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https://issues.apache.org/jira/browse/HDFS-12450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16167120#comment-16167120
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Íñigo Goiri commented on HDFS-12450:
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The {{TestNamenodeHeartbeat}} is fixed now.
Not sure I agree with FindBugs regarding the {{keyset()}}.
If we want to get the only element of a set, I think this is the way.
> Fixing TestNamenodeHeartbeat and support non-HA
> -----------------------------------------------
>
> Key: HDFS-12450
> URL: https://issues.apache.org/jira/browse/HDFS-12450
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: fs
> Reporter: Íñigo Goiri
> Assignee: Íñigo Goiri
> Fix For: HDFS-10467
>
> Attachments: HDFS-12450-HDFS-10467.000.patch
>
>
> The way the service RPC address is obtained changed and showed a problem with
> {{TestNamenodeHeartbeat}} where the address wasn't properly set for the unit
> tests.
> In addition, the {{NamenodeHeartbeatService}} did not provide a good
> experience for non-HA nameservices. This also covers a better logging for
> those.
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