Php-amqplib: stream_select() ErrorException FD_SETSIZE

[maprokopiou]

Hi,

I am receiving the following error during the publish to the queue

[object] (ErrorException(code: 0): stream_select(): You MUST recompile PHP with a larger value of FD_SETSIZE.\nIt is set to 1024, but you have descriptors numbered at least as high as 1094.
\n --enable-fd-setsize=2048 is recommended, but you may want to set it\nto equal the maximum number of open files supported by your system,\nin order to avoid seeing this error again at a later date. at php-amqplib/php-amqplib/PhpAmqpLib/Wire/IO/StreamIO.php:420

The error says that I am trying to do stream_select() with a file descriptor larger than 1024 (as high as 1094) which is the default for Linux systems.

Any idea as to why the error is occurring and do you know any techniques I can use to avoid it from happening again?

[lukebakken]

I ran a search that produced a wide variety of information about this error, which is PHP-specific and not related to this library.

[christianmeller]

Hi, I'm receiving the same error with v2.7.2 and php 7.1. When i downgrade the library back to v2.7.0 everything works like expected.

[lukebakken]

@christianmeller please provide code to reproduce this situation. I'll reopen this issue when that is provided. Thanks!

[maprokopiou]

By minimizing the FD_SIZE in our Linux system development environment we managed to make it work without, getting the error. The issue occurs when we do stream_select() with a file descriptor larger than 1024 and as @lukebakken this is a PHP related issue. Unfortunately i can't downgrade and reproduce this because we did a lot of work to bring the system FD_SIZE down so we can continue development. But stream_select() will eventually fail if you exceed FD_SIZE more than 1024 which makes me wonder if an alternative like php-pecl-amqp is a permanent solution