# Cassandra - 100% CPU usage

**URL:** <https://discuss.konghq.com/t/cassandra-100-cpu-usage/4884>\
**Category:** Questions\
**Created:** [November 12, 2019, 9:40am UTC](https://discuss.konghq.com/t/cassandra-100-cpu-usage/4884 "2019-11-12T09:40:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![milaw](https://avatars.discourse-cdn.com/v4/letter/m/a88e57/32.png) [@milaw](https://discuss.konghq.com/u/milaw)\
**Post date:** [November 12, 2019, 9:40am UTC](https://discuss.konghq.com/t/cassandra-100-cpu-usage/4884/1 "2019-11-12T09:40:00Z")

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Kong 0.15  
Cassandra 3.11

For an undefined reason, on almost any request (with authentication plugin enable - oauth2/key-auth) Cassandra CPU usage grow to 100%  
Any recommendations/tools about debugging Cassandra?  
I didn’t find in logs any info related to this behavior.

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**Author:** ![sundew\_me](https://yyz2.discourse-cdn.com/flex036/user_avatar/discuss.konghq.com/sundew_me/32/1486_2.png) [@sundew\_me](https://discuss.konghq.com/u/sundew_me)\
**Post date:** [November 12, 2019, 5:40pm UTC](https://discuss.konghq.com/t/cassandra-100-cpu-usage/4884/2 "2019-11-12T17:40:48Z")

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Check gc.log . Sounds like a mistuned jvm.

$ grep start gc.log.0.current | tail

Start I guess will be keyword

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<div class="post-metadata">

**Author:** ![milaw](https://avatars.discourse-cdn.com/v4/letter/m/a88e57/32.png) [@milaw](https://discuss.konghq.com/u/milaw)\
**Post date:** [November 19, 2019, 12:53pm UTC](https://discuss.konghq.com/t/cassandra-100-cpu-usage/4884/3 "2019-11-19T12:53:01Z")

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We found that enabling authentication between kong and Cassandra (CQL username/password) it one of the main cause of this behaviour