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https://issues.apache.org/jira/browse/SQOOP-3397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16657555#comment-16657555
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Devin G. Bost commented on SQOOP-3397:
--------------------------------------
Turns out that the solution was simpler than I expected. Just ensure that both
Java versions are installed on the machine (e.g. install Java 7 via: sudo yum
install java-1.7.0 java-1.7.0-openjdk-devel -y ) and then put:
{{ export JAVA_HOME=/usr/lib/jvm/java-1.7.0}}
into:
{{ /usr/lib/sqoop/conf/sqoop-env.sh}}
and ensure that your defaults are set back to Java 8 for everything else, like:
{{NR_OF_JRE_OPTIONS=$(echo 0 | alternatives --config java 2>/dev/null | grep
'There ' | awk '\{print $3}' | tail -1)}}
{{NR_OF_SDK_OPTIONS=$(echo 0 | alternatives --config javac 2>/dev/null | grep
'There ' | awk '\{print $3}' | tail -1)}}{{echo $(($NR_OF_SDK_OPTIONS - 1)) |
sudo alternatives --config javac}}
{{echo $(($NR_OF_JRE_OPTIONS - 1)) | sudo alternatives --config java}}
(Modified from here: [https://gist.github.com/pstorch/c217d8324c4133a003c4] )
> Java version issues with Sqoop on AWS EMR
> -----------------------------------------
>
> Key: SQOOP-3397
> URL: https://issues.apache.org/jira/browse/SQOOP-3397
> Project: Sqoop
> Issue Type: Bug
> Affects Versions: 1.4.7
> Environment: Amazon EMR emr-5.14.0 and up.
> Reporter: Devin G. Bost
> Priority: Major
>
> The current build of Sqoop 1.4.7 appears to require Java 7.
> The version of Sqoop 1.4.7 on Amazon's Elastic Map Reduce (EMR) platform
> appears to be running on Java 8.
> We need a way to be able to build Sqoop extensions on Java 8 so that they are
> compatible with the version of Java running on the EMR versions of Sqoop.
> Otherwise, when attempts to run the extension of Sqoop are made (such as for
> a custom Manager class), Java version mismatch errors occur that block
> compilation of the class files that need to be generated for imports.
> How can we build Sqoop 1.4.7 on Java 8 so that extensions and plugins can be
> built with Java 8 so that they will still be compatible with the architecture
> of the other Apache tools (such as Hadoop) that otherwise break on EMR
> instances when the Java version must be switched to Java 7 to support Sqoop
> extensions and plugins?
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