merge cluster fixes from release_2_0 branch
This commit is contained in:
Brendan O'Dea
parent
211cb9427c
commit
83699acac6
8 changed files with 143 additions and 32 deletions
126
cluster.c
126
cluster.c
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@ -1,6 +1,6 @@
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// L2TPNS Clustering Stuff
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char const *cvs_id_cluster = "$Id: cluster.c,v 1.38 2005-05-24 07:45:13 bodea Exp $";
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char const *cvs_id_cluster = "$Id: cluster.c,v 1.39 2005-05-26 12:17:30 bodea Exp $";
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#include <stdio.h>
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#include <stdlib.h>
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@ -193,7 +193,7 @@ static void add_type(char **p, int type, int more, char *data, int size)
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}
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// advertise our presence via BGP or gratuitous ARP
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static void advertise(void)
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static void advertise_routes(void)
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{
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#ifdef BGP
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if (bgp_configured)
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@ -204,6 +204,15 @@ static void advertise(void)
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send_garp(config->bind_address); // Start taking traffic.
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}
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// withdraw our routes (BGP only)
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static void withdraw_routes(void)
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{
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#ifdef BGP
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if (bgp_configured)
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bgp_enable_routing(0);
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#endif /* BGP */
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}
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static void cluster_uptodate(void)
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{
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if (config->cluster_iam_uptodate)
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@ -215,7 +224,7 @@ static void cluster_uptodate(void)
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config->cluster_iam_uptodate = 1;
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LOG(0, 0, 0, "Now uptodate with master.\n");
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advertise();
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advertise_routes();
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}
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//
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@ -457,17 +466,22 @@ void cluster_check_slaves(void)
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continue; // Shutdown peer! Skip them.
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if (peers[i].uptodate)
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have_peers = 1;
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if (!peers[i].uptodate)
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have_peers++;
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else
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config->cluster_iam_uptodate = 0; // Start fast heartbeats
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}
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#ifdef BGP
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// in a cluster, withdraw/add routes when we get a peer/lose all peers
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if (bgp_configured && have_peers != had_peers)
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bgp_enable_routing(!have_peers);
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#endif /* BGP */
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// in a cluster, withdraw/add routes when we get a peer/lose peers
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if (have_peers != had_peers)
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{
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if (had_peers < config->cluster_master_min_adv &&
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have_peers >= config->cluster_master_min_adv)
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withdraw_routes();
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else if (had_peers >= config->cluster_master_min_adv &&
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have_peers < config->cluster_master_min_adv)
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advertise_routes();
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}
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}
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//
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@ -480,20 +494,22 @@ void cluster_check_master(void)
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int last_free = 0;
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clockt t = TIME;
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static int probed = 0;
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int have_peers;
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if (config->cluster_iam_master)
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return; // Only runs on the slaves...
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// If the master is late (missed 2 hearbeats by a second and a
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// hair) it may be that the switch has dropped us from the
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// multicast group, try unicasting one probe to the master
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// multicast group, try unicasting probes to the master
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// which will hopefully respond with a unicast heartbeat that
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// will allow us to limp along until the querier next runs.
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if (TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11))
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if (config->cluster_master_address
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&& TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11))
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{
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if (!probed && config->cluster_master_address)
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if (!probed || (TIME > (probed + 2 * config->cluster_hb_interval)))
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{
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probed = 1;
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probed = TIME;
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LOG(1, 0, 0, "Heartbeat from master %.1fs late, probing...\n",
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0.1 * (TIME - (config->cluster_last_hb + config->cluster_hb_interval)));
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@ -511,7 +527,7 @@ void cluster_check_master(void)
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LOG(0, 0, 0, "Master timed out! Holding election...\n");
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for (i = 0; i < num_peers; i++)
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for (i = have_peers = 0; i < num_peers; i++)
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{
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if ((peers[i].timestamp + config->cluster_hb_timeout) < t)
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continue; // Stale peer! Skip them.
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@ -529,6 +545,9 @@ void cluster_check_master(void)
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LOG(1, 0, 0, "Expecting %s to become master\n", fmtaddr(peers[i].peer, 0));
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return; // They'll win the election. Wait for them to come up.
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}
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if (peers[i].uptodate)
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have_peers++;
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}
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// Wow. it's been ages since I last heard a heartbeat
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@ -540,6 +559,11 @@ void cluster_check_master(void)
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LOG(0, 0, 0, "I am declaring myself the master!\n");
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if (have_peers < config->cluster_master_min_adv)
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advertise_routes();
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else
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withdraw_routes();
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if (config->cluster_seq_number == -1)
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config->cluster_seq_number = 0;
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@ -620,9 +644,6 @@ void cluster_check_master(void)
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config->cluster_undefined_tunnels = 0;
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config->cluster_iam_uptodate = 1; // assume all peers are up-to-date
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if (!num_peers) // lone master
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advertise();
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// FIXME. We need to fix up the tunnel control message
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// queue here! There's a number of other variables we
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// should also update.
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@ -902,6 +923,13 @@ static int cluster_catchup_slave(int seq, in_addr_t slave)
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int diff;
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LOG(1, 0, 0, "Slave %s sent LASTSEEN with seq %d\n", fmtaddr(slave, 0), seq);
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if (!config->cluster_iam_master) {
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LOG(1, 0, 0, "Got LASTSEEN but I'm not a master! Redirecting it to %s.\n",
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fmtaddr(config->cluster_master_address, 0));
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peer_send_message(slave, C_MASTER, config->cluster_master_address, NULL, 0);
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return 0;
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}
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diff = config->cluster_seq_number - seq; // How many packet do we need to send?
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if (diff < 0)
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@ -913,9 +941,11 @@ static int cluster_catchup_slave(int seq, in_addr_t slave)
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return peer_send_message(slave, C_KILL, seq, NULL, 0);// Kill the slave. Nothing else to do.
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}
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LOG(1, 0, 0, "Sending %d catchup packets to slave %s\n", diff, fmtaddr(slave, 0) );
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// Now resend every packet that it missed, in order.
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while (seq != config->cluster_seq_number) {
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s = seq%HB_HISTORY_SIZE;
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s = seq % HB_HISTORY_SIZE;
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if (seq != past_hearts[s].seq) {
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LOG(0, 0, 0, "Tried to re-send heartbeat for %s but %d doesn't match %d! (%d,%d)\n",
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fmtaddr(slave, 0), seq, past_hearts[s].seq, s, config->cluster_seq_number);
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@ -968,8 +998,10 @@ static int cluster_add_peer(in_addr_t peer, time_t basetime, pingt *pp, int size
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}
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// Is this the master shutting down??
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if (peer == config->cluster_master_address && !basetime) {
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LOG(3, 0, 0, "Master %s shutting down...\n", fmtaddr(config->cluster_master_address, 0));
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if (peer == config->cluster_master_address) {
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LOG(3, 0, 0, "Master %s %s\n", fmtaddr(config->cluster_master_address, 0),
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basetime ? "has restarted!" : "shutting down...");
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config->cluster_master_address = 0;
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config->cluster_last_hb = 0; // Force an election.
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cluster_check_master();
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@ -1010,6 +1042,20 @@ static int cluster_add_peer(in_addr_t peer, time_t basetime, pingt *pp, int size
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return 1;
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}
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// A slave responds with C_MASTER when it gets a message which should have gone to a master.
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static int cluster_set_master(in_addr_t peer, in_addr_t master)
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{
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if (config->cluster_iam_master) // Sanity...
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return 0;
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LOG(3, 0, 0, "Peer %s set the master to %s...\n", fmtaddr(peer, 0),
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fmtaddr(master, 1));
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config->cluster_master_address = master;
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cluster_check_master();
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return 0;
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}
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/* Handle the slave updating the byte counters for the master. */
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//
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// Note that we don't mark the session as dirty; We rely on
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@ -1283,9 +1329,33 @@ static int cluster_process_heartbeat(uint8_t *data, int size, int more, uint8_t
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exit(1);
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}
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//
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// Send it a unicast heartbeat to see give it a chance to die.
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// NOTE: It's actually safe to do seq-number - 1 without checking
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// for wrap around.
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//
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cluster_catchup_slave(config->cluster_seq_number - 1, addr);
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return -1; // Skip it.
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}
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//
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// Try and guard against a stray master appearing.
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//
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// Ignore heartbeats received from another master before the
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// timeout (less a smidgen) for the old master has elapsed.
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//
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// Note that after a clean failover, the cluster_master_address
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// is cleared, so this doesn't run.
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//
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if (config->cluster_master_address && addr != config->cluster_master_address
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&& (config->cluster_last_hb + config->cluster_hb_timeout - 11) > TIME) {
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LOG(0, 0, 0, "Ignoring stray heartbeat from %s, current master %s has not yet timed out (last heartbeat %.1f seconds ago).\n",
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fmtaddr(addr, 0), fmtaddr(config->cluster_master_address, 1),
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0.1 * (TIME - config->cluster_last_hb));
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return -1; // ignore
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}
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if (config->cluster_seq_number == -1) // Don't have one. Just align to the master...
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config->cluster_seq_number = h->seq;
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@ -1487,10 +1557,13 @@ int processcluster(char *data, int size, in_addr_t addr)
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s -= sizeof(uint32_t);
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switch (type) {
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case C_PING: // Update the peers table.
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case C_PING: // Update the peers table.
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return cluster_add_peer(addr, more, (pingt *) p, s);
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case C_LASTSEEN: // Catch up a slave (slave missed a packet).
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case C_MASTER: // Our master is wrong
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return cluster_set_master(addr, more);
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case C_LASTSEEN: // Catch up a slave (slave missed a packet).
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return cluster_catchup_slave(more, addr);
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case C_FORWARD: { // Forwarded control packet. pass off to processudp.
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@ -1531,6 +1604,11 @@ int processcluster(char *data, int size, in_addr_t addr)
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return 0;
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case C_BYTES:
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if (!config->cluster_iam_master) {
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LOG(0, 0, 0, "I'm not the master, but I got a C_BYTES from %s?\n", fmtaddr(addr, 0));
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return -1;
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}
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return cluster_handle_bytes(p, s);
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case C_KILL: // The master asked us to die!? (usually because we're too out of date).
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