/* A_ELECTION_COUNT */ void do_election_count_vote(long long action, enum crmd_fsa_cause cause, enum crmd_fsa_state cur_state, enum crmd_fsa_input current_input, fsa_data_t * msg_data) { struct timeval your_age; int age; int election_id = -1; int log_level = LOG_INFO; gboolean use_born_on = FALSE; gboolean done = FALSE; gboolean we_loose = FALSE; const char *op = NULL; const char *vote_from = NULL; const char *your_version = NULL; const char *election_owner = NULL; const char *reason = "unknown"; crm_node_t *our_node = NULL, *your_node = NULL; ha_msg_input_t *vote = fsa_typed_data(fsa_dt_ha_msg); static time_t last_election_loss = 0; /* if the membership copy is NULL we REALLY shouldnt be voting * the question is how we managed to get here. */ CRM_CHECK(msg_data != NULL, return); CRM_CHECK(crm_peer_cache != NULL, return); CRM_CHECK(vote != NULL, crm_err("Bogus data from %s", msg_data->origin); return); CRM_CHECK(vote->msg != NULL, crm_err("Bogus data from %s", msg_data->origin); return); your_age.tv_sec = 0; your_age.tv_usec = 0; op = crm_element_value(vote->msg, F_CRM_TASK); vote_from = crm_element_value(vote->msg, F_CRM_HOST_FROM); your_version = crm_element_value(vote->msg, F_CRM_VERSION); election_owner = crm_element_value(vote->msg, F_CRM_ELECTION_OWNER); crm_element_value_int(vote->msg, F_CRM_ELECTION_ID, &election_id); crm_element_value_int(vote->msg, F_CRM_ELECTION_AGE_S, (int *)&(your_age.tv_sec)); crm_element_value_int(vote->msg, F_CRM_ELECTION_AGE_US, (int *)&(your_age.tv_usec)); CRM_CHECK(vote_from != NULL, vote_from = fsa_our_uname); your_node = crm_get_peer(0, vote_from); our_node = crm_get_peer(0, fsa_our_uname); if (voted == NULL) { crm_debug("Created voted hash"); voted = g_hash_table_new_full(crm_str_hash, g_str_equal, g_hash_destroy_str, g_hash_destroy_str); } if (is_heartbeat_cluster()) { use_born_on = TRUE; } else if (is_classic_ais_cluster()) { use_born_on = TRUE; } age = crm_compare_age(your_age); if (cur_state == S_STARTING) { reason = "Still starting"; we_loose = TRUE; } else if (our_node == NULL || crm_is_peer_active(our_node) == FALSE) { reason = "We are not part of the cluster"; log_level = LOG_ERR; we_loose = TRUE; } else if (election_id != current_election_id && crm_str_eq(fsa_our_uuid, election_owner, TRUE)) { log_level = LOG_DEBUG_2; reason = "Superceeded"; done = TRUE; } else if (your_node == NULL || crm_is_peer_active(your_node) == FALSE) { /* Possibly we cached the message in the FSA queue at a point that it wasn't */ reason = "Peer is not part of our cluster"; log_level = LOG_WARNING; done = TRUE; } else if (crm_str_eq(op, CRM_OP_NOVOTE, TRUE)) { char *op_copy = strdup(op); char *uname_copy = strdup(vote_from); CRM_ASSERT(crm_str_eq(fsa_our_uuid, election_owner, TRUE)); /* update the list of nodes that have voted */ g_hash_table_replace(voted, uname_copy, op_copy); reason = "Recorded"; done = TRUE; } else if (crm_str_eq(vote_from, fsa_our_uname, TRUE)) { char *op_copy = strdup(op); char *uname_copy = strdup(vote_from); CRM_ASSERT(crm_str_eq(fsa_our_uuid, election_owner, TRUE)); /* update ourselves in the list of nodes that have voted */ g_hash_table_replace(voted, uname_copy, op_copy); reason = "Recorded"; done = TRUE; } else if (compare_version(your_version, CRM_FEATURE_SET) < 0) { reason = "Version"; we_loose = TRUE; } else if (compare_version(your_version, CRM_FEATURE_SET) > 0) { reason = "Version"; } else if (age < 0) { reason = "Uptime"; we_loose = TRUE; } else if (age > 0) { reason = "Uptime"; /* TODO: Check for y(our) born < 0 */ } else if (use_born_on && your_node->born < our_node->born) { reason = "Born"; we_loose = TRUE; } else if (use_born_on && your_node->born > our_node->born) { reason = "Born"; } else if (fsa_our_uname == NULL) { reason = "Unknown host name"; we_loose = TRUE; } else if (strcasecmp(fsa_our_uname, vote_from) > 0) { reason = "Host name"; we_loose = TRUE; } else { reason = "Host name"; CRM_ASSERT(strcmp(fsa_our_uname, vote_from) != 0); /* cant happen... * } else if(strcasecmp(fsa_our_uname, vote_from) == 0) { * * default... * } else { // strcasecmp(fsa_our_uname, vote_from) < 0 * we win */ } if (done) { do_crm_log(log_level + 1, "Election %d (current: %d, owner: %s): Processed %s from %s (%s)", election_id, current_election_id, election_owner, op, vote_from, reason); } else if (we_loose) { xmlNode *novote = create_request(CRM_OP_NOVOTE, NULL, vote_from, CRM_SYSTEM_CRMD, CRM_SYSTEM_CRMD, NULL); do_crm_log(log_level, "Election %d (owner: %s) lost: %s from %s (%s)", election_id, election_owner, op, vote_from, reason); update_dc(NULL); crm_timer_stop(election_timeout); if (fsa_input_register & R_THE_DC) { crm_trace("Give up the DC to %s", vote_from); register_fsa_input(C_FSA_INTERNAL, I_RELEASE_DC, NULL); } else if (cur_state != S_STARTING) { crm_trace("We werent the DC anyway"); register_fsa_input(C_FSA_INTERNAL, I_PENDING, NULL); } crm_xml_add(novote, F_CRM_ELECTION_OWNER, election_owner); crm_xml_add_int(novote, F_CRM_ELECTION_ID, election_id); send_cluster_message(crm_get_peer(0, vote_from), crm_msg_crmd, novote, TRUE); free_xml(novote); fsa_cib_conn->cmds->set_slave(fsa_cib_conn, cib_scope_local); last_election_loss = time(NULL); } else { do_crm_log(log_level, "Election %d (owner: %s) pass: %s from %s (%s)", election_id, election_owner, op, vote_from, reason); if (last_election_loss) { time_t tm_now = time(NULL); if (tm_now - last_election_loss < (time_t) loss_dampen) { crm_info("Election %d ignore: We already lost an election less than %ds ago (%s)", election_id, loss_dampen, ctime(&last_election_loss)); update_dc(NULL); return; } last_election_loss = 0; } register_fsa_input(C_FSA_INTERNAL, I_ELECTION, NULL); g_hash_table_destroy(voted); voted = NULL; } }
/* A_ELECTION_COUNT */ enum election_result election_count_vote(election_t *e, xmlNode *vote, bool can_win) { int age = 0; int election_id = -1; int log_level = LOG_INFO; gboolean use_born_on = FALSE; gboolean done = FALSE; gboolean we_loose = FALSE; const char *op = NULL; const char *from = NULL; const char *reason = "unknown"; const char *election_owner = NULL; crm_node_t *our_node = NULL, *your_node = NULL; static int election_wins = 0; xmlNode *novote = NULL; time_t tm_now = time(NULL); static time_t expires = 0; static time_t last_election_loss = 0; /* if the membership copy is NULL we REALLY shouldn't be voting * the question is how we managed to get here. */ CRM_CHECK(vote != NULL, return election_error); if(e == NULL) { crm_info("Not voting in election: not initialized"); return election_lost; } else if(crm_peer_cache == NULL) { crm_info("Not voting in election: no peer cache"); return election_lost; } op = crm_element_value(vote, F_CRM_TASK); from = crm_element_value(vote, F_CRM_HOST_FROM); election_owner = crm_element_value(vote, F_CRM_ELECTION_OWNER); crm_element_value_int(vote, F_CRM_ELECTION_ID, &election_id); your_node = crm_get_peer(0, from); our_node = crm_get_peer(0, e->uname); if (e->voted == NULL) { crm_debug("Created voted hash"); e->voted = g_hash_table_new_full(crm_str_hash, g_str_equal, g_hash_destroy_str, g_hash_destroy_str); } if (is_heartbeat_cluster()) { use_born_on = TRUE; } else if (is_classic_ais_cluster()) { use_born_on = TRUE; } if(can_win == FALSE) { reason = "Not eligible"; we_loose = TRUE; } else if (our_node == NULL || crm_is_peer_active(our_node) == FALSE) { reason = "We are not part of the cluster"; log_level = LOG_ERR; we_loose = TRUE; } else if (election_id != e->count && crm_str_eq(our_node->uuid, election_owner, TRUE)) { log_level = LOG_TRACE; reason = "Superseded"; done = TRUE; } else if (your_node == NULL || crm_is_peer_active(your_node) == FALSE) { /* Possibly we cached the message in the FSA queue at a point that it wasn't */ reason = "Peer is not part of our cluster"; log_level = LOG_WARNING; done = TRUE; } else if (crm_str_eq(op, CRM_OP_NOVOTE, TRUE)) { char *op_copy = strdup(op); char *uname_copy = strdup(from); CRM_ASSERT(crm_str_eq(our_node->uuid, election_owner, TRUE)); /* update the list of nodes that have voted */ g_hash_table_replace(e->voted, uname_copy, op_copy); reason = "Recorded"; done = TRUE; } else { struct timeval your_age; const char *your_version = crm_element_value(vote, F_CRM_VERSION); int tv_sec = 0; int tv_usec = 0; crm_element_value_int(vote, F_CRM_ELECTION_AGE_S, &tv_sec); crm_element_value_int(vote, F_CRM_ELECTION_AGE_US, &tv_usec); your_age.tv_sec = tv_sec; your_age.tv_usec = tv_usec; age = crm_compare_age(your_age); if (crm_str_eq(from, e->uname, TRUE)) { char *op_copy = strdup(op); char *uname_copy = strdup(from); CRM_ASSERT(crm_str_eq(our_node->uuid, election_owner, TRUE)); /* update ourselves in the list of nodes that have voted */ g_hash_table_replace(e->voted, uname_copy, op_copy); reason = "Recorded"; done = TRUE; } else if (compare_version(your_version, CRM_FEATURE_SET) < 0) { reason = "Version"; we_loose = TRUE; } else if (compare_version(your_version, CRM_FEATURE_SET) > 0) { reason = "Version"; } else if (age < 0) { reason = "Uptime"; we_loose = TRUE; } else if (age > 0) { reason = "Uptime"; /* TODO: Check for y(our) born < 0 */ } else if (use_born_on && your_node->born < our_node->born) { reason = "Born"; we_loose = TRUE; } else if (use_born_on && your_node->born > our_node->born) { reason = "Born"; } else if (e->uname == NULL) { reason = "Unknown host name"; we_loose = TRUE; } else if (strcasecmp(e->uname, from) > 0) { reason = "Host name"; we_loose = TRUE; } else { reason = "Host name"; CRM_ASSERT(strcasecmp(e->uname, from) < 0); /* can't happen... * } else if(strcasecmp(e->uname, from) == 0) { * */ } } if (expires < tm_now) { election_wins = 0; expires = tm_now + STORM_INTERVAL; } else if (done == FALSE && we_loose == FALSE) { int peers = 1 + g_hash_table_size(crm_peer_cache); /* If every node has to vote down every other node, thats N*(N-1) total elections * Allow some leway before _really_ complaining */ election_wins++; if (election_wins > (peers * peers)) { crm_warn("Election storm detected: %d elections in %d seconds", election_wins, STORM_INTERVAL); election_wins = 0; expires = tm_now + STORM_INTERVAL; crm_write_blackbox(0, NULL); } } if (done) { do_crm_log(log_level + 1, "Election %d (current: %d, owner: %s): Processed %s from %s (%s)", election_id, e->count, election_owner, op, from, reason); return e->state; } else if(we_loose == FALSE) { do_crm_log(log_level, "Election %d (owner: %s) pass: %s from %s (%s)", election_id, election_owner, op, from, reason); if (last_election_loss == 0 || tm_now - last_election_loss > (time_t) loss_dampen) { last_election_loss = 0; election_timeout_stop(e); /* Start a new election by voting down this, and other, peers */ e->state = election_start; return e->state; } crm_info("Election %d ignore: We already lost an election less than %ds ago (%s)", election_id, loss_dampen, ctime(&last_election_loss)); } novote = create_request(CRM_OP_NOVOTE, NULL, from, CRM_SYSTEM_CRMD, CRM_SYSTEM_CRMD, NULL); do_crm_log(log_level, "Election %d (owner: %s) lost: %s from %s (%s)", election_id, election_owner, op, from, reason); election_timeout_stop(e); crm_xml_add(novote, F_CRM_ELECTION_OWNER, election_owner); crm_xml_add_int(novote, F_CRM_ELECTION_ID, election_id); send_cluster_message(your_node, crm_msg_crmd, novote, TRUE); free_xml(novote); last_election_loss = tm_now; e->state = election_lost; return e->state; }