Hi Hou Song, This sounds like a bug to me. Please file a JIRA in the HDFS project by going to this link: https://issues.apache.org/jira/secure/CreateIssue!default.jspa
-- Aaron T. Myers Software Engineer, Cloudera 2011/10/12 侯松 <housong...@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 > > ________________________________ > > This email (including any attachments) is confidential and may be legally > privileged. If you received this email in error, please delete it > immediately and do not copy it or use it for any purpose or disclose its > contents to any other person. Thank you. > > > 本电邮(包括任何附件)可能含有机密资料并受法律保护。如您不是正确的收件人，请您立即删除本邮件。请不要将本电邮进行复制并用作任何其他用途、或透露本邮件之内容。谢谢。 >
