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https://issues.apache.org/jira/browse/HAWQ-1524?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Radar Lei resolved HAWQ-1524.
-----------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0.0-incubating

Fixed by Shubham Sharma.

> Travis CI build failure after upgrading protobuf to 3.4
> -------------------------------------------------------
>
>                 Key: HAWQ-1524
>                 URL: https://issues.apache.org/jira/browse/HAWQ-1524
>             Project: Apache HAWQ
>          Issue Type: Bug
>          Components: Build
>            Reporter: Shubham Sharma
>            Assignee: Radar Lei
>             Fix For: 2.3.0.0-incubating
>
>
> After upgrading the protobuf version to 3.4 , CI pipeline fails with below 
> errors. From the error message it looks like it is a problem with namespace 
> resolution while declaring stringstream and ostringstream
> {code}
> Error message -
> /Users/travis/build/apache/incubator-hawq/depends/libyarn/src/libyarnclient/LibYarnClient.cpp:248:9:
> error: unknown type name 'stringstream'; did you mean
> 'std::stringstream'?
>         stringstream ss;
>         ^~~~~~~~~~~~
>         std::stringstream
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/iosfwd:153:38:
> note: 'std::stringstream' declared here
> typedef basic_stringstream<char> stringstream;
> /Users/travis/build/apache/incubator-hawq/depends/libyarn/src/libyarnclient/LibYarnClient.cpp:299:13:
> error: unknown type name 'ostringstream'; did you mean
> 'std::ostringstream'?
>             ostringstream key;
>             ^~~~~~~~~~~~~
>             std::ostringstream
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/iosfwd:152:38:
> note: 'std::ostringstream' declared here
> typedef basic_ostringstream<char>    ostringstream;
> {code}



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