[jira] [Created] (HDFS-10355) Fix thread_local related build issue on Mac OS X

["Tibor Kiss (JIRA)" <ji...@apache.org>]

Tibor Kiss created HDFS-10355:
---------------------------------

             Summary: Fix thread_local related build issue on Mac OS X
                 Key: HDFS-10355
                 URL: https://issues.apache.org/jira/browse/HDFS-10355
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: hdfs-client
         Environment: OS: Mac OS X 10.11
clang: Apple LLVM version 7.0.2 (clang-700.1.81)
            Reporter: Tibor Kiss


The native hdfs library uses C++11 features heavily.
One of such feature is thread_local storage class which is supported in GCC, Visual Studio and the community version of clang compiler, but not by Apple's clang (which is default on OS X boxes). 
See further details here: http://stackoverflow.com/a/29929949

Even though not many Hadoop cluster runs on OS X developers still use this platform for development.

The problem can be solved multiple ways:
 a) Stick to gcc/g++ or community based clang on OS X. Developers will need extra steps to build Hadoop.
 b) Workaround thread_local with a helper class.
 c) Get rid of all the globals marked with thread_local. Interface change will be erquired.
 d) Disable multi threading support in the native client on OS X and document this limitation. 

Compile error related to thread_local:
{noformat}
     [exec] /Users/tiborkiss/workspace/apache-hadoop/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/bindings/c/hdfs.cc:66:1: error: thread-local storage is not supported for the current target
     [exec] thread_local std::string errstr;
     [exec] ^
     [exec] 1 warning and 1 error generated.
     [exec] make[2]: *** [main/native/libhdfspp/lib/bindings/c/CMakeFiles/bindings_c_obj.dir/hdfs.cc.o] Error 1
     [exec] make[1]: *** [main/native/libhdfspp/lib/bindings/c/CMakeFiles/bindings_c_obj.dir/all] Error 2
     [exec] make: *** [all] Error 2
{noformat}



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