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https://issues.apache.org/jira/browse/CASSANDRA-16581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17344902#comment-17344902
 ] 

David Capwell commented on CASSANDRA-16581:
-------------------------------------------

tests are passing, but seems our SSL tests are failing as the "unknown" log 
added is showing the following

{code}
Caused by: javax.net.ssl.SSLHandshakeException: error:100000f7:SSL 
routines:OPENSSL_internal:WRONG_VERSION_NUMBER
        at 
io.netty.handler.ssl.ReferenceCountedOpenSslEngine.sslReadErrorResult(ReferenceCountedOpenSslEngine.java:1309)
        at 
io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap(ReferenceCountedOpenSslEngine.java:1270)
        at 
io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap(ReferenceCountedOpenSslEngine.java:1346)
        at 
io.netty.handler.ssl.ReferenceCountedOpenSslEngine.unwrap(ReferenceCountedOpenSslEngine.java:1389)
        at 
io.netty.handler.ssl.SslHandler$SslEngineType$1.unwrap(SslHandler.java:206)
        at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1387)
        at 
io.netty.handler.ssl.SslHandler.decodeNonJdkCompatible(SslHandler.java:1294)
        at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1331)
        at 
io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:508)
        at 
io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:447)
        ... 15 common frames omitted]
{code}

> Failure to execute queries should emit a KPI other than read 
> timeout/unavailable so it can be alerted/tracked
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-16581
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16581
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Messaging/Client, Observability/Metrics
>            Reporter: David Capwell
>            Assignee: David Capwell
>            Priority: Normal
>             Fix For: 3.0.x, 3.11.x, 4.0-rc
>
>
> When we are unable to parse a message we do not have a way to detect this 
> from a monitoring point of view so can get into situations where we believe 
> the database is fine but the clients are on-fire.  This case popped up in the 
> 2.1 to 3.0 upgrade as paging state wasn’t mixed-mode safe.



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