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Posted to common-issues@hadoop.apache.org by "John Zhuge (JIRA)" <ji...@apache.org> on 2016/08/09 07:32:22 UTC
[jira] [Commented] (HADOOP-13191) FileSystem#listStatus should not
return null
[ https://issues.apache.org/jira/browse/HADOOP-13191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15413106#comment-15413106 ]
John Zhuge commented on HADOOP-13191:
-------------------------------------
Unit test timeout is unrelated to the patch.
> FileSystem#listStatus should not return null
> --------------------------------------------
>
> Key: HADOOP-13191
> URL: https://issues.apache.org/jira/browse/HADOOP-13191
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 2.6.0
> Reporter: John Zhuge
> Assignee: John Zhuge
> Priority: Minor
> Attachments: HADOOP-13191.001.patch, HADOOP-13191.002.patch, HADOOP-13191.003.patch, HADOOP-13191.004.patch
>
>
> This came out of discussion in HADOOP-12718. The {{FileSystem#listStatus}} contract does not indicate {{null}} is a valid return and some callers do not test {{null}} before use:
> AbstractContractGetFileStatusTest#testListStatusEmptyDirectory:
> {code}
> assertEquals("ls on an empty directory not of length 0", 0,
> fs.listStatus(subfolder).length);
> {code}
> ChecksumFileSystem#copyToLocalFile:
> {code}
> FileStatus[] srcs = listStatus(src);
> for (FileStatus srcFile : srcs) {
> {code}
> SimpleCopyLIsting#getFileStatus:
> {code}
> FileStatus[] fileStatuses = fileSystem.listStatus(path);
> if (excludeList != null && excludeList.size() > 0) {
> ArrayList<FileStatus> fileStatusList = new ArrayList<>();
> for(FileStatus status : fileStatuses) {
> {code}
> IMHO, there is no good reason for {{listStatus}} to return {{null}}. It should throw IOExceptions upon errors or return empty list.
> To enforce the contract that null is an invalid return, update javadoc and leverage @Nullable/@NotNull/@Nonnull annotations.
> So far, I am only aware of the following functions that can return null:
> * RawLocalFileSystem#listStatus
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