# Impact on replacing Oracle JDK with openJDK

**URL:** <https://discuss.elastic.co/t/impact-on-replacing-oracle-jdk-with-openjdk/173883>\
**Category:** Elasticsearch\
**Created:** [March 26, 2019, 8:31am UTC](https://discuss.elastic.co/t/impact-on-replacing-oracle-jdk-with-openjdk/173883 "2019-03-26T08:31:38Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Amol\_Gaitonde](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/amol_gaitonde/32/20893_2.png) [@Amol\_Gaitonde](https://discuss.elastic.co/u/Amol_Gaitonde)\
**Post date:** [March 26, 2019, 8:31am UTC](https://discuss.elastic.co/t/impact-on-replacing-oracle-jdk-with-openjdk/173883/1 "2019-03-26T08:31:38Z")

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We have moved to openJDK 8 on version 6.2.4 and since then we are noticing issues such as below.

1. UNASSIGNED INDEX\_CREATED
2. Frequentlty Kibana having intermittent no living connection error messages and status becomes Red

Has anyone experienced it or did any tuning post using OpenJDK?

Thanks  
Amol

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [March 26, 2019, 1:56pm UTC](https://discuss.elastic.co/t/impact-on-replacing-oracle-jdk-with-openjdk/173883/2 "2019-03-26T13:56:25Z")

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No, this is unexpected. But your description is very vague so it's impossible to know what the problem is. Can you describe it in more detail? Can you share logs or other error messages? Which version of OpenJDK 8 are you using? If shards are unassigned then can you use the [allocation explain API](https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-allocation-explain.html) to find out why?

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<div class="post-metadata">

**Author:** ![Amol\_Gaitonde](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/amol_gaitonde/32/20893_2.png) [@Amol\_Gaitonde](https://discuss.elastic.co/u/Amol_Gaitonde)\
**Post date:** [March 29, 2019, 2:56am UTC](https://discuss.elastic.co/t/impact-on-replacing-oracle-jdk-with-openjdk/173883/3 "2019-03-29T02:56:05Z")

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Thank you.  
Below are the details  
openjdk version "1.8.0\_181"  
OpenJDK Runtime Environment (build 1.8.0\_181-b13)  
OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)

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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:** [April 26, 2019, 2:56am UTC](https://discuss.elastic.co/t/impact-on-replacing-oracle-jdk-with-openjdk/173883/4 "2019-04-26T02:56:07Z")

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