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This program tests dead member detection feature on Load Balancer.
The group uses infrastructure controlled membership. Three factories
(servers) are created and added to the object group. The client use
the group object reference to make invocations.
The test covers 4 test cases.
1) Dead Member Detection with Round Robin Strategy
a. Invoke get_string(), the server 1 is active and picked to
handle request.
Invoke exit () to crash server 1.
b. Invoke exit () on crash server 2.
c. Invoke get_string(), the server 3 is picked to handle request.
Invoke exit () to crash server 3.
d. Invoke get_string(), no active member so client gets OBJECT_NOT_EXIST
exception.
2) Hang Member Detection with Round Robin Strategy
a. Invoke get_string(), the server 1 is active and picked to
handle request.
Invoke exit () to crash server 1.
b. Invoke get_string(), liveliness check on server 2 and it timed
out on RECV because _non_existent implementation on server side
has a delay to similate a hang server. The server 2 is still
picked. The client request may be delayed but it should still
get reply. Invoke exit on the server 2 and the LB may detect
it's lost.
c. Invoke get_string(), the server 3 is active and picked to
handle request.
Invoke exit () to crash server 3.
c. Invoke get_string(), if LB has detected server 2 lost then
client should get OBJECT_NOT_EXIST exception. If not detected
it will return server 2 reference and the client invocation
may get COMM_FAILURE or TRANSIENT exception.
3) Dead Member Detection with Random Strategy
a. Invoke get_string(), a random server (e.g. 2) is active and picked to
handle request.
Invoke exit () to crash the server.
b. Invoke get_string(), a random server (e.g. 1) except server picked in
step a) is picked to handle request.
Invoke exit () to crash the server.
c. Invoke get_string(), the last server (e.g. 3) is active and picked to
handle request.
Invoke exit () to crash the server.
d. Invoke get_string(), no active member so client gets OBJECT_NOT_EXIST
exception.
4) Hang Member Detection with Random Strategy
a. Invoke get_string(), a random server (e.g. 1) is active and picked to
handle request.
Invoke exit () to crash the server.
b. Invoke get_string(), a random server (e.g. 2) except server picked in
step a) is picked. Even the server 2 times out on liveliness check
because of the delay in _non_existent implementation, it can still be
picked. The client request may be delayed but it should finally
complete.
Invoke exit () to crash the server.
c. Invoke get_string(), the server not picked (e.g. 3) will be picked
and client get reply from the server.
Invoke exit () to crash the server.
c. Invoke get_string(), if LB has detected server 2 lost then
client should get OBJECT_NOT_EXIST exception. If not detected
it will return server 2 reference and the client invocation
may get COMM_FAILURE or TRANSIENT exception.
To run the test use the run_test.pl script:
$ ./run_test.pl
The script returns 0 if the test was successful and each test case
should print out "test passed.".
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