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https://issues.apache.org/jira/browse/CASSANDRA-13649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16200616#comment-16200616
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Varun Gupta commented on CASSANDRA-13649:
-----------------------------------------

[~norman] I rolled out this patch to one of our production cluster, I still 
sys.read exception in the logs.

INFO  [epollEventLoopGroup-11-9] 2017-10-11 17:01:10,074 Message.java:641 - 
Unexpected exception during request; channel = [id: 0x72599f85, L:/X.X.X.X:XXXX 
- R:/X.X.X.X:XXXX]
io.netty.channel.unix.Errors$NativeIoException: syscall:read(...)() failed: 
Connection reset by peer

> Uncaught exceptions in Netty pipeline
> -------------------------------------
>
>                 Key: CASSANDRA-13649
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13649
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Streaming and Messaging, Testing
>            Reporter: Stefan Podkowinski
>            Assignee: Norman Maurer
>              Labels: patch
>             Fix For: 2.2.11, 3.0.15, 3.11.1, 4.0
>
>         Attachments: 
> 0001-CASSANDRA-13649-Ensure-all-exceptions-are-correctly-.patch, 
> test_stdout.txt
>
>
> I've noticed some netty related errors in trunk in [some of the dtest 
> results|https://builds.apache.org/view/A-D/view/Cassandra/job/Cassandra-devbranch-dtest/106/#showFailuresLink].
>  Just want to make sure that we don't have to change anything related to the 
> exception handling in our pipeline and that this isn't a netty issue. 
> Actually if this causes flakiness but is otherwise harmless, we should do 
> something about it, even if it's just on the dtest side.
> {noformat}
> WARN  [epollEventLoopGroup-2-9] 2017-06-28 17:23:49,699 Slf4JLogger.java:151 
> - An exceptionCaught() event was fired, and it reached at the tail of the 
> pipeline. It usually means the last handler in the pipeline did not handle 
> the exception.
> io.netty.channel.unix.Errors$NativeIoException: syscall:read(...)() failed: 
> Connection reset by peer
>       at io.netty.channel.unix.FileDescriptor.readAddress(...)(Unknown 
> Source) ~[netty-all-4.0.44.Final.jar:4.0.44.Final]
> {noformat}
> And again in another test:
> {noformat}
> WARN  [epollEventLoopGroup-2-8] 2017-06-29 02:27:31,300 Slf4JLogger.java:151 
> - An exceptionCaught() event was fired, and it reached at the tail of the 
> pipeline. It usually means the last handler in the pipeline did not handle 
> the exception.
> io.netty.channel.unix.Errors$NativeIoException: syscall:read(...)() failed: 
> Connection reset by peer
>       at io.netty.channel.unix.FileDescriptor.readAddress(...)(Unknown 
> Source) ~[netty-all-4.0.44.Final.jar:4.0.44.Final]
> {noformat}
> Edit:
> The {{io.netty.channel.unix.Errors$NativeIoException: syscall:read(...)() 
> failed}} error also causes tests to fail for 3.0 and 3.11. 



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