Fix broken links (#6837)

.github/workflows/link-check.yaml

@@ -4,7 +4,7 @@ on: [pull_request]
 
 jobs:
   base:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     steps:
       - name: Check out code
         uses: actions/checkout@v2

adopters.md

@@ -26,7 +26,6 @@ This is a list of TiDB adopters in various industries.
 |[Meituan](https://www.crunchbase.com/organization/meituan)|E-commerce|English [#1](https://pingcap.com/case-studies/migrating-from-mysql-to-a-scale-out-database-to-serve-our-290-million-monthly-users), [#2](https://pingcap.com/case-studies/how-we-use-a-mysql-alternative-to-avoid-sharding-and-provide-strong-consistency); [Chinese](https://pingcap.com/zh/case/user-case-meituandianping)|
 |[Happigo.com](https://www.crunchbase.com/organization/happigo-com)|E-commerce||
 |[Yimutian](https://www.crunchbase.com/organization/yimutian)|E-commerce||
-|[Youju Tech](https://nn.yjyz.com/)|E-commerce||
 |[Maizuo](https://www.crunchbase.com/organization/maizhuo)|E-commerce||
 |[Mogujie](https://www.crunchbase.com/organization/mogujie)|E-commerce||
 |[Zhihu](https://en.wikipedia.org/wiki/Zhihu)|Knowledge Sharing|English [#1](https://pingcap.com/case-studies/lesson-learned-from-queries-over-1.3-trillion-rows-of-data-within-milliseconds-of-response-time-at-zhihu/), [#2](https://pingcap.com/case-studies/horizontally-scaling-hive-metastore-database-by-migrating-from-mysql-to-tidb), [#3](https://pingcap.com/case-studies/boosting-big-data-performance-by-combining-tidb-with-hive-and-hdfs)|

connectors-and-apis.md

@@ -74,7 +74,7 @@ The third-party APIs are not developed by Oracle. The following table lists the
 | Ruby           | MySQL/Ruby                               | `libmysqlclient`                 | Uses `libmysqlclient`. See [Section 27.12.1, “The MySQL/Ruby API”](https://dev.mysql.com/doc/refman/5.7/en/apis-ruby-mysqlruby.html) |
 |                | Ruby/MySQL                               | Native Driver                    | See [Section 27.12.2, “The Ruby/MySQL API”](https://dev.mysql.com/doc/refman/5.7/en/apis-ruby-rubymysql.html) |
 | Scheme         | `Myscsh`                                 | `libmysqlclient`                 | See [`Myscsh`](https://github.com/aehrisch/myscsh) |
-| SPL            | `sql_mysql`                              | `libmysqlclient`                 | See [`sql_mysql` for SPL](http://www.clifford.at/spl/spldoc/sql_mysql.html) |
+| SPL            | `sql_mysql`                              | `libmysqlclient`                 | See `sql_mysql` for SPL |
 | Tcl            | MySQLtcl                                 | `libmysqlclient`                 | See [Section 27.13, “MySQL Tcl API”](https://dev.mysql.com/doc/refman/5.7/en/apis-tcl.html) |
 
 ## Connector versions supported by TiDB

tidb-binlog/binlog-consumer-client.md

@@ -118,7 +118,7 @@ message Binlog {
 }
 ```
 
-For the definition of the data format, see [`binlog.proto`](https://github.com/pingcap/tidb-tools/blob/master/tidb-binlog/proto/proto/binlog.proto).
+For the definition of the data format, see [`secondary_binlog.proto`](https://github.com/pingcap/tidb-tools/blob/master/tidb-binlog/proto/proto/secondary_binlog.proto)
 
 ### Driver
 

tidb-binlog/tidb-binlog-overview.md

@@ -71,7 +71,7 @@ The TiDB Binlog cluster is composed of Pump and Drainer.
 
 * Drainer supports replicating binlogs to MySQL, TiDB, Kafka or local files. If you need to replicate binlogs to other Drainer unsuppored destinations, you can set Drainer to replicate the binlog to Kafka and read the data in Kafka for customized processing according to binlog consumer protocol. See [Binlog Consumer Client User Guide](/tidb-binlog/binlog-consumer-client.md).
 
-* To use TiDB Binlog for recovering incremental data, set the config `db-type` to `file` (local files in the proto buffer format). Drainer converts the binlog to data in the specified [proto buffer format](https://github.com/pingcap/tidb-binlog/blob/master/proto/binlog.proto) and writes the data to local files. In this way, you can use [Reparo](/tidb-binlog/tidb-binlog-reparo.md) to recover data incrementally.
+* To use TiDB Binlog for recovering incremental data, set the config `db-type` to `file` (local files in the proto buffer format). Drainer converts the binlog to data in the specified [proto buffer format](https://github.com/pingcap/tidb-binlog/blob/master/proto/pb_binlog.proto) and writes the data to local files. In this way, you can use [Reparo](/tidb-binlog/tidb-binlog-reparo.md) to recover data incrementally.
 
     Pay attention to the value of `db-type`: