mtree reload commands don't remove items from memory - sr-users

18 May 2014


      i started to wonder why routing was sometimes wrong in my proxy and
after studying the issue, i came to the conclusion that mtree reload
commands (mi or rpc) don't remove entries from memory when they are
removed from database.
i started my proxy with empty mtrees db table (and empty memory table):
# sip-proxy_ctl mi mt_summary
MT::  TNAME=lp_out TTYPE=0 MEMSIZE=0 NRNODES=0 NRITEMS=0 RELOADCOUNT=0 RELOADTIME=1400419785
then i added one entry to db table and gave reload command.  after that
one entry correctly showed up in memory table:
# sip-proxy_ctl mi mt_summary
MT::  TNAME=lp_out TTYPE=0 MEMSIZE=1636 NRNODES=6 NRITEMS=1 RELOADCOUNT=1 RELOADTIME=1400419817
then i deleted the only entry from db, verified with phpmyadmin that
the table really was empty, and gave again reload command.  that command
didn't have any effect in memory table:
# sip-proxy_ctl mi mt_summary
MT::  TNAME=lp_out TTYPE=0 MEMSIZE=1636 NRNODES=6 NRITEMS=1 RELOADCOUNT=1 RELOADTIME=1400419817
not even reload count got incremented.
after that i went and added some debug to rpc_mtree_reload function and
got this:
May 18 16:30:17 siika /usr/sbin/sip-proxy[26536]: INFO: mtree [mtree_mod.c:1169]: rpc_mtree_reload(): reloading from db 'lp_out'
the info is here:
LM_INFO("reloading from db '%.*s'\n", pt->tname.len, pt->tname.s);
    			if(mt_load_db(pt)!=0)
    			{
    				LM_ERR("cannot re-load mtree from database\n");	
    				goto error;
    			}
my conclusion is that mt_load_db() function is somehow broken.
-- juha