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https://issues.apache.org/jira/browse/CASSANDRA-20202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17913010#comment-17913010
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Dmitry Konstantinov commented on CASSANDRA-20202:
-------------------------------------------------

Hi [~samt], thank you for highlighting the issue, I am trying to reproduce it 
locally and understand the root cause better.

> Test failure: org.apache.cassandra.transport.SimpleClientPerfTest
> -----------------------------------------------------------------
>
>                 Key: CASSANDRA-20202
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-20202
>             Project: Apache Cassandra
>          Issue Type: Bug
>          Components: Messaging/Client, Test/burn
>            Reporter: Sam Tunnicliffe
>            Assignee: Sam Tunnicliffe
>            Priority: Normal
>             Fix For: 4.1.x
>
>
> SimpleClient uses a CQLMessageHandler instance to deal with response messages 
> in the V5 framing format. It looks like CASSANDRA-16663 broke SimpleClient's 
> ability to return capacity allocated during the processing of inbound 
> messages (i.e. responses from server->client) back to the global and 
> per-endpoint resource monitors. The change in behaviour introduced in 
> CASSANDRA-20052, in which we now push back to the client when a capacity for 
> a large message can't be allocated, causes SimpleClientPerfTest in the burn 
> suite to fail on V5/V6. This is purely because the test expects the client to 
> run for a fixed period without interruption, but now it halts as soon as 
> capacity is exhausted. The simple fix is to restore SimpleClient's capacity 
> return.



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