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From "Petr Novotnik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6285) resolve hadoop-compatibility confusion
Date Mon, 10 Apr 2017 06:23:41 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15962482#comment-15962482

Petr Novotnik commented on FLINK-6285:

For quick reference: some short discussion on this issue has happened on this [user's mailing
list thread|http://mail-archives.apache.org/mod_mbox/flink-user/201704.mbox/browser]

> resolve hadoop-compatibility confusion
> --------------------------------------
>                 Key: FLINK-6285
>                 URL: https://issues.apache.org/jira/browse/FLINK-6285
>             Project: Flink
>          Issue Type: Bug
>    Affects Versions: 1.2.0
>            Reporter: Petr Novotnik
> As of Flink 1.2.0, the binary distribution does not include classes from the {{hadoop-compatibility}}
dependency anymore.
> {noformat}
> flink-1.2.0> for i in lib/*.jar; jar tf $i | grep WritableTypeInfo; end
> flink-1.2.0 [1]> # the above finds nothing
> {noformat}
> Therefore, it is necessary to copy the compatibility jar to flink's installation `lib/`
directory (or a sub-directory) if one wishes to use hadoop input formats. Merely packaging
the compatibility jar as part of an application's "fat jar" does not suffice, as code in [TypeExtractor#createHadoopWritableTypeInfo|https://github.com/apache/flink/blob/master/flink-core/src/main/java/org/apache/flink/api/java/typeutils/TypeExtractor.java#L1988]'s
relies on being able to see the compatibility classes through the classloader {{TypeExtractor}}
itself was loaded by. On yarn this seems not to be the case (e.g. when running the application
through {{flink run -m yarn-cluster ...}}).
> Ideally, we'd fix the class loading issue, such that flink's installation does not need
to be altered, due to the need of a particular application. Alternatively, we could include
the hadoop-compatibility jar as part of the binary distribution and provide corresponding
instructions, [1|https://ci.apache.org/projects/flink/flink-docs-release-1.2/dev/batch/hadoop_compatibility.html]
and [2|https://ci.apache.org/projects/flink/flink-docs-release-1.2/dev/migration.html] seem
to be good places.

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