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From "Andras Bokor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13191) FileSystem#listStatus should not return null
Date Sat, 21 May 2016 21:35:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15295274#comment-15295274
] 

Andras Bokor commented on HADOOP-13191:
---------------------------------------

I have met with the same. Please check HADOOP-7352. You can find a previous conversation about
the same issue.

> 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
>
> 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 return
empty list instead.
> To enforce the contract that null is an invalid return, update javadoc and consider Intellij
IDEA's @Nullable and @NotNull annotations.
> So far, I am only aware of the following functions that can return null:
> * RawLocalFileSystem#listStatus



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