PHP Redis timeout, read error on connection?

Question

"PHP Fatal error: Uncaught exception 'RedisException' with message 'read error on connection'"

The driver here is phpredis

$redis->blpop('a', 0);

This always times out after ~1 minute. My redis.conf says timeout 0 and $redis->getOption(Redis::OPT_READ_TIMEOUT) returns double(0)

If I do this it has never timed out $redis->setOption(Redis::OPT_READ_TIMEOUT, -1);

Why do I need -1? Redis documentation says timeout 0 in redis.conf should never time me out.

"By default recent versions of Redis don't close the connection with the client if the client is idle for many seconds: the connection will remain open forever."

Answer 1

The current solution I know of is to disable persistent connections for phpredis, as they have been reported as buggy since October 2011. If you’re using php-fpm or other threaded models, the library specifically disables persistent connections.

Reducing the frequency of this error might be possible by adjusting the php.ini default_socket_timeout value.

Additionally, read timeout configurations in phpredis are not universally supported. The feature (look for OPT_READ_TIMEOUT) was introduced in tag 2.2.3.