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https://issues.apache.org/jira/browse/DRILL-5316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15952903#comment-15952903
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Robert Hou commented on DRILL-5316:
-----------------------------------

I repeated the steps above, with v1.3.6 on Windows.  This time, there is a 
single error, and the error code is different.

ERROR [08S01] [MapR][Drill] (10) Failure occurred while trying to connect to 
zk=10.10.100.186:5181/drill/drillbits1

> C++ Client Crashes When drillbitsVector.count is 0 after zoo_get_children 
> completed with ZOK
> --------------------------------------------------------------------------------------------
>
>                 Key: DRILL-5316
>                 URL: https://issues.apache.org/jira/browse/DRILL-5316
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Client - C++
>            Reporter: Rob Wu
>            Assignee: Chun Chang
>            Priority: Critical
>              Labels: ready-to-commit
>             Fix For: 1.11.0
>
>
> When connecting to drillbit with Zookeeper, occasionally the C++ client would 
> crash without any reason.
> A further look into the code revealed that during this call 
> rc=zoo_get_children(p_zh.get(), m_path.c_str(), 0, &drillbitsVector); 
> zoo_get_children returns ZOK (0) but drillbitsVector.count is 0.
> This causes drillbits to stay empty and thus 
> causes err = zook.getEndPoint(drillbits[drillbits.size() -1], endpoint); to 
> crash
> Size check should be done to prevent this from happening



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