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From "Hou Song (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2443) A bug in unit test: TestDFSShell.testPut()
Date Thu, 13 Oct 2011 02:09:11 GMT
A bug in unit test: TestDFSShell.testPut()

                 Key: HDFS-2443
                 URL: https://issues.apache.org/jira/browse/HDFS-2443
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: test
    Affects Versions: 0.21.0
            Reporter: Hou Song

testPut() tries to copy a file from local to a destination "dst" in HDFS, and uses a SecurityManager
to capture this action. The new SecurityManager filters out this copy action from all actions
it receives , and starts a second thread to copy a second file to the same destination "dst"
in HDFS. The main thread sleeps 5 seconds immediately after. I think the original purpose
is that, the copy from the main thread should succeed, and the second copy from the new thread
should fail because the "dst" is being written. My guess can be confirmed by the asserts around
these codes.

However, the filter in the new SecurityManager is not right. It tries to find "FileUtil.copyContent",
but these is no method called copyContent in FileUtil, and therefore the second thread is
never started. Although the asserts always succeed, this code is not able to find bugs in
this area.

I also debugged it, and I can never hit the break points in the second copy thread. Even though
I changed the filter from "FileUtil.copyContent" to "FileUtil.copy" and successfully started
the second thread, the second thread succeeds before the main thread resumes, which is the
opposite of the logic.

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