[HDFS-7733] NFS: readdir/readdirplus return null directory attribute on failure

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.6.1, 3.0.0-alpha1
• Component/s: nfs
• Labels: 2.6.1-candidate
• Hadoop Flags: Reviewed
• Assignee: Arpit Agarwal
• Reporter: Arpit Agarwal
• Created: 03/Feb/15 23:07
• Updated: 30/Aug/16 01:39
• Resolved: 05/Feb/15 00:27

Description

NFS readdir and readdirplus operations return a null directory attribute on some failure paths. This causes clients to get a 'Stale file handle' error which can only be fixed by unmounting and remounting the share.

The issue can be reproduced by running 'ls' against a large directory which is being actively modified, triggering the 'cookie mismatch' failure path.

        } else {
          LOG.error("cookieverf mismatch. request cookieverf: " + cookieVerf
              + " dir cookieverf: " + dirStatus.getModificationTime());
          return new READDIRPLUS3Response(Nfs3Status.NFS3ERR_BAD_COOKIE);
        }

Thanks to Brandon Li for catching the issue.