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Elasticsearch Error Guide In Page Navigation (click to jump) :
Troubleshooting Background – start here to get the full picture
Related Issues – selected resources on related issues
Log Context – usefull for experts
About Opster – offering a diffrent approach to troubleshoot Elasticsearch
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Troubleshooting background
To troubleshoot Elasticsearch log “Unable to close Groovy loader” it’s important to know common problems related to Elasticsearch concepts: Index, Memory. See below-detailed explanations complete with common problems, examples and useful tips.
Memory in Elasticsearch
What is it
Memory is one of the most critical resources to monitor in Elasticsearch. Elasticsearch runs on JVM and uses heap memory areas for query cache, request cache, accessing lucene segments and storing fielddata for aggregations and sorting.
Commos problems and important points
- The most common error that arises in Elasticsearch is OutOfMemory error. This error comes when the node is not able to cope up with the required heap size space. To avoid this, you need to closely monitor the heap utilization and garbage collector performance.
- As per the most up-to-date best practices you should not allocate more than 50 percent of total RAM to JVM heap size. Starting from Elasticsearch version 5.x onward this can be set using -Xms and -Xmx parameters inside jvm.options configuration file. The defaults are set to 1 GB for both minimum and maximum heap size.
- The heap size should not set more than 31 GB in any case to avoid the poor garbage collection.
Related issues to this log
To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :
1. Elasticsearch groovy script loading error – Stats : ♥ 0.37 K Ι √ 2
Log Context
Log ”Unable to close Groovy loader” classname is GroovyScriptEngineService.java
We have extracted the following from Elasticsearch source code to get an in-depth context :
Override
public Void run() {
try {
loader.close();
} catch (IOException e) {
logger.warn("Unable to close Groovy loader"; e);
}
return null;
}
});
}
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