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https://issues.apache.org/jira/browse/HADOOP-8849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ivan A. Veselovsky updated HADOOP-8849:
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Attachment: HADOOP-8849-vs-trunk-4.patch
corrected the formatting of the code (2 spaces, no tabs.)
> FileUtil#fullyDelete should grant the target directories +rwx permissions
> before trying to delete them
> ------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-8849
> URL: https://issues.apache.org/jira/browse/HADOOP-8849
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Ivan A. Veselovsky
> Assignee: Ivan A. Veselovsky
> Priority: Minor
> Attachments: HADOOP-8849-vs-trunk-4.patch
>
>
> 2 improvements are suggested for implementation of methods
> org.apache.hadoop.fs.FileUtil.fullyDelete(File) and
> org.apache.hadoop.fs.FileUtil.fullyDeleteContents(File):
>
> 1) We should grant +rwx permissions the target directories before trying to
> delete them.
> The mentioned methods fail to delete directories that don't have read or
> execute permissions.
> Actual problem appears if an hdfs-related test is timed out (with a short
> timeout like tens of seconds), and the forked test process is killed, some
> directories are left on disk that are not readable and/or executable. This
> prevents next tests from being executed properly because these directories
> cannot be deleted with FileUtil#fullyDelete(), so many subsequent tests fail.
> So, its recommended to grant the read, write, and execute permissions the
> directories whose content is to be deleted.
> 2) Generic reliability improvement: we shouldn't rely upon File#delete()
> return value, use File#exists() instead.
> FileUtil#fullyDelete() uses return value of method java.io.File#delete(), but
> this is not reliable because File#delete() returns true only if the file was
> deleted as a result of the #delete() method invocation. E.g. in the following
> code
> if (f.exists()) { // 1
> return f.delete(); // 2
> }
> if the file f was deleted by another thread or process between calls "1" and
> "2", this fragment will return "false", while the file f does not exist upon
> the method return.
> So, better to write
> if (f.exists()) {
> f.delete();
> return !f.exists();
> }
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