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https://issues.apache.org/jira/browse/HADOOP-6800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12882831#action_12882831
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Hemanth Yamijala commented on HADOOP-6800:
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One more point is that some of the subprojects in mapred seem to be using
hadoop-common-*-SNAPSHOT as the dependency and som hadoop-common-*-dev-SNAPSHOT
as the dependency. However, this does not seem to be a problem as far as the
libraries in the packages are concerned.
> Harmonize JAR library versions
> ------------------------------
>
> Key: HADOOP-6800
> URL: https://issues.apache.org/jira/browse/HADOOP-6800
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Tom White
> Assignee: Tom White
> Priority: Blocker
> Fix For: 0.21.0
>
> Attachments: HADOOP-6800.patch, HADOOP-6800.patch, HADOOP-6800.patch,
> ivy-declarations.dump.merged, jars-in-lib.dump.merged
>
>
> Currently, multiple versions of the same library JAR are being pulled in for
> various reasons.
> * Within the same project, multiple versions of the same JAR are pulled in.
> E.g. Avro (used by Common) depends on Commons Lang 2.5 while Common depends
> on Commons Lang 2.4.
> * Dependent subprojects use different versions. E.g. Common depends on Avro
> 1.3.2 while MapReduce depends on 1.3.0. Since MapReduce depends on Common,
> this has the potential to cause a problem at runtime.
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