# Question about Rolling Upgrade

**URL:** <https://discuss.elastic.co/t/question-about-rolling-upgrade/160253>\
**Category:** Elasticsearch\
**Created:** [December 10, 2018, 10:13pm UTC](https://discuss.elastic.co/t/question-about-rolling-upgrade/160253 "2018-12-10T22:13:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![samwzm](https://avatars.discourse-cdn.com/v4/letter/s/ac91a4/32.png) [@samwzm](https://discuss.elastic.co/u/samwzm)\
**Post date:** [December 10, 2018, 10:13pm UTC](https://discuss.elastic.co/t/question-about-rolling-upgrade/160253/1 "2018-12-10T22:13:14Z")

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Hi, there,

We have a ES cluster with version 6.3.2. We have three separate Master nodes and two hot data nodes. We want to roll upgrade to latest version 6.5.1. We followed below instruction:

[https://www.elastic.co/guide/en/elasticsearch/reference/current/rolling-upgrades.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/rolling-upgrades.html)

The purpose of rolling upgrade is to keep the ES up and running during the upgrade time. Here is what I did and the problem I got:

First, I brought down master node one by one. Whenever I brought down one master node, I will check the kibana and the data ingestion work, both are fine when I did the rolling upgrade master nodes.

Second, when I brought down the first hot data node, I can't access Kibana, it complains internal errors. Four minutes later, after I finished hot data node upgrades, immediately I can access Kibana.

Third, I brought down second hot data node, and this time both the kibana and data ingestion work fine.

However, after I finished the rolling upgrade, I checked the index that keeps running for the whole time of the upgrade, I found there is a gap on all the charts. the time matches with the first hot data node down time. So now I am not sure if the rolling upgrade can keep the index ingestion.

Please advise.

Thanks!

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 7, 2019, 10:13pm UTC](https://discuss.elastic.co/t/question-about-rolling-upgrade/160253/2 "2019-01-07T22:13:17Z")

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