# Disabling TieredCompilation leads to timeout

**URL:** <https://discuss.elastic.co/t/disabling-tieredcompilation-leads-to-timeout/128664>\
**Category:** Elasticsearch\
**Created:** [April 19, 2018, 9:37am UTC](https://discuss.elastic.co/t/disabling-tieredcompilation-leads-to-timeout/128664 "2018-04-19T09:37:21Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Retenodus](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/retenodus/32/28063_2.png) [@Retenodus](https://discuss.elastic.co/u/Retenodus)\
**Post date:** [April 19, 2018, 9:37am UTC](https://discuss.elastic.co/t/disabling-tieredcompilation-leads-to-timeout/128664/1 "2018-04-19T09:37:21Z")

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Hello,

I actually hesitate to create an issue on github but I think I found an issue which can impact several deployments.

TLDR : Disabling TieredCompilation on Elasticsearch 5.5 to 6.1 can lead to:

- Increased time for stats query (correlated with the number of shards or the number of indices)
- Timeouts on DateHistogramAggregation when time\_zone is enabled
- Timeouts with xpack monitoring
- After sometime (between 10h and 1 day)

Two articles from Elastic more or less explain than disabling TieredCompilation is not detrimental:  
[https://www.elastic.co/blog/memory-issues-well-remember](https://www.elastic.co/blog/memory-issues-well-remember), [https://www.elastic.co/blog/honey-you-have-changed-quite-a-bit](https://www.elastic.co/blog/honey-you-have-changed-quite-a-bit)

Recently, I setup/upgraded elasticsearch clusters (6.1, 5.6) with TieredCompilation disabled (XX:-TieredCompilation in jvm.options) and noticed the following symptoms:

- A stats query could last multiple seconds, even almost 2 minutes
- I had a lot of timeouts with marvel/xpack monitoring
- DateHistogramAggregation were awfully long and lead to timeout when time\_zone was used (default in Kibana) - it worked without time\_zone
- All these issues disappeared for ~1 day after a cluster restart and reappeared after (I suspect it's related to index creation but not sure)

My first suspect was to say it was a 6.X issue. When I got the same thing with the upgrade of another cluster from 5.5.2 to 5.6.8, I thought it was a shard issue (I had 8000 shards on my 5.6 cluster, wheras the rule of \< 25\*GB\_HEAP should have restrain me at ~2000). When I decreased the number of shards to 1400, and them 1000, and the issue was still there, I thought it was something which appeared in 5.6).

But the stats query time decreased from 1m40s to 10s with the decrease of shards (but was still too long)

When I setup a new cluster in 5.5 and still got the issue (and not on a cluster in 5.2 setup 1 year ago), I noticed the main difference was the disabling of TieredCompilation and enabling it back (removing XX:-TieredCompilation) fixed all the issues, in 5.5 and 6.1 (I don't have anymore the 5.6 cluster, I reindexed everything in a new 5.5.2).

I wonder if the TieredCompilation disabling would be related to the issues with Joda:

- [https://github.com/elastic/elasticsearch/issues/28727](https://github.com/elastic/elasticsearch/issues/28727)
- [https://github.com/elastic/kibana/issues/15732](https://github.com/elastic/kibana/issues/15732)
- [https://github.com/elastic/kibana/issues/16951](https://github.com/elastic/kibana/issues/16951)

Regards,  
Grégoire

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**Author:** ![AndreCimander](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/andrecimander/32/30386_2.png) [@AndreCimander](https://discuss.elastic.co/u/AndreCimander)\
**Post date:** [April 24, 2018, 8:48am UTC](https://discuss.elastic.co/t/disabling-tieredcompilation-leads-to-timeout/128664/2 "2018-04-24T08:48:57Z")

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Bump, we are also interested in this.

The last time I experimented with disabling TieredCompilation within our 26-node cluster I also had catastrophic results with x-pack and timeouts.

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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:** [May 22, 2018, 8:49am UTC](https://discuss.elastic.co/t/disabling-tieredcompilation-leads-to-timeout/128664/3 "2018-05-22T08:49:01Z")

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Closed on May 22, 2018, 8:49am UTC

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