postgres not deleting trigger file

Im using postgres 9.4 with pgpool-II-94 and have streaming resplication setup
between two db servers. When I fail the primary db, pgpool creates the
/tmp/trigger_file, and the secondary server becomes the primary and is put
in read/write mode. However, the trigger file doesnt get deleted. I am not
sure where to debug why the trigger file doesnt get removed.

I have even tried using a recover_end_command to remove the trigger file,
but that doesnt seem to happen.

my failover script for pgpool creates the trigger file, then set it to chmod
777 so that postgres user can remove it. pgpool runs as root, while postgres
runs as postgres user.

Any ideas where to look on this issue of trigger file not being removed?

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