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https://issues.apache.org/jira/browse/HDDS-1525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16851585#comment-16851585
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Xiaoyu Yao commented on HDDS-1525:
----------------------------------

Attach a POC patch on top of ozone-0.4.0 that works with hadoop 2.7.6.

A simplified non-secure docker-compose for mr that runs 
wordcount/teragen/terasort/teravalidate successfully.  

> Mapreduce failure when using Hadoop 2.7.5
> -----------------------------------------
>
>                 Key: HDDS-1525
>                 URL: https://issues.apache.org/jira/browse/HDDS-1525
>             Project: Hadoop Distributed Data Store
>          Issue Type: Bug
>          Components: Ozone Filesystem
>    Affects Versions: 0.4.0
>            Reporter: Sammi Chen
>            Priority: Major
>         Attachments: HDDS-1525.poc.patch, teragen.log
>
>
> Integrate Ozone(0.4 branch) with Hadoop 2.7.5, "hdfs dfs -ls /" can pass, 
> while teragen  failed. 
> When add  -verbose:class to java options, it shows that class KeyProvider is 
> loaded twice by different classloader while it is only loaded once when 
> execute  "hdfs dfs -ls /" 
> All jars under share/ozone/lib are added into hadoop classpath except ozone 
> file system current lib jar.



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