# Java error when too many conditions in Logstash

**URL:** <https://discuss.elastic.co/t/java-error-when-too-many-conditions-in-logstash/221466>\
**Category:** Logstash\
**Created:** [February 28, 2020, 5:13pm UTC](https://discuss.elastic.co/t/java-error-when-too-many-conditions-in-logstash/221466 "2020-02-28T17:13:11Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![syunusic](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/syunusic/32/4131_2.png) [@syunusic](https://discuss.elastic.co/u/syunusic)\
**Post date:** [February 28, 2020, 5:13pm UTC](https://discuss.elastic.co/t/java-error-when-too-many-conditions-in-logstash/221466/1 "2020-02-28T17:13:12Z")

</div>

I have a source (CSV) that has one field called EVENTNO. In that field are numbers (INT).  
In another document I have what EVENTNO number means (e.g. "1" = "The machine is off", "2" = "The machine is on", and so on). That document has more than 22,000 entries. One entry by every possible EVENTNO value.  
I want to have the meaning of the EVENTNO field instead of just the number, so what I tried was to use patterns. Something like:

```auto
filter
{
	csv { separator => ";" columns => ["DEVICEID","TIMESTAMP","MESSAGENO","ORGMESSAGE","SERVERTIMESTAMP","DEVICESTATE","EVENTNO","EVENTCOUNT","EVENTGROUPID"]}
		grok 
		{
                	match => 
			[
EVENTNO, "%{eventno_0}",
EVENTNO, "%{eventno_1}",
EVENTNO, "%{eventno_2}",
...

```

and then, in the patterns folder I have a file like this:

```auto
eventno_0 Yes
eventno_1 The machine is off 
eventno_2 The machine is on
eventno_3 hello 
...

```

I ran it and after 45 minutes just waiting and consuming a lot of memory (I change the memory limits to 8G in a 16G machine) I got a java heap error.  
Then I try another aproach:

```auto
filter
{
    csv { separator => ";" columns => ["DEVICEID","TIMESTAMP","MESSAGENO","ORGMESSAGE","SERVERTIMESTAMP","DEVICESTATE","EVENTNO","EVENTCOUNT","EVENTGROUPID"]}
    if [EVENTNO] =="0" { mutate { update => {"EVENTNO" =>"Yes" } } }
    else if [EVENTNO] =="1" { mutate { update => {"EVENTNO" =>"The machine is off" } } }
    else if [EVENTNO] =="2" { mutate { update => {"EVENTNO" =>"The machine is on" } } }

```

Uses a lot less memory, but at the ent I get errors like:

```auto
[2020-02-28T11:30:49,709][ERROR][logstash.agent] Failed to execute action {:action=>LogStash::PipelineAction::Create/pipeline_id:main, :exception=>"Java::JavaLang::StackOverflowError", :message=>"", :backtrace=>["java.lang.ClassLoader.findLoadedClass(ClassLoader.java:1038)", "java.lang.ClassLoader.loadClass(ClassLoader.java:406)", "java.lang.ClassLoader.loadClass(ClassLoader.java:357)", "usr.share.logstash.logstash_minus_core.lib.logstash.compiler.lscl.RUBY$method$javaify_sexpr$0(/usr/share/logstash/logstash-core/lib/logstash/compiler/lscl.rb:273)",
...

```

At the end, in order to be sure that the problem is memory and not another thing, I just put 10 entries (10 "mutate") and worked perfectly.  
So, my question is: What is a better way to translate those 22,000 possible EVENTNO?

---

<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [February 28, 2020, 5:29pm UTC](https://discuss.elastic.co/t/java-error-when-too-many-conditions-in-logstash/221466/2 "2020-02-28T17:29:34Z")

</div>

> [@syunusic](#):
>
> What is a better way to translate those 22,000 possible EVENTNO?

Use a [translate](https://www.elastic.co/guide/en/logstash/current/plugins-filters-translate.html) filter.

---

<div class="post-metadata">

**Author:** ![syunusic](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/syunusic/32/4131_2.png) [@syunusic](https://discuss.elastic.co/u/syunusic)\
**Post date:** [February 28, 2020, 6:04pm UTC](https://discuss.elastic.co/t/java-error-when-too-many-conditions-in-logstash/221466/3 "2020-02-28T18:04:37Z")

</div>

LOL... When I wrote the word "translate" I thought.. "there is my answer"... but I was at the end of my post.. Thanks @Badger!

---

<div class="post-metadata">

**Author:** ![syunusic](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/syunusic/32/4131_2.png) [@syunusic](https://discuss.elastic.co/u/syunusic)\
**Post date:** [February 29, 2020, 3:25pm UTC](https://discuss.elastic.co/t/java-error-when-too-many-conditions-in-logstash/221466/4 "2020-02-29T15:25:35Z")

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That was it. I used translate filter and that did the charm.  
Fast and not much memory used.  
Thanks!

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 28, 2020, 3:25pm UTC](https://discuss.elastic.co/t/java-error-when-too-many-conditions-in-logstash/221466/5 "2020-03-28T15:25:37Z")

</div>

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