computing process [#7418](https://github.com/pingcap/tidb/pull/7418) | ||
| - Support the validity verification of more `SYSTEM` variables [#7196](https://github.com/pingcap/tidb/pull/7196) | ||
| - Fix the incorrect result when the `CHAR_LENGTH` function computes the binary string [#7410](https://github.com/pingcap/tidb/pull/7410) | ||
| - Fix the incorrect `CONCAT` result in a statement involving `GROUP BY` [#7448](https://github.com/pingcap/tidb/pull/7448) | ||
| - Fix the imprecise type length issue when casting the `DECIMAL` type to the `STRING` type [#7451](https://github.com/pingcap/tidb/pull/7451) | ||
| - DML | ||
| - Fix the stability issue of the `Load Data` statement [#6927](https://github.com/pingcap/tidb/pull/6927) | ||
| - Fix the memory usage issue when performing some `Batch` operations [#7086](https://github.com/pingcap/tidb/pull/7086) | ||
| - Improve the performance of the `Replace Into` statement [#7027](https://github.com/pingcap/tidb/pull/7027) | ||
| - Fix the inconsistent precision issue when writing `CURRENT_TIMESTAMP` [#7355](https://github.com/pingcap/tidb/pull/7355) | ||
| - DDL | ||
| - Improve the method of DDL judging whether `Schema` is synchronized to avoid misjudgement in some cases [#7319](https://github.com/pingcap/tidb/pull/7319) | ||
| - Fix the `SHOW CREATE TABLE` result in adding index process [#6993](https://github.com/pingcap/tidb/pull/6993) | ||
| - Allow the default value of `text`/`blob`/`json` to be NULL in non-restrict `sql-mode` [#7230](https://github.com/pingcap/tidb/pull/7230) | ||
| - Fix the `ADD INDEX` issue in some cases [#7142](https://github.com/pingcap/tidb/pull/7142) | ||
| - Increase the speed of adding `UNIQUE-KEY` index operation largely [#7132](https://github.com/pingcap/tidb/pull/7132) | ||
| - Fix the truncating issue of the prefix index in UTF-8 character set [#7109](https://github.com/pingcap/tidb/pull/7109) | ||
| - Add the environment variable `tidb_ddl_reorg_priority` to control the priority of the `add-index` operation [#7116](https://github.com/pingcap/tidb/pull/7116) | ||
| - Fix the display issue of `AUTO-INCREMENT` in `information_schema.tables` [#7037](https://github.com/pingcap/tidb/pull/7037) | ||
| - Support the `admin show ddl jobs <number>` command and support output specified number of DDL jobs [#7028](https://github.com/pingcap/tidb/pull/7028) | ||
| - Support parallel DDL job execution [#6955](https://github.com/pingcap/tidb/pull/6955) | ||
| - [Table Partition](https://github.com/pingcap/tidb/projects/6) (Experimental) | ||
| - Support top level partition | ||
| - Support `Range Partition` | ||
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| ## PD | ||
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| - Features | ||
| - Introduce the version control mechanism and support rolling update of the cluster with compatibility | ||
| - Enable the `region merge` feature | ||
| - Support the `GetPrevRegion` interface | ||
| - Support splitting Regions in batch | ||
| - Support storing the GC safepoint | ||
| - Improvements | ||
| - Optimize the issue that TSO allocation is affected by the system clock going backwards | ||
| - Optimize the performance of handling Region heartbeats | ||
| - Optimize the Region tree performance | ||
| - Optimize the performance of computing hotspot statistics | ||
| - Optimize returning the error code of API interface | ||
| - Add options of controlling scheduling strategies | ||
| - Prohibit using special characters in `label` | ||
| - Improve the scheduling simulator | ||
| - Support splitting Regions using statistics in pd-ctl | ||
| - Support formatting JSON output by calling `jq` in pd-ctl | ||
| - Add metrics about etcd Raft state machine | ||
| - Bug fixes | ||
| - Fix the issue that the namespace is not reloaded after switching Leader | ||
| - Fix the issue that namespace scheduling exceeds the schedule limit | ||
| - Fix the issue that hotspot scheduling exceeds the schedule limit | ||
| - Fix the issue that wrong logs are output when the PD client closes | ||
| - Fix the wrong statistics of Region heartbeat latency | ||
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| ## TiKV | ||
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| - Features | ||
| - Support `batch split` to avoid too large Regions caused by the Write operation on hot Regions | ||
| - Support splitting Regions based on the number of rows to improve the index scan efficiency | ||
| - Performance | ||
| - Use `LocalReader` to separate the Read operation from the raftstore thread to lower the Read latency | ||
| - Refactor the MVCC framework, optimize the memory usage and improve the scan Read performance | ||
| - Support splitting Regions based on statistics estimation to reduce the I/O usage | ||
| - Optimize the issue that the Read performance is affected by continuous Write operations on the rollback record | ||
| - Reduce the memory usage of pushdown aggregation computing | ||
| - Improvements | ||
| - Add the pushdown support for a large number of built-in functions and better charset support | ||
| - Optimize the GC workflow, improve the GC speed and decrease the impact of GC on the system | ||
| - Enable `prevote` to speed up service recovery when the network is abnormal | ||
| - Add the related configuration items of RocksDB log files | ||
| - Adjust the default configuration of `scheduler_latch` | ||
| - Support setting whether to compact the data in the bottom layer of RocksDB when using tikv-ctl to compact data manually | ||
| - Add the check for environment variables when starting TiKV | ||
| - Support dynamically configuring the `dynamic_level_bytes` parameter based on the existing data | ||
| - Support customizing the log format | ||
| - Integrate tikv-fail in tikv-ctl | ||
| - Add I/O metrics of threads | ||
| - Bug fixes | ||
| - Fix decimal related issues | ||
| - Fix the issue that `gRPC max_send_message_len` is set mistakenly | ||
| - Fix the issue caused by misconfiguration of `region_size` |
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