# Logstash throws error INVALID\_FETCH\_SESSION\_EPOCH after upgrading from 6.5 to 6.8.8

**URL:** <https://discuss.elastic.co/t/logstash-throws-error-invalid-fetch-session-epoch-after-upgrading-from-6-5-to-6-8-8/236482>\
**Category:** Logstash\
**Created:** [June 10, 2020, 10:07am UTC](https://discuss.elastic.co/t/logstash-throws-error-invalid-fetch-session-epoch-after-upgrading-from-6-5-to-6-8-8/236482 "2020-06-10T10:07:49Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![vijay\_kaali](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vijay_kaali/32/59998_2.png) [@vijay\_kaali](https://discuss.elastic.co/u/vijay_kaali)\
**Post date:** [June 10, 2020, 10:07am UTC](https://discuss.elastic.co/t/logstash-throws-error-invalid-fetch-session-epoch-after-upgrading-from-6-5-to-6-8-8/236482/1 "2020-06-10T10:07:49Z")

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We get [org.apache.kafka.clients.FetchSessionHandler] [Consumer clientId=logstash-0, groupId=logstash] Node 0 was unable to process the fetch request with (sessionId=1844422694, epoch=11343): INVALID\_FETCH\_SESSION\_EPOCH

We have upgraded our elastic cluster from 6.5 to 6.8.8 . logstash gets its feed from kafka 2.12 which is same . but i see the above errors after upgrade of elk cluster

thing is i have upgrade test enviroment from 6.5 \> 6. 8 \> 7.x but it did not throw any errors .

any help on this

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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 8, 2020, 10:07am UTC](https://discuss.elastic.co/t/logstash-throws-error-invalid-fetch-session-epoch-after-upgrading-from-6-5-to-6-8-8/236482/2 "2020-07-08T10:07:52Z")

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