# Heap Errors After Upgrade 6.3.1 **URL:** \ **Category:** Elasticsearch\ **Created:** [July 24, 2018, 3:46am UTC](https://discuss.elastic.co/t/heap-errors-after-upgrade-6-3-1/141284 "2018-07-24T03:46:00Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![AlphaJosh](https://avatars.discourse-cdn.com/v4/letter/a/5f8ce5/32.png) [@AlphaJosh](https://discuss.elastic.co/u/AlphaJosh)\ **Post date:** [July 24, 2018, 3:46am UTC](https://discuss.elastic.co/t/heap-errors-after-upgrade-6-3-1/141284/1 "2018-07-24T03:46:00Z")
3 nodes (includes one master node), 8Gb memory, 4Gb Heap size. Worked fine after 5.6.8 but then after upgrading to 6.3.1 we get a java heap error on the master as it gets to 90% (5hrs later) and then the elasticsearch service crashes. I wonder if there could be an issue with the index, I saw an error in the index migration. I am unsure on how to troubleshoot this. Anyone seen anything like that? ---
**Author:** ![AlphaJosh](https://avatars.discourse-cdn.com/v4/letter/a/5f8ce5/32.png) [@AlphaJosh](https://discuss.elastic.co/u/AlphaJosh)\ **Post date:** [July 25, 2018, 3:49am UTC](https://discuss.elastic.co/t/heap-errors-after-upgrade-6-3-1/141284/2 "2018-07-25T03:49:22Z")
I ended up removing the data and now it starts up fine ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [August 22, 2018, 3:49am UTC](https://discuss.elastic.co/t/heap-errors-after-upgrade-6-3-1/141284/3 "2018-08-22T03:49:48Z")
Closed on August 22, 2018, 3:49am UTC This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.