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zh: refine TiDB-Binlog relay log (#4867) #4871

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Nov 11, 2020
Merged

zh: refine TiDB-Binlog relay log (#4867) #4871

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5 changes: 4 additions & 1 deletion tidb-binlog/tidb-binlog-relay-log.md
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Expand Up @@ -38,7 +38,7 @@ Drainer 开启 relay log 后会先将 binlog event 写到磁盘上，然后再

### Relay log 的清理（GC）机制

Drainer 在运行时，如果确认已经将一个 relay log 文件的全部数据都成功同步到下游了，就会马上删除这个文件，所以 relay log 不会占用过多空间。一个 relay log 文件大小达到 10MB（默认）时就会做切分，数据开始写入新的 relay log 文件。
Drainer 在将数据同步到下游之前，会先将数据写入到 relay log 文件中。当一个 relay log 文件大小达到 10MB（默认）并且当前事务的 binlog 数据被写入完成后，Drainer 就会开始将数据写入到下一个 relay log 文件中。当 Drainer 将数据成功同步到下游后，就会自动清除当前正在写入的 relay log 文件以外其他已完成同步的 relay log 文件。

## 配置

Expand All @@ -51,4 +51,7 @@ Drainer 在运行时，如果确认已经将一个 relay log 文件的全部数
# 保存 relay log 的目录，空值表示不开启。
# 只有下游是 TiDB 或 MySQL 时该配置才有生效。
log-dir = "/dir/to/save/log"
# 单个 relay log 文件大小限制（单位：字节）。
# 超出该值后会将 binlog 数据写入到下一个 relay log 文件。
max-file-size = 10485760
```