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From "Dominik Bruhn (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4091) flink-connector-cassandra has conflicting guava version
Date Sat, 18 Jun 2016 10:51:05 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15337750#comment-15337750

Dominik Bruhn commented on FLINK-4091:

Here is the stdout of the run command:

And here is the log:

Could it be related to how I package the job? Currently I'm integrating the flink-connector-cassandra
into my fat job jar. I didn't find any documentation if that is the right approach.

> flink-connector-cassandra has conflicting guava version
> -------------------------------------------------------
>                 Key: FLINK-4091
>                 URL: https://issues.apache.org/jira/browse/FLINK-4091
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming Connectors
>    Affects Versions: 1.1.0
>         Environment: MacOSX, 1.10-SNAPSHOT (head is 1a6bab3ef76805685044cf4521e32315169f9033)
>            Reporter: Dominik Bruhn
> The newly merged cassandra streaming connector has an issue with its guava dependency.
> The build-process for flink-connector-cassandra creates shaded JAR file which contains
the connector, the datastax cassandra driver plus in org.apache.flink.shaded a shaded copy
of guava. 
> The datastax cassandra driver calls into Futures.withFallback ([1]) which is present
in this guava version. This also works inside the flink-connector-cassandra jar.
> Now the actual build-process for Flink happens and builds another shaded JAR and creates
the flink-dist.jar. Inside this JAR, there is also a shaded version of guava inside org.apache.flink.shaded.
> Now the issue: The guava version which is in the flink-dist.jar is not compatible and
doesn't contain the Futures.withFallback which the datastax driver is using.
> This leads into the following issue: You can without any problems launch a flink task
which uses the casandra driver locally (so through the mini-cluster) because that is never
using the flink-dist.jar. 
> BUT: As soon as you are trying to start this job on a flink cluster (which uses the flink-dist.jar),
the job breaks with the following exception:
> https://gist.github.com/theomega/5ab9b14ffb516b15814de28e499b040d
> You can inspect this by opening the flink-connector-cassandra_2.11-1.1-SNAPSHOT.jar and
the flink-dist_2.11-1.1-SNAPSHOT.jar in a java decompiler.
> I don't know a good solution here: Perhaps it would be one solution to shade the guava
for the cassandra-driver somewhere else than at org.apache.flink.shaded.
> [1]: https://google.github.io/guava/releases/19.0/api/docs/com/google/common/util/concurrent/Futures.html#withFallback(com.google.common.util.concurrent.ListenableFuture,
com.google.common.util.concurrent.FutureFallback, java.util.concurrent.Executor)

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