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From "James Clampffer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11294) libhdfs++: Segfault in HA failover if DNS lookup for both Namenodes fails
Date Mon, 18 Sep 2017 18:16:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16170426#comment-16170426
] 

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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