James Clampffer created HDFS-13745:
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             Summary: libhdfs++: Fix race in FileSystem destructor
                 Key: HDFS-13745
                 URL: https://issues.apache.org/jira/browse/HDFS-13745
             Project: Hadoop HDFS
          Issue Type: Task
          Components: native
            Reporter: James Clampffer
            Assignee: James Clampffer


Whatever happens to have the last shared_ptr to the IoService will run 
~IoService when the shared_ptr goes out of scope.  IoService's destructor is 
responsible for joining all worker threads in the pool.  Most callbacks now own 
weak_ptr<IoService> that can be promoted to a shared_ptr in order to post new 
async tasks.  If a callback object is the last thing holding the IoService 
shared_ptr it's going to try to join the thread pool inside of one of the 
thread pool's threads.



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