[jira] [Created] (ARROW-10012) [C++] Sporadic failures in CopyFiles test

["Antoine Pitrou (Jira)" <ji...@apache.org>]

Antoine Pitrou created ARROW-10012:
--------------------------------------

             Summary: [C++] Sporadic failures in CopyFiles test
                 Key: ARROW-10012
                 URL: https://issues.apache.org/jira/browse/ARROW-10012
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++, Continuous Integration
            Reporter: Antoine Pitrou


Here is an example failure on AppVeyor (Windows):
https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/builds/35210915/job/yhdxkfu7hta3kugp#L1913
{code}
[ RUN      ] TestSubTreeFileSystem.CopyFiles
C:/projects/arrow/cpp/src/arrow/filesystem/filesystem_test.cc(608): error: Failed
'CopyFiles({{subfs_, "ab"}, {subfs_, "cd"}, {subfs_, "ef"}}, {{dest_fs, "AB/ab"}, {dest_fs, "CD/CD/cd"}, {dest_fs, "EF/EF/EF/ef"}})' failed with IOError: Path does not exist 'sub/copy/AB/ab'
[  FAILED  ] TestSubTreeFileSystem.CopyFiles (9 ms)
{code}

Similar failure on Linux, showing the line number:
https://ci.ursalabs.org/#/builders/101/builds/4412/steps/8/logs/stdio
{code}
[ RUN      ] TestSubTreeFileSystem.CopyFiles
../src/arrow/filesystem/filesystem_test.cc:608: Failure
Failed
'CopyFiles({{subfs_, "ab"}, {subfs_, "cd"}, {subfs_, "ef"}}, {{dest_fs, "AB/ab"}, {dest_fs, "CD/CD/cd"}, {dest_fs, "EF/EF/EF/ef"}})' failed with IOError: Path does not exist 'sub/copy/CD/CD/cd'
In ../src/arrow/filesystem/filesystem.cc, line 467, code: (_error_or_value13).status()
[  FAILED  ] TestSubTreeFileSystem.CopyFiles (17 ms)
{code}

The erroring line number (467) corresponds to the {{OpenOutputStream}} call below:
{code:c++}

        auto dest_dir = internal::GetAbstractPathParent(destinations[i].path).first;
        if (!dest_dir.empty()) {
          RETURN_NOT_OK(destinations[i].filesystem->CreateDir(dest_dir));
        }

-->     ARROW_ASSIGN_OR_RAISE(
            auto destination,
            destinations[i].filesystem->OpenOutputStream(destinations[i].path));
{code}

It's not obvious why the error occurs, since the directory is created just above (race condition in the CreateDir implementation?).



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