# MVEL infinite loop causing cluster performance degradation

**URL:** <https://discuss.elastic.co/t/mvel-infinite-loop-causing-cluster-performance-degradation/12385>\
**Category:** Elasticsearch\
**Created:** [June 12, 2013, 3:45pm UTC](https://discuss.elastic.co/t/mvel-infinite-loop-causing-cluster-performance-degradation/12385 "2013-06-12T15:45:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Nick\_Zadrozny](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nick_zadrozny/32/1150_2.png) [@Nick\_Zadrozny](https://discuss.elastic.co/u/Nick_Zadrozny)\
**Post date:** [June 12, 2013, 3:45pm UTC](https://discuss.elastic.co/t/mvel-infinite-loop-causing-cluster-performance-degradation/12385/1 "2013-06-12T15:45:03Z")

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Hi all,

I wonder if anyone else has seen an error similar to this:

> <https://github.com/elastic/elasticsearch/issues/3168>

Basically, MVEL gets into an infinite loop in its CompileException.java,  
presumably when trying to report an error. This causes the affected node to  
hang completely, which in turn causes a pretty serious performance  
degradation in the cluster, manifested as cascading timed out requests  
until the affected node is restarted.

I've already shared some logs with Shay, and I'm still working to identify  
a request that can consistently duplicate this issue. But in the mean time  
I thought I'd also mention it here to see if anyone else has seen a similar  
error and might be able to share their observations.

--  
Nick Zadrozny

[http://websolr.com](http://websolr.com) • [http://bonsai.io](http://bonsai.io)  
Hosted full-text search, with Solr and Elasticsearch.

Let's talk in real time: [http://meetme.so/nz](http://meetme.so/nz)

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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:** [July 6, 2017, 2:31am UTC](https://discuss.elastic.co/t/mvel-infinite-loop-causing-cluster-performance-degradation/12385/2 "2017-07-06T02:31:32Z")

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