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From "Rob Wu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5316) C++ Client Crashes When drillbitsVector.count is 0 after zoo_get_children completed with ZOK
Date Thu, 30 Mar 2017 01:11:42 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15948192#comment-15948192
] 

Rob Wu commented on DRILL-5316:
-------------------------------

Hi [~rhou] v1.3.4.0024's Drill Client contains this patch. You would have to test with driver
prior to 1.3.4.

> 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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