[pgpool-committers: 4271] pgpool: Add debugging/testing aid for health check.

[Tatsuo Ishii]

Add debugging/testing aid for health check.

By creating logidr/backend_down_request file, an artificial backend
error can be raised in heal check. The file should contain:

    node_id[TAB]down

Example:
1	down

If the health check process finds such a line in the file, failover is
triggered.
After this, the line is rewritten to:
1     already_down

to prevent infinite failover requests.

This feature can only be enabled by defining the C compiler definition
in the source src/main/health_check.c around line 75.

Branch
------
master

Details
-------
https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=0f75428cf805bb4cf3127f8ea1470507da0d2c2a

Modified Files
--------------
src/main/health_check.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 125 insertions(+)