Tibor Kiss created HDFS-10355:
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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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