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https://issues.apache.org/jira/browse/YARN-6628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16019646#comment-16019646
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Jason Lowe commented on YARN-6628:
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Other dependency changes associated with the move from fst-2.24 to fst-2.50
include addiing java-util-1.9.0.jar and json-io-2.5.1.jar (in addition to
jackson-core-2.23.jar) and the removal of objenesis-2.1.jar.
As for why jackson-core-2.7.8.jar is missing from
hadoop-dist/target/hadoop-3.0.0-alpha3-SNAPSHOT/share/hadoop/yarn/lib, that's
caused by HADOOP-12850. That JIRA changed the way the projects are stitched
together, and it only copies dependency jars if they aren't already somewhere
else in the tree. See dev-support/bin/dist-layout-stitching for details. The
jackson-core-2.7.8.jar is listed in
hadoop-yarn-project/target/hadoop-3.0.0-alpha3-SNAPSHOT/share/hadoop/yarn/lib,
so the fact that it's not in hadoop-dist is an artifact of how the dependencies
are copied over.
The fst dependency on jackson-core says it's needed for
createJSONConfiguration. Is it possible that we are not calling that method
and do not actually need this dependency in practice?
> Unexpected jackson-core-2.2.3 dependency introduced
> ---------------------------------------------------
>
> Key: YARN-6628
> URL: https://issues.apache.org/jira/browse/YARN-6628
> Project: Hadoop YARN
> Issue Type: Bug
> Components: timelineserver
> Affects Versions: 2.8.1
> Reporter: Jason Lowe
> Priority: Blocker
>
> The change in YARN-5894 caused jackson-core-2.2.3.jar to be added in
> share/hadoop/yarn/lib/. This added dependency seems to be incompatible with
> jackson-core-asl-1.9.13.jar which is also shipped as a dependency. This new
> jackson-core jar ends up breaking jobs that ran fine on 2.8.0.
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