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- The peer_wants_leases() changes pulled up from 3.1.0 were corrected,

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'never used' leases will no longer consistently shift between servers
  on every pool rebalance run.  [ISC-Bugs #17211]
This commit is contained in:
David Hankins 2007-10-09 22:32:49 +00:00
parent f765ec3672
commit edb1283e10
2 changed files with 35 additions and 8 deletions
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4
RELNOTES
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@ -57,6 +57,10 @@ suggested fixes to <dhcp-users@isc.org>.
- A number of bugs with the internal handling of lease state on the
server have been fixed. Some of these could cause server crashes.
- The peer_wants_leases() changes pulled up from 3.1.0 were corrected,
'never used' leases will no longer consistently shift between servers
on every pool rebalance run.
Changes since 4.0.0a3
- The DHCP server no longer requires a "ddns-update-style" statement,

39
server/failover.c
View File

@ -2362,17 +2362,40 @@ static int dhcp_failover_pool_dobalance(dhcp_failover_state_t *state)
pass = 0;
lease_reference(&lp, *lq, MDL);
/* In the case where there are 2 leases, hold is zero, and
* lts is 1 if both leases are on the local server. If
* there is only 1 lease, both lts and hold are zero. Let's
* not play ping pong.
*/
while (lp && (lts > (pass ? hold : -hold))) {
while (lp) {
if (next)
lease_dereference(&next, MDL);
if (lp->next)
lease_reference(&next, lp->next, MDL);
/*
* Stop if the pool is 'balanced enough.'
*
* The pool is balanced enough if:
*
* 1) We're on the first run through and the peer has
* its fair share of leases already (lts reaches
* -hold).
* 2) We're on the second run through, we are shifting
* never-used leases, and there is a perfectly even
* balance (lts reaches zero).
* 3) Second run through, we are shifting previously
* used leases, and the local system has its fair
* share but no more (lts reaches hold).
*
* Note that this is implemented below in 3,2,1 order.
*/
if (pass) {
if (lp->ends) {
if (lts <= hold)
break;
} else {
if (lts <= 0)
break;
}
} else if (lts <= -hold)
break;
if (pass || peer_wants_lease(lp)) {
--lts;
++leases_queued;
@ -5512,8 +5535,8 @@ peer_wants_lease(struct lease *lp)
*/
hbaix = loadb_p_hash(lp->hardware_addr.hbuf + 1,
lp->hardware_addr.hlen - 1);
else /* Consistent 50/50 split */
return(lp->ip_addr.iabuf[lp->ip_addr.len-1] & 0x01);
else /* impossible to categorize into LBA */
return 0;
hm = state->hba[(hbaix >> 3) & 0x1F] & (1 << (hbaix & 0x07));