[HDFS-15426] Fix ContentSummary for mount links in ViewFileSystemOverloadScheme

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Component/s: viewfs, viewfsOverloadScheme
• Assignee: Unassigned
• Reporter: Ayush Saxena
• Created: 21/Jun/20 14:27
• Updated: 22/Jun/20 02:51
• Resolved: 21/Jun/20 21:42

Description

Ex. Mount Table has only two entries.  /dir/int

getContentSummary on / throws :

java.io.IOException: Internal implementation error: expected file name to be /	at org.apache.hadoop.fs.viewfs.ViewFileSystem$InternalDirOfViewFs.checkPathIsSlash(ViewFileSystem.java:1148)
	at org.apache.hadoop.fs.viewfs.ViewFileSystem$InternalDirOfViewFs.getFileStatus(ViewFileSystem.java:1215)
	at org.apache.hadoop.fs.FileSystem.getContentSummary(FileSystem.java:1788)
	at org.apache.hadoop.fs.FileSystem.getContentSummary(FileSystem.java:1799)
	at org.apache.hadoop.fs.viewfs.ViewFileSystem.getContentSummary(ViewFileSystem.java:892)

The getContentSummary on / gets /dir, /dir has isDirectory true, so again getContentSummary on /dir is called. But the filesystem is Internal View FS and expects the path to be / only

Issue Links

• duplicates: HADOOP-17032 Handle an internal dir in viewfs having multiple children mount points pointing to different filesystems
• links to: Github PR #2086