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From "James Clampffer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11294) libhdfs++: Segfault in HA failover if DNS lookup for both Namenodes fails
Date Thu, 05 Jan 2017 17:05:58 GMT
James Clampffer created HDFS-11294:
--------------------------------------

             Summary: 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
            Reporter: James Clampffer
            Assignee: James Clampffer


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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