I get this error when trying locally: Slot refresh error.

[KabDeveloper]

Hi,

For test, I am using one redis server only on Windows.

When I launch a test, I am getting this error message:

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error(Some("Slot refresh error."))', src\libcore\result.rs:999:5
stack backtrace:
   0: std::sys_common::backtrace::_print
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\/src\libstd\sys_common\backtrace.rs:71
   1: std::panicking::default_hook::{{closure}}
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\/src\libstd\panicking.rs:197
   2: std::panicking::default_hook
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\/src\libstd\panicking.rs:211
   3: std::panicking::rust_panic_with_hook
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\/src\libstd\panicking.rs:474
   4: std::panicking::continue_panic_fmt
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\/src\libstd\panicking.rs:381
   5: std::panicking::rust_begin_panic
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\/src\libstd\panicking.rs:308
   6: core::panicking::panic_fmt
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\/src\libcore\panicking.rs:85
   7: core::result::unwrap_failed<r2d2::Error>
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\src\libcore\macros.rs:18
   8: core::result::Result<r2d2::Pool<r2d2_redis_cluster::RedisClusterConnectionManager>, r2d2::Error>::unwrap<r2d2::Pool<r2d2_redis_cluster::RedisClusterConnectionManager>,r2d2::Error>
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\src\libcore\result.rs:800
   9: test::main
             at .\src\main.rs:97
  10: std::rt::lang_start::{{closure}}<core::result::Result<(), std::io::error::Error>>
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\src\libstd\rt.rs:64
  11: std::panicking::try::do_call<closure,i32>
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\/src\libstd\panicking.rs:293
  12: panic_unwind::__rust_maybe_catch_panic
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\/src\libpanic_unwind\lib.rs:85
  13: std::rt::lang_start_internal
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\/src\libstd\rt.rs:48
  14: std::rt::lang_start<core::result::Result<(), std::io::error::Error>>
             at /rustc/a53f9df32fbb0b5f4382caaad8f1a46f36ea887c\src\libstd\rt.rs:64
  15: main
  16: __scrt_common_main_seh
             at f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283
  17: BaseThreadInitThunk
  18: RtlUserThreadStart
error: process didn't exit successfully: `target\debug\test.exe` (exit code: 101)

Using the example code in the readme:

extern crate r2d2_redis_cluster;

use std::thread;

use r2d2_redis_cluster::{r2d2::Pool, Commands, RedisClusterConnectionManager};

fn main() {
    let redis_uri = vec!["redis://127.0.0.1:6379"];
    let manager = RedisClusterConnectionManager::new(redis_uri).unwrap();
    let pool = Pool::builder()
        .build(manager)
        .unwrap();

    let mut handles = Vec::new();

    for _ in 0..10 {
        let pool = pool.clone();
        handles.push(thread::spawn(move || {
            let connection = pool.get().unwrap();
            let n: u64 = connection.incr("test", 1).unwrap();
        }));
    }

    for h in handles {
        h.join().unwrap();
    }

    let connection = pool.get().unwrap();
    let res: u64 = connection.get("test").unwrap();

    assert_eq!(res, 10);
}

Please help to get it running !

[atuk721]

Redis cluster needs at least three master nodes.
Please confirm below.

https://redis.io/topics/cluster-tutorial

Note that the minimal cluster that works as expected requires to contain at least three master nodes.

[KabDeveloper]

@atuk721 Why not adding support for both: Redis alone + Cluster ?

I can't find a good tutorial for Windows, will try and let you know.

[KabDeveloper]

@atuk721 I created a Redis Cluster on my computer: 2 Slave + 1 Master

But still getting the same error message :(

How to solve it please ? Thank you

[atuk721]

@bcashier
I think you don't have right Redis cluster configuration.
Please run the following command, then confirm slots data are returned.

redis-cli cluster slots

I think you didn't execute "redis-cli --cluster create" command of bellow after start Redis cluster.

https://redis.io/topics/cluster-tutorial

[atuk721]

@bcashier
If you don't need using Redis cluster, use below.

https://github.com/mitsuhiko/redis-rs
https://github.com/sorccu/r2d2-redis

[KabDeveloper]

@atuk721
I need to use Redis Cluster for my project unfortunatelly.

It seem that this working on Linux but not on Windows.

I will use https://github.com/sorccu/r2d2-redis for test, and then switch to urs when releasing the app.

[atuk721]

@bcashier

It seem that this working on Linux but not on Windows.

I don't think so.
You said to create cluster of "2 Slave + 1 Master", but Redis cluster needs "3 Master".
"Cluster" and "Replication" are not same.
This library is only for cluster now.

If you mean to need cluster, please show me a result to execute below command.

redis-cli cluster slots

If blank is returned, it doesn't set to configure Redis cluster.

[KabDeveloper]

@atuk721 When I launch that command, I receive this error message:

(error) ERR This instance has cluster support disabled

Thanks