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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11294) libhdfs++: Segfault in HA failover if DNS lookup for both Namenodes fails
Date Thu, 31 Aug 2017 15:34:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11294?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16149138#comment-16149138
] 

Hadoop QA commented on HDFS-11294:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m  0s{color} | {color:blue}
Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  2m 34s{color} | {color:red}
HDFS-11294 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-11294 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12884689/HDFS-8707.HDFS-11294.000.patch
|
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/20940/console |
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This message was automatically generated.



> 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-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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