Vivekanand Koya created CASSANDRA-20984:
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Summary: java.lang.ClassCastException: Issues while joining
Key: CASSANDRA-20984
URL: https://issues.apache.org/jira/browse/CASSANDRA-20984
Project: Apache Cassandra
Issue Type: Bug
Components: Consistency/Bootstrap and Decommission,
Consistency/Streaming
Reporter: Vivekanand Koya
>From [~rustyrazorblade]'s recommendation
I've taken a closer look at the code. I've been able to reproduce the issue and
have produced a fix. Along the way, I've noticed a few things.
# initiateStreaming() method of OutboundConnectionInitiator is called from
NettyStreamingConnectionFactory located in the streaming.async package. Similar
method invocation initiateMessaging() method of OutboundConnectionInitiator is
made from OutboundConnection (net package). Thus, the enum Outcome is
package-private. The sanity check based on
OutboundConnectionInitiator.Result.Outcome could be performed from
OutboundConnection class. The same check cannot be performed from
NettyStreamingConnectionFactory since the outcome field of Result is
inaccessible.
# There is an attempt to cast to the generic type SuccessType in
OutboundConnectionIntiator.Result class. This behavior is inconsistent with the
retry() and incompatible() methods which return their respective classes.
# In NettyStreamingConnectionFactory, there appears to be some confusion in
the involcation of isSuccess() method. It actually is making the invocation on
Netty Future. It should have been on the Result object. On making a successful
connect, NettyStreamingConnectionFactory calls success() on Future' s getNow()
without checking the type of the cast.
# There are no tests for initiateStreaming() method of
OutboundConnectionInitiator as there are for initiateMessaging() method of
OutboundConnectionInitiator.
What I've done. # I wrote a test (StreamingTest) that reproduces the issue in
[https://lists.apache.org/thread/ykkwhjdpgyqzw5xtol4v5ysz664bxxl3].
# I used the instanceof in [https://openjdk.org/jeps/394] to make incorrect
comparisons a compile-time error. This is done in OutboundConnection where I
check if result.success() instanceof MessagingSuccess and
OutboundConnectionInitiator where I return Success safely instead.
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