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https://issues.apache.org/jira/browse/CASSANDRA-15519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17692268#comment-17692268
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Paul Ayers commented on CASSANDRA-15519:
----------------------------------------

We've been trying to use the following to see what the current request sizes 
are:
org.apache.cassandra.metrics:type=Client,name=RequestsSize
org.apache.cassandra.metrics:type=Client,name=RequestsSizeByIpDistribution

But, these always come up zero even when under load, is there a better way?

> Make native_transport_max_concurrent_requests_in_bytes(_per_ip) changeable at 
> runtime
> -------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-15519
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15519
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local/Config, Messaging/Client
>            Reporter: Jordan West
>            Assignee: Jordan West
>            Priority: Normal
>              Labels: pull-request-available
>             Fix For: 4.0-alpha4, 4.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> CASSANDRA-15013 added configurable global and per endpoint limits on the 
> number of in flight requests, measured in bytes. During times when the 
> cluster is overloaded, it can be useful to change this setting without having 
> to restart the Cassandra process. Changing the limits should affect all 
> existing and new connections.



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