Hey everyone,
I'm trying to migrate one of my jobs to Flink 1.4 and I'm running into a
classpath/shading error.
What happens is that when Flink calls into Cluster.connect(), somewhere
down in the stream, the cassandra library tries to initialize Netty, and
I'm getting the following exception:
Caused by: java.lang.AssertionError: Cannot locate Netty classes in the
classpath:java.lang.ClassNotFoundException:
com.datastax.shaded.netty.channel.Channel.
Full exception here:
https://gist.github.com/anonymous/16a44eabb45ad7f20d551dd29b83d2fb
I think this can be explained very easily:
1. The flink-cassandra-connector-1.4 jar contains the Datastax Cassandra
driver inside
2. The flink-cassandra-connector-1.4 jar contains a shaded (to
org.apache.flink.cassandra.shaded.io.netty) netty
3. The DataStax driver executes the following code when it initializes
netty (in NettyUtils starting line 58):
----
try {
Class.forName(String.format("%s.%s.channel.Channel", "io",
"netty"));
shaded = false;
} catch (ClassNotFoundException var9) {
try {
Class.forName("com.datastax.shaded.netty.channel.Channel");
shaded = true;
} catch (ClassNotFoundException var8) {
throw new AssertionError("Cannot locate Netty classes in
the classpath:" + var8);
}
}
----
Neither of the two packages (io.netty.channel and
com.datastax.shaded.netty.channel.Channel) are available and the shaded
one from Flink is not in the list and is never used here.
My question: Did anyone ever use the cassandra connector on 1.4. As it
looks to me it is completely broken and can never work. But maybe I'm
failing to see something. I don't include netty in my dependencies, that
could of course fix it, but I'm suspecting I will run into more
dependency problems then.
Here are my dependencies:
https://gist.github.com/anonymous/565a0ad017976502a62b2919115b31fd
What additional information can I provide?
Thanks,
Dominik
