I am a researcher at UBC I am trying to understand relationships between the 
issues in HADOOP Jira issue repository.
There are 20 possible relationships shown below. I want to understand for 
HADOOP what is the hierarchy of issues. For example, if you are given an issue 
and you want to break it down into sub-issues would you label the sub-issues 
with “blocks" or "is blocked by"?  Or are the possible relationships parallel? 

In the following possible relationships found in HADOOP. I consider 

A       'incorporates'          B
C       'relates to’            D
E       'requires'                      F
G       'blocks'                        H
I       'contains'                      J
K       'breaks'                        L
M       'depends upon'  N
O       'supercedes’            P
Q       'duplicates'            R
S       'is a clone of'         T


Here is the same list but with the reverse of the previous list.

B       'is part of'                            A
D       'is related to'                 C
F       'is required by'                        E
H       'is blocked by'                 G
J       'Is contained by'               I
L       'is broken by'                  K
N       'is depended upon by'   M
P       'is superceded by'              O
R       'is duplicated by'              Q
T       'is cloned as’                  S


For A-S Wich would be the issue? and which ones would be considered the 
sub-issues?

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