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https://issues.apache.org/jira/browse/HDFS-15532?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uma Maheswara Rao G updated HDFS-15532:
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Fix Version/s: 3.4.0
3.3.1
Hadoop Flags: Reviewed
Resolution: Fixed
Status: Resolved (was: Patch Available)
> listFiles on root/InternalDir will fail if fallback root has file
> -----------------------------------------------------------------
>
> Key: HDFS-15532
> URL: https://issues.apache.org/jira/browse/HDFS-15532
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: 3.4.0
> Reporter: Uma Maheswara Rao G
> Assignee: Uma Maheswara Rao G
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.3.1, 3.4.0
>
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> listFiles implementation gets the RemoteIterator created in
> InternalViewFSDirFs as the root is an InternalViewFSDir.
> If there is a fallback and a file exist at root level, it would have
> collected when collecting locatedStatuses.
> When its iterating over to that fallbacks file from RemoteIterator (which
> was returned from InternalViewFSDirFs ), iterator's next will will call
> getFileBlockLocations if it's a file.
> {code:java}
> @Override
> public LocatedFileStatus next() throws IOException {
> System.out.println(this);
> if (!hasNext()) {
> throw new NoSuchElementException("No more entries in " + f);
> }
> FileStatus result = stats[i++];
> // for files, use getBlockLocations(FileStatus, int, int) to avoid
> // calling getFileStatus(Path) to load the FileStatus again
> BlockLocation[] locs = result.isFile() ?
> getFileBlockLocations(result, 0, result.getLen()) :
> null;
> return new LocatedFileStatus(result, locs);
> }{code}
>
> this getFileBlockLocations will be made on InternalViewFSDirFs, as that
> Iterator created originally from that fs.
> InternalViewFSDirFs#getFileBlockLocations does not handle fallback cases.
> It's always expecting "/", this means it always assuming the dir.
> But with the fallback and returning Iterator from InternalViewFSDirFs, will
> create problems.
> Probably we need to handle fallback case in getFileBlockLocations as well.(
> Fallback only should be the reason for call coming to InternalViewFSDirFs
> with other than "/")
>
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