Logstash fails to start the simplest pipeline

[letharion]

# java -version
openjdk version "1.8.0_111"
OpenJDK Runtime Environment (build 1.8.0_111-8u111-b14-2ubuntu0.16.04.2-b14)
OpenJDK 64-Bit Server VM (build 25.111-b14, mixed mode)

# bin/logstash --version
logstash 5.0.1

# time bin/logstash -e 'input { stdin { } } output { stdout {} }'
^C
real    4m34.311s
user    0m13.224s
sys     0m0.268s

# cat /etc/issue
Ubuntu 16.04.1 LTS \n \l

Freshly installed ubuntu VM, with logstash pulled in from the official deb packages as shown here: https://www.elastic.co/guide/en/logstash/current/installing-logstash.html

Tried running as root to avoid any sort of permissions issue, which doesn't help.

[magnusbaeck (Magnus Bäck)]

On a first look things looked normal since you weren't supplying anything on stdin so Logstash would naturally wait for input, but a) unless this has changed in Logstash 5 it'll log something to stdout to indicate that it's alive and b) 13 seconds of CPU time just for starting up sounds excessive.

Have you tried bumping up the log level?

[letharion]

It turned out that if I had waited just a little longer, after about 5 minutes logstash does start and work as expected.
Not quite sure what the 5 minute mark was about, some kind of timeout perhaps, but what it's waiting for was unclear to me.

In either case I moved on with the setup, and got logstash working, so while the time it took for logstash to start in my example was annoying, ultimately it turned out to be a red herring. It does not take 5 min for logstash to start up when the full setup is inplace, as opposed to the the inline config sample above.