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From "Lisheng Sun (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-16112) After exist the baseTrashPath's subDir, delete the subDir leads to don't modify baseTrashPath
Date Mon, 18 Feb 2019 09:54:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-16112?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lisheng Sun updated HADOOP-16112:
---------------------------------
    Attachment: HADOOP-16112.001.patch

> After exist the baseTrashPath's subDir, delete the subDir leads to don't modify baseTrashPath
> ---------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-16112
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16112
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: common
>    Affects Versions: 3.2.0
>            Reporter: Lisheng Sun
>            Priority: Major
>         Attachments: HADOOP-16112.001.patch
>
>
> There is race condition in TrashPolicyDefault#moveToTrash
> try {
>  if (!fs.mkdirs(baseTrashPath, PERMISSION))
> { // create current LOG.warn("Can't create(mkdir) trash directory: " + baseTrashPath);
return false; }
> } catch (FileAlreadyExistsException e) {
>  // find the path which is not a directory, and modify baseTrashPath
>  // & trashPath, then mkdirs
>  Path existsFilePath = baseTrashPath;
>  while (!fs.exists(existsFilePath))
> { existsFilePath = existsFilePath.getParent(); }
> {color:#ff0000}// case{color}
> {color:#ff0000}  other thread deletes existsFilePath here ,the results doesn't  meet
expectation{color}
> {color:#ff0000} for example{color}
> {color:#ff0000}   there is /user/u_sunlisheng/.Trash/Current/user/u_sunlisheng/b{color}
> {color:#ff0000}   when delete /user/u_sunlisheng/b/a. if existsFilePath is deleted,
the result is /user/u_sunlisheng/.Trash/Current/user/u_sunlisheng+timstamp/b/a{color}
> {color:#ff0000}  so  when existsFilePath is deleted, don't modify baseTrashPath. 
  {color}
> baseTrashPath = new Path(baseTrashPath.toString().replace(
>  existsFilePath.toString(), existsFilePath.toString() + Time.now())
>  );
> trashPath = new Path(baseTrashPath, trashPath.getName());
>  // retry, ignore current failure
>  --i;
>  continue;
>  } catch (IOException e)
> { LOG.warn("Can't create trash directory: " + baseTrashPath, e); cause = e; break; }



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