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https://issues.apache.org/jira/browse/HDFS-11294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16170426#comment-16170426
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James Clampffer commented on HDFS-11294:
----------------------------------------
New tests were added, test4tests just doesn't notice. Trying to sort out test
failure now. Haven't been able to reproduce it on my own docker instance yet.
> libhdfs++: Segfault in HA failover if DNS lookup for both Namenodes fails
> -------------------------------------------------------------------------
>
> Key: HDFS-11294
> URL: https://issues.apache.org/jira/browse/HDFS-11294
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: James Clampffer
> Assignee: James Clampffer
> Attachments: HDFS-11294.HDFS-8707.001.patch,
> HDFS-11294.HDFS-8707.002.patch, HDFS-8707.HDFS-11294.000.patch
>
>
> Hit while doing more manual testing on HDFS-11028.
> The HANamenodeTracker takes an asio endpoint to figure out what endpoint on
> the other node to try next during a failover. This is done by passing the
> element at index 0 from endpoints (a std::vector<asio endpoint>).
> When DNS fails the endpoints vector for that node will be empty so the
> iterator returned by endpoints\[0\] is just a null pointer that gets
> dereferenced and causes a segfault.
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