relay: Interrupted system call (RELAY_ERR_IO)

Description

I am using Relay as a replacement for php-redis/predis in a Laravel 10 project.

Now with Relay, I see poll(2): Interrupted system call (RELAY_ERR_IO; cache.c:551).

This only happens on a server (queue worker) on a more remote location with more latency (around 100-200ms max.) to the Redis server, which is located in Germany and the worker in the USA (Miami).

Expected Behavior

Queue should not throw exceptions.

Actual Behavior

Throws the described exception at random times. Queue still works, but is logging this exception sometimes.

Possible Fix

Steps to Reproduce

Almost impossible, but:

1. Run a Redis server on location A and a worker that connects to it on Location B, other side of the world
2. Wait for a couple of hours, it should start throwing errors4.

Additional context

Before, I noticed different errors with php-redis that were common, but couldn’t be solved..

Apologies in advance for the lack of information. I’ll update this issue as I discover more details.

Relay diagnostics

$ php --ri relay

relay

Relay Support => enabled
Relay Version => 0.6.4
Available cache => 352
Available serializers => php, json, igbinary, msgpack
Available compression => lzf, zstd, lz4
Binary UUID => c773e2de-231e-484c-86d4-e51114e00975
Git SHA =>
Allocator => relay
License state => unknown
License memory cap => 0
License request id =>
relay.enabled => false
relay.key =>
relay.maxmemory => 0
relay.maxmemory_pct => 95
relay.eviction_policy => noeviction
relay.eviction_sample_keys => 128
relay.initial_readers => 128
relay.invalidation_poll_usec => 5
relay.pconnect_default => 1
relay.max_endpoint_dbs => 32
relay.loglevel => none
relay.logfile =>

Environment

• Operating System and version: Ubuntu 22.04.2 LTS (GNU/Linux 5.15.0-72-generic x86_64)
• PHP version: 8.2.6
• Laravel v10.11.0