Failed to open file: Permission denied? - file

Question

I am running logstash-1.4.1 on Ubuntu and get the following error:
failed to open /home/Desktop/Input/2014-10-02/abc.log: Permission denied - /home/Desktop/Input/2014-10-02/abc.log {:level=>:warn, :file=>"filewatch/tail.rb", :line=>"107"}
Background:
I copied the directory structure of logs from a remote server to my local machine. Now, on running logstash on my local machine on the directory structure I copied, this error occurs.
When I check permissions on the file, it's showing both read write.
Any idea?
As I now checked the logstash console, it's evident that logstash is opening some files and after that permission denied starts coming till end.
CONSOLE:
_open_file: /home/Desktop/Input/2014-10-11/abc.log: opening {:level=>:debug, :file=>"filewatch/tail.rb", :line=>"98"}
/home/Desktop/Input/2014-10-11/abc.log: initial create, no sincedb, **seeking to beginning** of file {:level=>:debug, :file=>"filewatch/tail.rb", :line=>"133"}
_open_file: /home/Desktop/Input/2014-10-21/abc.log: opening {:level=>:debug, :file=>"filewatch/tail.rb", :line=>"98"}
/home/Desktop/Input/2014-10-21/abc.log: initial create, no sincedb, **seeking to beginning** of file {:level=>:debug, :file=>"filewatch/tail.rb", :line=>"133"}
_open_file: /home/Desktop/Input/2014-11-04/abc.log: opening {:level=>:debug, :file=>"filewatch/tail.rb", :line=>"98"}
failed to open /home/Desktop/Input/2014-11-04/abc.log: **Permission denied** - /home/Desktop/Input/2014-11-04/abc.log {:level=>:warn, :file=>"filewatch/tail.rb", :line=>"107"}
_open_file: /home/Desktop/Input/2014-10-10/abc.log: opening {:level=>:debug, :file=>"filewatch/tail.rb", :line=>"98"}
failed to open /home/Desktop/Input/2014-10-10/abc.log: **Permission denied** - /home/Desktop/Input/2014-10-10/abc.log {:level=>:warn, :file=>"filewatch/tail.rb", :line=>"107"}
Is it because of some limit might be there to number of files opened, as logstash is opening files till a limit and after that gives permission denied errors??
My file permissions for files it gives permission denied error:
ls -l ./Input/2014-11-04/abc.log
-rw-rw-r-- 1 userA userA 0 Nov 12 09:56 ./Input/2014-11-04/abc.log
ls -ld ./Input/2014-11-04
drwxrwxr-x 3 userA userA 4096 Nov 12 09:56 ./Input/2014-11-04
ls -l /home/Desktop/Input/2014-10-10/abc.log
-rw-rw-r-- 1 userA userA 0 Nov 12 09:56 /home/userA/Desktop/Input/2014-10-10/abc.log
ls -ld /home/Desktop/Input/2014-10-10
drwxrwxr-x 2 userA userA 4096 Nov 12 09:56 /home/Desktop/Input/2014-10-10
EDIT:
Logstash is run using userA.
Detailed File Permissions:
ls -ld /home/
drwxr-xr-x 3 root root 4096 Aug 27 2013 /home/
ls -ld /home/Desktop/
drwxr-xr-x 7 userA userA 4096 Nov 12 12:45 /home/Desktop/
ls -ld /home/Desktop/Input/
drwxrwxr-x 47 userA userA 4096 Nov 12 10:50 /home/Desktop/Input/
ls -l /home/Desktop/Input/abc.log
-rw-rw-r-- 1 userA userA 0 Nov 12 09:56 /home/Desktop/Input/abc.log