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release, TOC: add TiDB 2.1.17 release notes (#1517)
* release, TOC: add TiDB 2.1.17 release notes * dev: remove extra spaces * v2.1: remove extra spaces * v3.0: remove extra spaces * dev: remove a note * v2.1: remove a note * v3.0: remove a note
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| --- | ||
| title: TiDB 2.1.17 Release Notes | ||
| category: Releases | ||
| --- | ||
|
|
||
| # TiDB 2.1.17 Release Notes | ||
|
|
||
| Release date: September 11, 2019 | ||
|
|
||
| TiDB version: 2.1.17 | ||
|
|
||
| TiDB Ansible version: 2.1.17 | ||
|
|
||
| + New features | ||
| - Add the `WHERE` clause in TiDB’s `SHOW TABLE REGIONS` syntax | ||
| - Add the `config-check` feature in TiKV and PD to check the configuration items | ||
| - Add the `remove-tomestone` command in pd-ctl to clear tombstone store records | ||
| - Add the `worker-count` and `txn-batch` configuration items in Reparo to control the recovery speed | ||
|
|
||
| + Improvements | ||
| - Optimize PD’s scheduling process by supporting actively pushing operators | ||
| - Optimize TiKV’s starting process to reduce jitters caused by restarting nodes | ||
|
|
||
| + Changed behaviors | ||
| - Change `start ts` in TiDB slow query logs from the last retry time to the first execution time | ||
| - Replace the `Index_ids` field in TiDB slow query logs with the `Index_names` field to improve the usability of slow query logs | ||
| - Add the `split-region-max-num` parameter in TiDB’s configuration files to modify the maximum number of Regions allowed by the `SPLIT TABLE` syntax, which is increased from 1,000 to 10,000 in the default configuration | ||
|
|
||
| ## TiDB | ||
|
|
||
| + SQL Optimizer | ||
| - Fix the issue that the error message is not returned correctly when an error occurs during `EvalSubquery` building `Executor` [#11811](https://github.com/pingcap/tidb/pull/11811) | ||
| - Fix the issue that the query result might be incorrect when the number of rows in the outer table is greater than that in a single batch in Index Lookup Join; expand the functional scope of Index Lookup Join; `UnionScan` can be used as a subnode of `IndexJoin` [#11843](https://github.com/pingcap/tidb/pull/11843) | ||
| - Add the display of invalid keys (like `invalid encoded key flag 252` ) in the `SHOW STAT_BUCKETS` syntax, for the situation where invalid keys might occur during the statistics feedback process [#12098](https://github.com/pingcap/tidb/pull/12098) | ||
| + SQL Execution Engine | ||
| - Fix some incorrect results (like `select cast(13835058000000000000 as double)`) caused by the number value that is first converted to `UINT` when the `CAST` function is converting the number value type [#11712](https://github.com/pingcap/tidb/pull/11712) | ||
| - Fix the issue that the calculation result might be incorrect when the dividend of the `DIV` calculation is a decimal and this calculation contains a negative number [#11812](https://github.com/pingcap/tidb/pull/11812) | ||
| - Add the `ConvertStrToIntStrict` function to fix the MySQL incompatibility issue caused by some strings being converted to the `INT` type when executing the `SELECT`/`EXPLAIN` statement [#11892](https://github.com/pingcap/tidb/pull/11892) | ||
| - Fix the issue that the `Explain` result might be incorrect caused by wrong configuration of `stmtCtx` when `EXPLAIN ... FOR CONNECTION` is used [#11978](https://github.com/pingcap/tidb/pull/11978) | ||
| - Fix the issue that the result returned by the `unaryMinus` function is incompatible with MySQL, caused by the non-decimal result when the integer result overflows [#11990](https://github.com/pingcap/tidb/pull/11990) | ||
| - Fix the issue that `last_insert_id()` might be incorrect, caused by the counting order when the `LOAD DATA` statement is being executed [#11994](https://github.com/pingcap/tidb/pull/11994) | ||
| - Fix the issue that `last_insert_id()` might be incorrect when the user writes auto-increment column data in an explicit-implicit mixed way [#12001](https://github.com/pingcap/tidb/pull/12001) | ||
| - Fix an over-quoted bug for the `JSON_UNQUOTE` function: only values enclosed by double quote marks (`"`) should be unquoted. For example, the result of “`SELECT JSON_UNQUOTE("\\\\")`” should be “`\\`” (not changed) [#12096](https://github.com/pingcap/tidb/pull/12096) | ||
| + Server | ||
| - Change `start ts` recorded in slow query logs from the last retry time to the first execution time when retrying TiDB transactions [#11878](https://github.com/pingcap/tidb/pull/11878) | ||
| - Add the number of keys of a transaction in `LockResolver` to avoid the scan operation on the whole Region and reduce costs of resolving locking when the number of keys is reduced [#11889](https://github.com/pingcap/tidb/pull/11889) | ||
| - Fix the issue that the `succ` field value might be incorrect in slow query logs [#11886](https://github.com/pingcap/tidb/pull/11886) | ||
| - Replace the `Index_ids` filed in slow query logs with the `Index_names` field to improve the usability of slow query logs [#12063](https://github.com/pingcap/tidb/pull/12063) | ||
| - Fix the connection break issue caused by TiDB parsing `-` into EOF Error when `Duration` contains `-` (like `select time(‘--’)`) [#11910](https://github.com/pingcap/tidb/pull/11910) | ||
| - Remove an invalid Region from `RegionCache` more quickly to reduce the number of requests sent to this Region [#11931](https://github.com/pingcap/tidb/pull/11931) | ||
| - Fix the connection break issue caused by incorrectly handling the OOM panic issue when `oom-action = "cancel"` and OOM occurs in the `Insert Into … Select` syntax [#12126](https://github.com/pingcap/tidb/pull/12126) | ||
| + DDL | ||
| - Add the reverse scan interface for `tikvSnapshot` to efficiently query DDL history jobs. After using this interface, the execution time of `ADMIN SHOW DDL JOBS` is remarkably decreased [#11789](https://github.com/pingcap/tidb/pull/11789) | ||
| - Improve the `CREATE TABLE ... PRE_SPLIT_REGION` syntax: change the number of pre-splitting Regions from 2^(N-1) to 2^N when `PRE_SPLIT_REGION = N` [#11797](https://github.com/pingcap/tidb/pull/11797/files) | ||
| - Decrease the default parameter value for the background worker thread of the `Add Index` operation to avoid great impacts on online workloads [#11875](https://github.com/pingcap/tidb/pull/11875) | ||
| - Improve the `SPLIT TABLE` syntax behavior: generate N data Region(s) and one index Region when `SPLIT TABLE ... REGIONS N` is used to divide Regions [#11929](https://github.com/pingcap/tidb/pull/11929) | ||
| - Add the `split-region-max-num` parameter (`10000` by default) in the configuration file to make the maximum number of Regions allowed by the `SPLIT TABLE` syntax adjustable [#12080](https://github.com/pingcap/tidb/pull/12080) | ||
| - Fix the issue that the `CREATE TABLE` clause cannot be parsed by the downstream MySQL, caused by uncommented `PRE_SPLIT_REGIONS` in this clause when the system writes the binlog [#12121](https://github.com/pingcap/tidb/pull/12121) | ||
| - Add the `WHERE` sub-clause in `SHOW TABLE … REGIONS` and `SHOW TABLE .. INDEX … REGIONS` [#12124](https://github.com/pingcap/tidb/pull/12124) | ||
| + Monitor | ||
| - Add the `connection_transient_failure_count` monitoring metric to count gRPC connection errors of `tikvclient` [#12092](https://github.com/pingcap/tidb/pull/12092) | ||
|
|
||
| ## TiKV | ||
|
|
||
| - Fix the incorrect result of counting keys in a Region in some cases [#5415](https://github.com/tikv/tikv/pull/5415) | ||
| - Add the `config-check` option in TiKV to check whether the TiKV configuration item is valid [#5391](https://github.com/tikv/tikv/pull/5391) | ||
| - Optimize the starting process to reduce jitters caused by restarting nodes [#5277](https://github.com/tikv/tikv/pull/5277) | ||
| - Optimize the resolving locking process in some cases to speed up resolving locking for transactions [#5339](https://github.com/tikv/tikv/pull/5339) | ||
| - Optimize the `get_txn_commit_info` process to speed up committing transactions [#5062](https://github.com/tikv/tikv/pull/5062) | ||
| - Simplify Raft-related logs [#5425](https://github.com/tikv/tikv/pull/5425) | ||
| - Resolve the issue that TiKV exits abnormally in some cases [#5441](https://github.com/tikv/tikv/pull/5441) | ||
|
|
||
| ## PD | ||
|
|
||
| - Add the `config-check` option in PD to check whether the PD configuration item is valid [#1725](https://github.com/pingcap/pd/pull/1725) | ||
| - Add the `remove-tomestone` command in pd-ctl to support clearing tombstone store records [#1705](https://github.com/pingcap/pd/pull/1705) | ||
| - Support actively pushing operators to speed up scheduling [#1686](https://github.com/pingcap/pd/pull/1686) | ||
|
|
||
| ## Tools | ||
|
|
||
| + TiDB Binlog | ||
| - Add `worker-count` and `txn-batch` configuration items in Reparo to control the recovery speed [#746](https://github.com/pingcap/tidb-binlog/pull/746) | ||
| - Optimize the memory usage of Drainer to improve the parallel execution efficiency [#735](https://github.com/pingcap/tidb-binlog/pull/735) | ||
| - Fix the bug that Pump cannot quit normally in some cases [#739](https://github.com/pingcap/tidb-binlog/pull/739) | ||
| - Optimize the processing logic of `LevelDB` in Pump to improve the execution efficiency of GC [#720](https://github.com/pingcap/tidb-binlog/pull/720) | ||
| + TiDB Lightning | ||
| - Fix the bug that tidb-lightning might crash caused by re-importing data from the checkpoint [#239](https://github.com/pingcap/tidb-lightning/pull/239) | ||
|
|
||
| ## TiDB Ansible | ||
|
|
||
| - Update the Spark version to 2.4.3, and update the TiSpark version to 2.2.0 that is compatible with Spark 2.4.3 [#914](https://github.com/pingcap/tidb-ansible/pull/914), [#919](https://github.com/pingcap/tidb-ansible/pull/927) | ||
| - Fix the issue that there is a long waiting time when the remote machine password has expired [#937](https://github.com/pingcap/tidb-ansible/pull/937), [#948](https://github.com/pingcap/tidb-ansible/pull/948) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| --- | ||
| title: TiDB 2.1.17 Release Notes | ||
| category: Releases | ||
| --- | ||
|
|
||
| # TiDB 2.1.17 Release Notes | ||
|
|
||
| Release date: September 11, 2019 | ||
|
|
||
| TiDB version: 2.1.17 | ||
|
|
||
| TiDB Ansible version: 2.1.17 | ||
|
|
||
| + New features | ||
| - Add the `WHERE` clause in TiDB’s `SHOW TABLE REGIONS` syntax | ||
| - Add the `config-check` feature in TiKV and PD to check the configuration items | ||
| - Add the `remove-tomestone` command in pd-ctl to clear tombstone store records | ||
| - Add the `worker-count` and `txn-batch` configuration items in Reparo to control the recovery speed | ||
|
|
||
| + Improvements | ||
| - Optimize PD’s scheduling process by supporting actively pushing operators | ||
| - Optimize TiKV’s starting process to reduce jitters caused by restarting nodes | ||
|
|
||
| + Changed behaviors | ||
| - Change `start ts` in TiDB slow query logs from the last retry time to the first execution time | ||
| - Replace the `Index_ids` field in TiDB slow query logs with the `Index_names` field to improve the usability of slow query logs | ||
| - Add the `split-region-max-num` parameter in TiDB’s configuration files to modify the maximum number of Regions allowed by the `SPLIT TABLE` syntax, which is increased from 1,000 to 10,000 in the default configuration | ||
|
|
||
| ## TiDB | ||
|
|
||
| + SQL Optimizer | ||
| - Fix the issue that the error message is not returned correctly when an error occurs during `EvalSubquery` building `Executor` [#11811](https://github.com/pingcap/tidb/pull/11811) | ||
| - Fix the issue that the query result might be incorrect when the number of rows in the outer table is greater than that in a single batch in Index Lookup Join; expand the functional scope of Index Lookup Join; `UnionScan` can be used as a subnode of `IndexJoin` [#11843](https://github.com/pingcap/tidb/pull/11843) | ||
| - Add the display of invalid keys (like `invalid encoded key flag 252` ) in the `SHOW STAT_BUCKETS` syntax, for the situation where invalid keys might occur during the statistics feedback process [#12098](https://github.com/pingcap/tidb/pull/12098) | ||
| + SQL Execution Engine | ||
| - Fix some incorrect results (like `select cast(13835058000000000000 as double)`) caused by the number value that is first converted to `UINT` when the `CAST` function is converting the number value type [#11712](https://github.com/pingcap/tidb/pull/11712) | ||
| - Fix the issue that the calculation result might be incorrect when the dividend of the `DIV` calculation is a decimal and this calculation contains a negative number [#11812](https://github.com/pingcap/tidb/pull/11812) | ||
| - Add the `ConvertStrToIntStrict` function to fix the MySQL incompatibility issue caused by some strings being converted to the `INT` type when executing the `SELECT`/`EXPLAIN` statement [#11892](https://github.com/pingcap/tidb/pull/11892) | ||
| - Fix the issue that the `Explain` result might be incorrect caused by wrong configuration of `stmtCtx` when `EXPLAIN ... FOR CONNECTION` is used [#11978](https://github.com/pingcap/tidb/pull/11978) | ||
| - Fix the issue that the result returned by the `unaryMinus` function is incompatible with MySQL, caused by the non-decimal result when the integer result overflows [#11990](https://github.com/pingcap/tidb/pull/11990) | ||
| - Fix the issue that `last_insert_id()` might be incorrect, caused by the counting order when the `LOAD DATA` statement is being executed [#11994](https://github.com/pingcap/tidb/pull/11994) | ||
| - Fix the issue that `last_insert_id()` might be incorrect when the user writes auto-increment column data in an explicit-implicit mixed way [#12001](https://github.com/pingcap/tidb/pull/12001) | ||
| - Fix an over-quoted bug for the `JSON_UNQUOTE` function: only values enclosed by double quote marks (`"`) should be unquoted. For example, the result of “`SELECT JSON_UNQUOTE("\\\\")`” should be “`\\`” (not changed) [#12096](https://github.com/pingcap/tidb/pull/12096) | ||
| + Server | ||
| - Change `start ts` recorded in slow query logs from the last retry time to the first execution time when retrying TiDB transactions [#11878](https://github.com/pingcap/tidb/pull/11878) | ||
| - Add the number of keys of a transaction in `LockResolver` to avoid the scan operation on the whole Region and reduce costs of resolving locking when the number of keys is reduced [#11889](https://github.com/pingcap/tidb/pull/11889) | ||
| - Fix the issue that the `succ` field value might be incorrect in slow query logs [#11886](https://github.com/pingcap/tidb/pull/11886) | ||
| - Replace the `Index_ids` filed in slow query logs with the `Index_names` field to improve the usability of slow query logs [#12063](https://github.com/pingcap/tidb/pull/12063) | ||
| - Fix the connection break issue caused by TiDB parsing `-` into EOF Error when `Duration` contains `-` (like `select time(‘--’)`) [#11910](https://github.com/pingcap/tidb/pull/11910) | ||
| - Remove an invalid Region from `RegionCache` more quickly to reduce the number of requests sent to this Region [#11931](https://github.com/pingcap/tidb/pull/11931) | ||
| - Fix the connection break issue caused by incorrectly handling the OOM panic issue when `oom-action = "cancel"` and OOM occurs in the `Insert Into … Select` syntax [#12126](https://github.com/pingcap/tidb/pull/12126) | ||
| + DDL | ||
| - Add the reverse scan interface for `tikvSnapshot` to efficiently query DDL history jobs. After using this interface, the execution time of `ADMIN SHOW DDL JOBS` is remarkably decreased [#11789](https://github.com/pingcap/tidb/pull/11789) | ||
| - Improve the `CREATE TABLE ... PRE_SPLIT_REGION` syntax: change the number of pre-splitting Regions from 2^(N-1) to 2^N when `PRE_SPLIT_REGION = N` [#11797](https://github.com/pingcap/tidb/pull/11797/files) | ||
| - Decrease the default parameter value for the background worker thread of the `Add Index` operation to avoid great impacts on online workloads [#11875](https://github.com/pingcap/tidb/pull/11875) | ||
| - Improve the `SPLIT TABLE` syntax behavior: generate N data Region(s) and one index Region when `SPLIT TABLE ... REGIONS N` is used to divide Regions [#11929](https://github.com/pingcap/tidb/pull/11929) | ||
| - Add the `split-region-max-num` parameter (`10000` by default) in the configuration file to make the maximum number of Regions allowed by the `SPLIT TABLE` syntax adjustable [#12080](https://github.com/pingcap/tidb/pull/12080) | ||
| - Fix the issue that the `CREATE TABLE` clause cannot be parsed by the downstream MySQL, caused by uncommented `PRE_SPLIT_REGIONS` in this clause when the system writes the binlog [#12121](https://github.com/pingcap/tidb/pull/12121) | ||
| - Add the `WHERE` sub-clause in `SHOW TABLE … REGIONS` and `SHOW TABLE .. INDEX … REGIONS` [#12124](https://github.com/pingcap/tidb/pull/12124) | ||
| + Monitor | ||
| - Add the `connection_transient_failure_count` monitoring metric to count gRPC connection errors of `tikvclient` [#12092](https://github.com/pingcap/tidb/pull/12092) | ||
|
|
||
| ## TiKV | ||
|
|
||
| - Fix the incorrect result of counting keys in a Region in some cases [#5415](https://github.com/tikv/tikv/pull/5415) | ||
| - Add the `config-check` option in TiKV to check whether the TiKV configuration item is valid [#5391](https://github.com/tikv/tikv/pull/5391) | ||
| - Optimize the starting process to reduce jitters caused by restarting nodes [#5277](https://github.com/tikv/tikv/pull/5277) | ||
| - Optimize the resolving locking process in some cases to speed up resolving locking for transactions [#5339](https://github.com/tikv/tikv/pull/5339) | ||
| - Optimize the `get_txn_commit_info` process to speed up committing transactions [#5062](https://github.com/tikv/tikv/pull/5062) | ||
| - Simplify Raft-related logs [#5425](https://github.com/tikv/tikv/pull/5425) | ||
| - Resolve the issue that TiKV exits abnormally in some cases [#5441](https://github.com/tikv/tikv/pull/5441) | ||
|
|
||
| ## PD | ||
|
|
||
| - Add the `config-check` option in PD to check whether the PD configuration item is valid [#1725](https://github.com/pingcap/pd/pull/1725) | ||
| - Add the `remove-tomestone` command in pd-ctl to support clearing tombstone store records [#1705](https://github.com/pingcap/pd/pull/1705) | ||
| - Support actively pushing operators to speed up scheduling [#1686](https://github.com/pingcap/pd/pull/1686) | ||
|
|
||
| ## Tools | ||
|
|
||
| + TiDB Binlog | ||
| - Add `worker-count` and `txn-batch` configuration items in Reparo to control the recovery speed [#746](https://github.com/pingcap/tidb-binlog/pull/746) | ||
| - Optimize the memory usage of Drainer to improve the parallel execution efficiency [#735](https://github.com/pingcap/tidb-binlog/pull/735) | ||
| - Fix the bug that Pump cannot quit normally in some cases [#739](https://github.com/pingcap/tidb-binlog/pull/739) | ||
| - Optimize the processing logic of `LevelDB` in Pump to improve the execution efficiency of GC [#720](https://github.com/pingcap/tidb-binlog/pull/720) | ||
| + TiDB Lightning | ||
| - Fix the bug that tidb-lightning might crash caused by re-importing data from the checkpoint [#239](https://github.com/pingcap/tidb-lightning/pull/239) | ||
|
|
||
| ## TiDB Ansible | ||
|
|
||
| - Update the Spark version to 2.4.3, and update the TiSpark version to 2.2.0 that is compatible with Spark 2.4.3 [#914](https://github.com/pingcap/tidb-ansible/pull/914), [#919](https://github.com/pingcap/tidb-ansible/pull/927) | ||
| - Fix the issue that there is a long waiting time when the remote machine password has expired [#937](https://github.com/pingcap/tidb-ansible/pull/937), [#948](https://github.com/pingcap/tidb-ansible/pull/948) |
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