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From "Praveen Peddi (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-10055) High CPU load for Cassandra 2.1.8
Date Thu, 07 Jan 2016 21:34:40 GMT


Praveen Peddi commented on CASSANDRA-10055:

Hi Vijay,
Can you elaborate on the changes you did with coreConnPerHostLocal and maxConnPerHostLocal
that helped with CPU load? We are in the process of migrating from 2.0.9 to 2.1.11 and with
2.0.9 we are seeing around 5 to 15% CPu and with 2.1.11 we are seeing 25 to 40% CPU for the
same exact load test. Latencies with 2.1.11 are also 2 to 3 times higher. 

What values did you before and after? Were your latencies also improve after you made those
config changes?

> High CPU load for Cassandra 2.1.8
> ---------------------------------
>                 Key: CASSANDRA-10055
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Configuration
>         Environment: Prod
>            Reporter: vijay
>              Labels: triaged
>         Attachments: dstst-lcdn.log, dstst-lcdn2.log, dstst-lcdn3.log, dstst-lcdn4.log,
dstst-lcdn5.log, dstst-lcdn6.log, js.log, js2.log, js3.log, js4.log, js5.log, js6.log, top-bHn1-2.log,
top-bHn1-3.log, top-bHn1-4.log, top-bHn1-5.log, top-bHn1-6.log, top-bHn1.log
> We are seeing High CPU Load about 80% to 100% in Cassandra 2.1.8 when doing Data ingest,
we did not had this issue in 2.0.x version of Cassandra
> we tested this in different Cloud platforms and results are same.
> CPU: Tested with M3 2xlarge AWS instances
> Ingest rate: Injecting 1 million Inserts each insert is of 1000bytes
> no other Operations are happening except inserts in Cassandra
> let me know if more info is needed.

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