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https://issues.apache.org/jira/browse/CASSANDRA-17252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17472985#comment-17472985
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Caleb Rackliffe commented on CASSANDRA-17252:
---------------------------------------------

+1 on both PRs, although the 3.0 PR seems to have {{trunk}} as its base.

Also, I'm not sure WTH is going on w/ the CircleCi runs: 
https://app.circleci.com/pipelines/github/jonmeredith/cassandra/545/workflows/c06ad8f5-5a4d-42fe-a126-a3da09ca8149/jobs/2553

> ConnectionLimitHandler may leaks connection count if remote connection drops
> ----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-17252
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-17252
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Messaging/Client
>            Reporter: Jon Meredith
>            Assignee: Jon Meredith
>            Priority: Normal
>             Fix For: 3.0.x, 3.11.x, 4.0.x, 4.x
>
>
> In some cases, Netty does not return the original IP used for per-IP counting 
> when the channel becomes inactive,
> which throws an NPE before decrementing the active per-IP count.
> {code:java}
> java.lang.NullPointerException
> at 
> org.apache.cassandra.transport.ConnectionLimitHandler.channelInactive(ConnectionLimitHandler.java:101)
>        at 
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:262)
>        at 
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:248)
>        at 
> io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:241)
>        at 
> io.netty.handler.codec.ByteToMessageDecoder.channelInputClosed(ByteToMessageDecoder.java:389)
>        at 
> io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:354)
>        at 
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:262)
>        at 
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:248)
>        at 
> io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:241)
>        at 
> io.netty.channel.DefaultChannelPipeline$HeadContext.channelInactive(DefaultChannelPipeline.java:1405)
>        at 
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:262)
>        at 
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:248)
>        at 
> io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:901)
>        at 
> io.netty.channel.AbstractChannel$AbstractUnsafe$8.run(AbstractChannel.java:819)
>        at 
> io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
>        at 
> io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
>        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:497)
>        at 
> io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
>        at 
> io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
>        at 
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
>        at java.base/java.lang.Thread.run(Thread.java:834)
> {code}



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