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tools: minor update for drainer's relay log #2308

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Feb 26, 2020
Merged

tools: minor update for drainer's relay log #2308

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2 changes: 1 addition & 1 deletion reference/tidb-binlog/relay-log.md
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Expand Up @@ -35,7 +35,7 @@ Drainer 开启 relay log 后会先将 binlog event 写到磁盘上，然后再

### Drainer 从 relay log 消费 binlog 的触发场景

如果 Drainer 启动时无法连接到上游集群的 PD，并且探测到 checkpoint 的 `consistent = false`，此时会尝试读取 relay log，并将下游集群恢复到一致的状态。然后 Drainer 进程将 checkpoint 的 `status` 设置为 `0` 后主动退出。
如果 Drainer 启动时无法连接到上游集群的 PD，并且探测到 checkpoint 的 `consistent = false`，此时会尝试读取 relay log，并将下游集群恢复到一致的状态。然后 Drainer 进程将 checkpoint 的 `consistent` 设置为 `true` 后主动退出。

### Relay log 的清理（GC）机制

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