[Solved] Logstash can't start up: not enough memory

Elastic Stack Logstash
1

This is what top showed

top - 13:28:06 up 837 days, 15:14,  6 users,  load average: 0.17, 0.13, 0.16
Tasks: 352 total,   2 running, 350 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.3%us,  0.1%sy,  0.0%ni, 99.3%id,  0.0%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:  16432788k total,   830188k used, 15602600k free,     2576k buffers
Swap: 18481144k total,  2343896k used, 16137248k free,   141652k cached

I suppose the free memory was enough.

And I can't find any document about how to configure logstash's memory allocation.

Thank you for help.

2

You have tons of free memory. What's the exact error message and where did you find it? The Logstash log?

And I can't find any document about how to configure logstash's memory allocation.

The JVM heap size is configured via startup options that are normally set via /etc/default/logstash (Debian-based systems) or /etc/sysconfig/logstash (RPM-based systems).

1 Like
3

The error msg showed just I typed

$ ./logstash -h
Can't start up: not enough memory

I've tried set the env param export LS_HEAP_SIZE=500m, and logstash ran. But I couldn't figure out what happened.

4

Logstash is currently, by default started with heap config like https://github.com/elastic/logstash/blob/master/pkg/jvm.options#L6-L7, you can see it does between Xms256m and -Xmx1g, so you should be covered.

can you share with us your logstash version? and machine specs? as @magnusbaeck said from your top command it really looks like you got enough memory.

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5

I solved this problem by upgrading java from 1.4 to 1.8.

It seemed the problem was caused by low java version.

Thank you for help.