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https://issues.apache.org/jira/browse/HDFS-13371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16419461#comment-16419461
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Íñigo Goiri commented on HDFS-13371:
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{quote}
Handling optional PB fields when re-encoding the (decoded) response back into a
PB.
{quote}
Correct. In our current setup, all the components have the same version.
Is there a good way to handle this other than having test coverage for this
(which I'm not even sure how) and catching when new optional fields are added?
> NPE for FsServerDefaults.getKeyProviderUri() for clientProtocol communication
> between 2.7 and 3.2
> -------------------------------------------------------------------------------------------------
>
> Key: HDFS-13371
> URL: https://issues.apache.org/jira/browse/HDFS-13371
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.1.0, 3.2.0
> Reporter: Sherwood Zheng
> Assignee: Sherwood Zheng
> Priority: Major
> Labels: common
> Attachments: HADOOP-15336.000.patch, HADOOP-15336.001.patch
>
>
> KeyProviderUri is not available in 2.7 so when 2.7 clients contact with 3.2
> services, it cannot find the key provider URI and triggers a
> NullPointerException.
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