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From "ASF GitHub Bot (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 Wed, 08 Mar 2017 21:59:38 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15902036#comment-15902036
] 

ASF GitHub Bot commented on DRILL-5316:
---------------------------------------

Github user laurentgo commented on a diff in the pull request:

    https://github.com/apache/drill/pull/772#discussion_r105034016
  
    --- Diff: contrib/native/client/src/clientlib/drillClientImpl.cpp ---
    @@ -2143,6 +2146,9 @@ connectionStatus_t PooledDrillClientImpl::connect(const char* connStr,
DrillUser
                 Utils::shuffle(drillbits);
                 // The original shuffled order is maintained if we shuffle first and then
add any missing elements
                 Utils::add(m_drillbits, drillbits);
    +            if (m_drillbits.empty()){
    +                return handleConnError(CONN_FAILURE, getMessage(ERR_CONN_ZKNODBIT));
    --- End diff --
    
    can be done before the shuffle (it should not change the number of elements)


> 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
>            Priority: Critical
>
> 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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