# Upgrading to 6.3+ with Persistent Queues Enabled

**URL:** https://discuss.elastic.co/t/upgrading-to-6-3-with-persistent-queues-enabled/136386
**Category:** Logstash
**Created:** [June 18, 2018, 10:26pm UTC](https://discuss.elastic.co/t/upgrading-to-6-3-with-persistent-queues-enabled/136386 "2018-06-18T22:26:38Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![yaauie](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yaauie/32/23363_2.png) [@yaauie](https://discuss.elastic.co/u/yaauie)
#### Post date: [June 18, 2018, 10:26pm UTC](https://discuss.elastic.co/t/upgrading-to-6-3-with-persistent-queues-enabled/136386/1 "2018-06-18T22:26:38Z")

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Logstash 6.3.0 has landed, and with it comes some useful improvements to the Persistent Queue, an opt-in feature that enables disk-based spooling and resiliency across abnormal shutdowns.

If you're using the Persistent Queue, you'll want to pay some special attention to the [Upgrade Notes](https://www.elastic.co/guide/en/logstash/6.3/upgrading-logstash.html): while we make every attempt to make upgrades as hands-off as possible, this upgrade is going to require a little hands-on involvement. We wanted to also start a thread here in the community forums to make sure our users were well-informed.

Unfortunately, PQ serialization issues were found in Logstash 6.2.x (affecting the PQ in all previous releases) that could not be resolved in a fully backward-compatible way, and some queue elements that were spooled to disk using a Logstash 6.2.x or earlier cannot be processed on versions of Logstash that include the fix.

We are recommending that users who have enabled the Persistent Queue [drain your queues](https://www.elastic.co/guide/en/logstash/current/upgrading-logstash-pqs.html#_drain_the_persistent_queue) prior to upgrading.

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### Author: ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [June 18, 2018, 10:39pm UTC](https://discuss.elastic.co/t/upgrading-to-6-3-with-persistent-queues-enabled/136386/2 "2018-06-18T22:39:12Z")

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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 16, 2018, 10:47pm UTC](https://discuss.elastic.co/t/upgrading-to-6-3-with-persistent-queues-enabled/136386/3 "2018-07-16T22:47:37Z")

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