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From "Aaron T. Myers" <...@cloudera.com>
Subject Re: A possible bug in unit test: TestDFSShell.testPut()
Date Wed, 12 Oct 2011 16:39:30 GMT
Hi Hou Song,

This sounds like a bug to me. Please file a JIRA in the HDFS project by
going to this link:

Aaron T. Myers
Software Engineer, Cloudera

2011/10/12 侯松 <housong.pt@taobao.com>

> Hi all,
> Recently I am rewriting testcases of Hadoop, and I’ve just found a possible
> bug in TestDFSShell.testPut().
> 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.
> Any of you have any ideas about this issue?
> Thanks a lot!
> Hou Song
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