# WAIT

> Wait for replica acknowledgements.

Use `WAIT` to block until preceding writes have been acknowledged by a number of replicas, or until a timeout expires.

The reply is the number of replicas that acknowledged, which can be lower than `<numreplicas>` when the timeout is reached, so callers must check it instead of assuming success. A timeout of `0` waits indefinitely.

`WAIT` raises the durability you can observe for a write, which is useful right before an action that must not be undone by a failover, such as replying to a payment webhook. It does not make Redis strongly consistent: an acknowledged write can still be lost if the primary and the acknowledging replicas fail together.

On Upstash the command waits for the writes enqueued before it began, including writes made by other connections, which is broader than the per-connection wording used by some Redis clients.

## Syntax

```redis
WAIT <numreplicas> <timeout>
```

## Arguments

| Argument | Required | Repeatable | Description |
| --- | --- | --- | --- |
| `numreplicas` | Yes | No | Non-negative number of replicas that should acknowledge prior writes on this connection. |
| `timeout` | Yes | No | Maximum wait in milliseconds; `0` means no timeout. |

## Important points

- This deployment waits for writes enqueued before `WAIT` begins, including writes from other connections. That is broader than the per-connection wording used by Redis clients.
- The reply can be lower than `numreplicas` when the timeout expires. This improves observed replication durability but does not make Redis a strongly consistent store.

## Response

The reply reports the result of the operation. Error replies have the same shape in RESP2 and RESP3 and are surfaced as exceptions by the SDKs below.

| Protocol | Reply |
| --- | --- |
| RESP2 | Integer |
| RESP3 | Integer |

<Note>
  Client libraries often decode bulk strings, maps, sets, and numeric strings into language-native values. The table describes the Redis wire reply.
</Note>

## Examples

TCP examples use the TLS `REDIS_URL` from the Upstash console. REST examples use `UPSTASH_REDIS_REST_URL` and `UPSTASH_REDIS_REST_TOKEN`.

<AccordionGroup>

<Accordion title="Redis CLI" icon="terminal">

```bash
WAIT 1 1000
```

</Accordion>

<Accordion title="@upstash/redis" icon="node-js" iconType="brands">

<Note>
  This command is not supported yet in `@upstash/redis`.
</Note>

</Accordion>

<Accordion title="upstash_redis" icon="python" iconType="brands">

<Note>
  This command is not supported yet in `upstash_redis`.
</Note>

</Accordion>

<Accordion title="ioredis" icon="node-js" iconType="brands">

```ts
import Redis from "ioredis";

const redis = new Redis(process.env.REDIS_URL!);
const result = await redis.wait("1", "1000");
console.log(result);
```

</Accordion>

<Accordion title="node-redis" icon="node-js" iconType="brands">

```ts
import { createClient } from "redis";

const client = await createClient({ url: process.env.REDIS_URL })
  .on("error", console.error)
  .connect();
const result = await client.wait(1, 1000);
console.log(result);
```

</Accordion>

<Accordion title="redis-py" icon="python" iconType="brands">

```python
import os
import redis

client = redis.from_url(os.environ["REDIS_URL"])
result = client.wait("1", "1000")
print(result)
```

</Accordion>

<Accordion title="go-redis" icon="golang" iconType="brands">

```go
package main

import (
    "context"
    "fmt"
    "os"
    "time"

    "github.com/redis/go-redis/v9"
)

func main() {
    opts, err := redis.ParseURL(os.Getenv("REDIS_URL"))
    if err != nil {
        panic(err)
    }
    client := redis.NewClient(opts)
    result, err := client.Wait(context.Background(), 1, time.Second).Result()
    if err != nil {
        panic(err)
    }
    fmt.Println(result)
}
```

</Accordion>

<Accordion title="jedis" icon="java" iconType="brands">

```java
import java.net.URI;

import redis.clients.jedis.Jedis;

try (Jedis jedis = new Jedis(new URI(System.getenv("REDIS_URL")))) {
  Object result = jedis.waitReplicas(1, 1000);
  System.out.println(result);
}
```

</Accordion>

<Accordion title="redis-rs" icon="rust" iconType="brands">

```rust
fn main() -> redis::RedisResult<()> {
    let url = std::env::var("REDIS_URL").expect("REDIS_URL is not set");
    let client = redis::Client::open(url)?;
    let mut connection = client.get_connection()?;

    let mut command = redis::cmd("WAIT");
    command.arg("1");
    command.arg("1000");
    let result: redis::Value = command.query(&mut connection)?;
    println!("{result:?}");
    Ok(())
}
```

</Accordion>

</AccordionGroup>