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https://issues.apache.org/jira/browse/CASSANDRA-20072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17897145#comment-17897145
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Mohammad Aburadeh commented on CASSANDRA-20072:
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Hi [~smiklosovic] ,
1- We are still checking the network on the client side.
It was difficult for us to determine which client-server was causing the
issue. I had to modify Cassandra code locally to log the client IP. Now, we are
checking the network on that server.
2- We open around 10-100 connections per second, each connection stays for 1-5
seconds.
For the warning frequency, we get around 5 warnings every 1 minute.
3- We have around 20 client servers. 3 of them are responsible for loading data
into Cassandra, those servers open 10-100 connections per second. The other
servers are for user analysis.
Regards
Mohammad
> Log client address when detecting unknown exception in client networking
> -------------------------------------------------------------------------
>
> Key: CASSANDRA-20072
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20072
> Project: Cassandra
> Issue Type: Bug
> Components: Observability/Logging
> Reporter: Mohammad Aburadeh
> Assignee: Mohammad Aburadeh
> Priority: Urgent
> Fix For: 4.0.x, 4.1.x, 5.0.x, 5.x
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> We are getting hundreds of the below warnings in Cassandra logs:
> {code:java}
> WARN [epollEventLoopGroup-5-7] 2024-11-10 00:26:24,296
> ExceptionHandlers.java:139 - Unknown exception in client networking
> io.netty.channel.StacklessClosedChannelException: null
> at io.netty.channel.AbstractChannel.close(ChannelPromise)(Unknown
> Source)
> {code}
> This means the client dropped the connection abruptly or abnormally. The
> issue could be a network or application issue on the client side.
> Since there could be many client servers, Cassandra must log the client IP
> and the port so we can check what's the problem with that server.
> I'll attached the fix for this small change.
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