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Date: Mon, 20 Jun 2016 09:56:05 +0000 (UTC)
From: "ASF GitHub Bot (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (FLINK-4091) flink-connector-cassandra has
 conflicting guava version
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archived-at: Mon, 20 Jun 2016 09:56:07 -0000


    [ https://issues.apache.org/jira/browse/FLINK-4091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15339263#comment-15339263 ] 

ASF GitHub Bot commented on FLINK-4091:
---------------------------------------

Github user zentol commented on the issue:

    https://github.com/apache/flink/pull/2133
  
    *now


> 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
>            Assignee: Chesnay Schepler
>
> 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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