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update tidb v4.0.12 release notes (#5090)
* update v4.0.12 release notes at 2021-03-23T19:50:59 Signed-off-by: ti-srebot <ti-srebot@pingcap.com> * add TOC * Update release-4.0.12.md * update v4.0.12 release notes at 2021-03-26T16:06:43 Signed-off-by: ti-srebot <ti-srebot@pingcap.com> * Update releases/4.0.12.md * update * update TiDB and TiFlash notes * Update release-4.0.12.md * add tools and tikv and pd * adjust the position of PD notes * refine language * refine language1 * refine language * Apply suggestions from code review Co-authored-by: Grace Cai <qqzczy@126.com> * Update releases/release-4.0.12.md Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com> Co-authored-by: Grace Cai <qqzczy@126.com>
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| title: TiDB 4.0.12 Release Notes | ||
| --- | ||
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| # TiDB 4.0.12 Release Notes | ||
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| Release date: April 2, 2021 | ||
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| TiDB version: 4.0.12 | ||
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| ## New Features | ||
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| + TiFlash | ||
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| - Add tools to check the status of `tiflash replica` for online rolling updates | ||
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| ## Improvements | ||
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| + TiDB | ||
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| - Refine the output information of the `EXPLAIN` statement for the `batch cop` mode [#23164](https://github.com/pingcap/tidb/pull/23164) | ||
| - Add the warning information for expressions that cannot be pushed to the storage layer in the output of the `EXPLAIN` statement [#23020](https://github.com/pingcap/tidb/pull/23020) | ||
| - Migrate a part of the DDL package code from `Execute`/`ExecRestricted` to the safe API (2) [#22935](https://github.com/pingcap/tidb/pull/22935) | ||
| - Migrate a part of the DDL package code from `Execute`/`ExecRestricted` to the safe API (1) [#22929](https://github.com/pingcap/tidb/pull/22929) | ||
| - Add `optimization-time` and `wait-TS-time` into the slow log [#22918](https://github.com/pingcap/tidb/pull/22918) | ||
| - Support querying `partition_id` from the `infoschema.partitions` table [#22489](https://github.com/pingcap/tidb/pull/22489) | ||
| - Add `last_plan_from_binding` to help the users know whether a SQL statement's execution plan is matched with the hints in the binding [#21430](https://github.com/pingcap/tidb/pull/21430) | ||
| - Scatter truncated tables without the `pre-split` option [#22872](https://github.com/pingcap/tidb/pull/22872) | ||
| - Add three format specifiers for the `str_to_date` expression [#22812](https://github.com/pingcap/tidb/pull/22812) | ||
| - Record the `PREPARE` execution failure as `Failed Query OPM` in the metrics monitor [#22672](https://github.com/pingcap/tidb/pull/22672) | ||
| - Do not report errors for the `PREPARE` execution if `tidb_snapshot` is set [#22641](https://github.com/pingcap/tidb/pull/22641) | ||
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| + TiKV | ||
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| - Prevent a large number of reconnections in a short period of time [#9879](https://github.com/tikv/tikv/pull/9879) | ||
| - Optimize the write operations and Batch Get in the scenarios of many tombstones [#9729](https://github.com/tikv/tikv/pull/9729) | ||
| - Change the default value of `leader-transfer-max-log-lag` to `128` to increase the success rate of leader transfer [#9605](https://github.com/tikv/tikv/pull/9605) | ||
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| + PD | ||
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| - Update the Region cache only when `pending-peers` or `down-peers` changes, which reduces the pressure of updating heartbeats [#3471](https://github.com/pingcap/pd/pull/3471) | ||
| - Prevent the Regions in `split-cache` from becoming the target of merge [#3459](https://github.com/pingcap/pd/pull/3459) | ||
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| + TiFlash | ||
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| - Optimize the configuration file and remove useless items | ||
| - Reduce the size of TiFlash binary files | ||
| - Use an adaptive aggressive GC strategy to reduce memory usage | ||
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| + Tools | ||
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| + TiCDC | ||
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| - Add a double confirmation when users create or resume the changefeed with the `start-ts` or `checkpoint-ts` 1 day before the current timestamp [#1497](https://github.com/pingcap/ticdc/pull/1497) | ||
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| + Backup & Restore (BR) | ||
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| - Log the `HTTP_PROXY` and `HTTPS_PROXY` environmental variables [#827](https://github.com/pingcap/br/pull/827) | ||
| - Improve the backup performance when there are many tables [#745](https://github.com/pingcap/br/pull/745) | ||
| - Report errors if the service safe point check fails [#826](https://github.com/pingcap/br/pull/826) | ||
| - Add the `cluster_version` and `br_version` information in `backupmeta` [#803](https://github.com/pingcap/br/pull/803) | ||
| - Add retry for external storage errors to increase the success rate of backup [#851](https://github.com/pingcap/br/pull/851) | ||
| - Reduce memory usage during backup [#886](https://github.com/pingcap/br/pull/886) | ||
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| + TiDB Lightning | ||
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| - Check the TiDB cluster version before running TiDB Lightning to avoid unexpected errors [#787](https://github.com/pingcap/br/pull/787) | ||
| - Fail fast when TiDB Lightning meets the `cancel` error [#867](https://github.com/pingcap/br/pull/867) | ||
| - Add `tikv-importer.engine-mem-cache-size` and `tikv-importer.local-writer-mem-cache-size` configuration items to balance between memory usage and performance [#866](https://github.com/pingcap/br/pull/866) | ||
| - Run `batch split region` in parallel for TiDB Lightning's Local-backend to increase the import speed [#868](https://github.com/pingcap/br/pull/868) | ||
| - When using TiDB Lightning to import data from a S3 storage, TiDB Lightning no longer requires the `s3:ListBucket` permission [#919](https://github.com/pingcap/br/pull/919) | ||
| - When resuming from a checkpoint, TiDB Lightning keeps using the original engine [#924](https://github.com/pingcap/br/pull/924) | ||
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| ## Bug Fixes | ||
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| + TiDB | ||
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| - Fix the issue that the `get` variable expression goes wrong when the session variable is hexadecimal literals[#23372](https://github.com/pingcap/tidb/pull/23372) | ||
| - Fix the issue that wrong collation is used when creating the fast execution plan for the `Enum` or `Set` type [#23292](https://github.com/pingcap/tidb/pull/23292) | ||
| - Fix the possible wrong result of the `nullif` expression when it is used with `is-null` [#23279](https://github.com/pingcap/tidb/pull/23279) | ||
| - Fix the issue that the auto-analysis is triggered outside its time range [#23219](https://github.com/pingcap/tidb/pull/23219) | ||
| - Fix the issue that the `CAST` function might ignore errors for the `point get` plan [#23211](https://github.com/pingcap/tidb/pull/23211) | ||
| - Fix a bug that prevents SPM from taking effect when `CurrentDB` is empty [#23209](https://github.com/pingcap/tidb/pull/23209) | ||
| - Fix the issue of possible wrong table filters for the IndexMerge plan [#23165](https://github.com/pingcap/tidb/pull/23165) | ||
| - Fix the issue of unexpected `NotNullFlag` in the returning types of the `NULL` constant [#23135](https://github.com/pingcap/tidb/pull/23135) | ||
| - Fix a bug that collation might not be handled by the text type [#23092](https://github.com/pingcap/tidb/pull/23092) | ||
| - Fix the issue that the range partition might incorrectly handle the `IN` expression [#23074](https://github.com/pingcap/tidb/pull/23074) | ||
| - Fix the issue that after marking a TiKV store as tombstone, starting new TiKV stores with different StoreIDs with the same IP address and port keeps returning the `StoreNotMatch` error [#23071](https://github.com/pingcap/tidb/pull/23071) | ||
| - Do not adjust the `INT` type when it is `NULL` and compared with `YEAR` [#22844](https://github.com/pingcap/tidb/pull/22844) | ||
| - Fix the issue of lost connection when loading data on tables with the `auto_random` column [#22736](https://github.com/pingcap/tidb/pull/22736) | ||
| - Fix the issue of DDL hangover when the DDL operation meets panic in the cancelling path [#23297](https://github.com/pingcap/tidb/pull/23297) | ||
| - Fix the wrong key range of index scan when comparing the `YEAR` column with `NULL` [#23104](https://github.com/pingcap/tidb/pull/23104) | ||
| - Fix the issue that a successfully created view is failed to use [#23083](https://github.com/pingcap/tidb/pull/23083) | ||
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| + TiKV | ||
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| - Fix the issue that the `IN` expression does not properly handle unsigned/signed integers [#9850](https://github.com/tikv/tikv/pull/9850) | ||
| - Fix the issue that the ingest operation is not re-entrant [#9779](https://github.com/tikv/tikv/pull/9779) | ||
| - Fix the issue that the space is missed when converting JSON to string in TiKV coprocessor [#9666](https://github.com/tikv/tikv/pull/9666) | ||
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| + PD | ||
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| - Fix a bug that the isolation level is wrong when the store lacks the label [#3474](https://github.com/pingcap/pd/pull/3474) | ||
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| + TiFlash | ||
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| - Fix the issue of incorrect execution results when the default value of the `binary` type column contains leading or tailing zero bytes | ||
| - Fix a bug that TiFlash fails to synchronize schema if the name of the database contains special characters | ||
| - Fix the issue of incorrect results when handling the `IN` expression with decimal values | ||
| - Fix a bug that the metric for the opened file count shown in Grafana is high | ||
| - Fix a bug that TiFlash does not support the `Timestamp` literal | ||
| - Fix the potential not responding issue while handling the `FROM_UNIXTIME` expression | ||
| - Fix the issue of incorrect results when casting string as integer | ||
| - Fix a bug that the `like` function might return wrong results | ||
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| + Tools | ||
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| + TiCDC | ||
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| - Fix a disorder issue of the `resolved ts` event [#1464](https://github.com/pingcap/ticdc/pull/1464) | ||
| - Fix a data loss issue caused by wrong table scheduling due to the network problem [#1508](https://github.com/pingcap/ticdc/pull/1508) | ||
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| + Backup & Restore (BR) | ||
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| - Fix a bug that `WalkDir` for the s3 storage returns `nil` if the target path is bucket name [#733](https://github.com/pingcap/br/pull/733) | ||
| - Fix a bug that the `status` port is not served with TLS [#839](https://github.com/pingcap/br/pull/839) | ||
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| + TiDB Lightning | ||
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| - Fix the error that TiKV Importer might ignore that the file has already existed [#848](https://github.com/pingcap/br/pull/848) | ||
| - Fix a bug that the TiDB Lightning might use the wrong timestamp and read the wrong data [#850](https://github.com/pingcap/br/pull/850) | ||
| - Fix a bug that TiDB Lightning's unexpected exit might cause damaged checkpoint file [#889](https://github.com/pingcap/br/pull/889) | ||
| - Fix the issue of possible data error that occurs because the `cancel` error is ignored [#874](https://github.com/pingcap/br/pull/874) |
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