Ivan Veselovsky created IGNITE-761:
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Summary: User context set via ugi.doAs() is not always passed to
2ndary fs of IgniteHadoopFileSystem created in the same process
Key: IGNITE-761
URL: https://issues.apache.org/jira/browse/IGNITE-761
Project: Ignite
Issue Type: Task
Components: hadoop
Reporter: Ivan Veselovsky
Assignee: Ivan Veselovsky
Spawned from https://issues.apache.org/jira/browse/IGNITE-218 :
When a mapred task is working in Ignite node, it may access
IgniteHadoopFileSystem, which, in turn, may have a secondary file system.
Solving the issue 218 we tried to pass the user context of the mapred task
using standard Hadoop mechanism ugi.doAs().
But experiments show that this user context is not always correctly passed to
the IgniteHadoopFileSystem constructor.
Preliminary investigation shows that Principal list got from the Subject are
empty. This happens because the principal list is got by class key, in case of
Hadoop this is User.class. But if the caller class "User.class" is loaded by
another classloader, that class is not identical to the class "User.class" that
was used upon Principal creation, so the returned list is empty.
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