diff --git a/daemons/fenced/fenced_history.c b/daemons/fenced/fenced_history.c index 1524fee5dc..1941755a1c 100644 --- a/daemons/fenced/fenced_history.c +++ b/daemons/fenced/fenced_history.c @@ -1,492 +1,520 @@ /* * Copyright 2009-2020 the Pacemaker project contributors * * The version control history for this file may have further details. * * This source code is licensed under the GNU General Public License version 2 * or later (GPLv2+) WITHOUT ANY WARRANTY. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MAX_STONITH_HISTORY 500 /*! * \internal * \brief Send a broadcast to all nodes to trigger cleanup or * history synchronisation * * \param[in] history Optional history to be attached * \param[in] callopts We control cleanup via a flag in the callopts * \param[in] target Cleanup can be limited to certain fence-targets */ static void stonith_send_broadcast_history(xmlNode *history, int callopts, const char *target) { xmlNode *bcast = create_xml_node(NULL, "stonith_command"); xmlNode *data = create_xml_node(NULL, __func__); if (target) { crm_xml_add(data, F_STONITH_TARGET, target); } crm_xml_add(bcast, F_TYPE, T_STONITH_NG); crm_xml_add(bcast, F_SUBTYPE, "broadcast"); crm_xml_add(bcast, F_STONITH_OPERATION, STONITH_OP_FENCE_HISTORY); crm_xml_add_int(bcast, F_STONITH_CALLOPTS, callopts); if (history) { add_node_copy(data, history); } add_message_xml(bcast, F_STONITH_CALLDATA, data); send_cluster_message(NULL, crm_msg_stonith_ng, bcast, FALSE); free_xml(data); free_xml(bcast); } static gboolean stonith_remove_history_entry (gpointer key, gpointer value, gpointer user_data) { remote_fencing_op_t *op = value; const char *target = (const char *) user_data; if ((op->state == st_failed) || (op->state == st_done)) { if ((target) && (strcmp(op->target, target) != 0)) { return FALSE; } return TRUE; } return FALSE; /* don't clean pending operations */ } /*! * \internal * \brief Send out a cleanup broadcast or do a local history-cleanup * * \param[in] target Cleanup can be limited to certain fence-targets * \param[in] broadcast Send out a cleanup broadcast */ static void stonith_fence_history_cleanup(const char *target, gboolean broadcast) { if (broadcast) { stonith_send_broadcast_history(NULL, st_opt_cleanup | st_opt_discard_reply, target); /* we'll do the local clean when we receive back our own broadcast */ } else if (stonith_remote_op_list) { g_hash_table_foreach_remove(stonith_remote_op_list, stonith_remove_history_entry, (gpointer) target); do_stonith_notify(0, T_STONITH_NOTIFY_HISTORY, 0, NULL); } } /* keeping the length of fence-history within bounds * ================================================= * * If things are really running wild a lot of fencing-attempts * might fill up the hash-map, eventually using up a lot * of memory and creating huge history-sync messages. * Before the history being synced across nodes at least * the reboot of a cluster-node helped keeping the * history within bounds even though not in a reliable * manner. * * stonith_remote_op_list isn't sorted for time-stamps * thus it would be kind of expensive to delete e.g. * the oldest entry if it would grow past MAX_STONITH_HISTORY * entries. * It is more efficient to purge MAX_STONITH_HISTORY/2 * entries whenever the list grows beyond MAX_STONITH_HISTORY. * (sort for age + purge the MAX_STONITH_HISTORY/2 oldest) * That done on a per-node-base might raise the * probability of large syncs to occur. * Things like introducing a broadcast to purge * MAX_STONITH_HISTORY/2 entries or not sync above a certain * threshold coming to mind ... * Simplest thing though is to purge the full history * throughout the cluster once MAX_STONITH_HISTORY is reached. * On the other hand this leads to purging the history in * situations where it would be handy to have it probably. */ static int op_time_sort(const void *a_voidp, const void *b_voidp) { const remote_fencing_op_t **a = (const remote_fencing_op_t **) a_voidp; const remote_fencing_op_t **b = (const remote_fencing_op_t **) b_voidp; gboolean a_pending = ((*a)->state != st_failed) && ((*a)->state != st_done); gboolean b_pending = ((*b)->state != st_failed) && ((*b)->state != st_done); if (a_pending && b_pending) { return 0; } else if (a_pending) { return -1; } else if (b_pending) { return 1; } else if ((*b)->completed == (*a)->completed) { return 0; } else if ((*b)->completed > (*a)->completed) { return 1; } return -1; } /*! * \internal * \brief Do a local history-trim to MAX_STONITH_HISTORY / 2 entries * once over MAX_STONITH_HISTORY */ void stonith_fence_history_trim(void) { guint num_ops; if (!stonith_remote_op_list) { return; } num_ops = g_hash_table_size(stonith_remote_op_list); if (num_ops > MAX_STONITH_HISTORY) { remote_fencing_op_t *ops[num_ops]; remote_fencing_op_t *op = NULL; GHashTableIter iter; int i; crm_trace("Fencing History growing beyond limit of %d so purge " "half of failed/successful attempts", MAX_STONITH_HISTORY); /* write all ops into an array */ i = 0; g_hash_table_iter_init(&iter, stonith_remote_op_list); while (g_hash_table_iter_next(&iter, NULL, (void **)&op)) { ops[i++] = op; } /* run quicksort over the array so that we get pending ops * first and then sorted most recent to oldest */ qsort(ops, num_ops, sizeof(remote_fencing_op_t *), op_time_sort); /* purgest oldest half of the history entries */ for (i = MAX_STONITH_HISTORY / 2; i < num_ops; i++) { /* keep pending ops even if they shouldn't fill more than * half of our buffer */ if ((ops[i]->state == st_failed) || (ops[i]->state == st_done)) { g_hash_table_remove(stonith_remote_op_list, ops[i]->id); } } /* we've just purged valid data from the list so there is no need * to create a notification - if displayed it can stay */ } } /*! * \internal * \brief Convert xml fence-history to a hash-table like stonith_remote_op_list * * \param[in] history Fence-history in xml * * \return Fence-history as hash-table */ static GHashTable * stonith_xml_history_to_list(xmlNode *history) { xmlNode *xml_op = NULL; GHashTable *rv = NULL; init_stonith_remote_op_hash_table(&rv); CRM_LOG_ASSERT(rv != NULL); for (xml_op = pcmk__xml_first_child(history); xml_op != NULL; xml_op = pcmk__xml_next(xml_op)) { remote_fencing_op_t *op = NULL; char *id = crm_element_value_copy(xml_op, F_STONITH_REMOTE_OP_ID); int state; long long completed; if (!id) { crm_warn("Malformed fencing history received from peer"); continue; } crm_trace("Attaching op %s to hashtable", id); op = calloc(1, sizeof(remote_fencing_op_t)); op->id = id; op->target = crm_element_value_copy(xml_op, F_STONITH_TARGET); op->action = crm_element_value_copy(xml_op, F_STONITH_ACTION); op->originator = crm_element_value_copy(xml_op, F_STONITH_ORIGIN); op->delegate = crm_element_value_copy(xml_op, F_STONITH_DELEGATE); op->client_name = crm_element_value_copy(xml_op, F_STONITH_CLIENTNAME); crm_element_value_ll(xml_op, F_STONITH_DATE, &completed); op->completed = (time_t) completed; crm_element_value_int(xml_op, F_STONITH_STATE, &state); op->state = (enum op_state) state; g_hash_table_replace(rv, id, op); CRM_LOG_ASSERT(g_hash_table_lookup(rv, id) != NULL); } return rv; } /*! * \internal * \brief Craft xml difference between local fence-history and a history * coming from remote * * \param[in] remote_history Fence-history as hash-table (may be NULL) * \param[in] add_id If crafting the answer for an API * history-request there is no need for the id * \param[in] target Optionally limit to certain fence-target * * \return The fence-history as xml */ static xmlNode * stonith_local_history_diff(GHashTable *remote_history, gboolean add_id, const char *target) { xmlNode *history = NULL; int cnt = 0; if (stonith_remote_op_list) { GHashTableIter iter; remote_fencing_op_t *op = NULL; history = create_xml_node(NULL, F_STONITH_HISTORY_LIST); g_hash_table_iter_init(&iter, stonith_remote_op_list); while (g_hash_table_iter_next(&iter, NULL, (void **)&op)) { xmlNode *entry = NULL; - if (remote_history && - g_hash_table_lookup(remote_history, op->id)) { - continue; /* skip entries broadcasted already */ + if (remote_history) { + remote_fencing_op_t *remote_op = + g_hash_table_lookup(remote_history, op->id); + + if (remote_op) { + if (remote_op->state != st_failed + && remote_op->state != st_done + && (op->state == st_failed + || op->state == st_done)) { + + crm_debug("Broadcasting operation %.8s (state=%s) to " + "update the outdated pending one " + "(state=%s) in remote peer history", + op->id, stonith_op_state_str(op->state), + stonith_op_state_str(remote_op->state)); + + } else { + continue; /* skip entries broadcasted already */ + } + } } if (!pcmk__str_eq(target, op->target, pcmk__str_null_matches)) { continue; } cnt++; crm_trace("Attaching op %s", op->id); entry = create_xml_node(history, STONITH_OP_EXEC); if (add_id) { crm_xml_add(entry, F_STONITH_REMOTE_OP_ID, op->id); } crm_xml_add(entry, F_STONITH_TARGET, op->target); crm_xml_add(entry, F_STONITH_ACTION, op->action); crm_xml_add(entry, F_STONITH_ORIGIN, op->originator); crm_xml_add(entry, F_STONITH_DELEGATE, op->delegate); crm_xml_add(entry, F_STONITH_CLIENTNAME, op->client_name); crm_xml_add_ll(entry, F_STONITH_DATE, op->completed); crm_xml_add_int(entry, F_STONITH_STATE, op->state); } } if (cnt == 0) { free_xml(history); return NULL; } else { return history; } } /*! * \internal * \brief Merge fence-history coming from remote into local history * * \param[in] history Hash-table holding remote history to be merged in */ static void stonith_merge_in_history_list(GHashTable *history) { GHashTableIter iter; remote_fencing_op_t *op = NULL; gboolean updated = FALSE; if (!history) { return; } init_stonith_remote_op_hash_table(&stonith_remote_op_list); g_hash_table_iter_init(&iter, history); while (g_hash_table_iter_next(&iter, NULL, (void **)&op)) { remote_fencing_op_t *stored_op = g_hash_table_lookup(stonith_remote_op_list, op->id); if (stored_op) { - continue; // Skip existent (@TODO state-merging might be desirable) + if (stored_op->state != st_failed + && stored_op->state != st_done + && (op->state == st_failed || op->state == st_done)) { + crm_debug("Updating outdated pending operation %.8s " + "(state=%s) according to the one (state=%s) from " + "remote peer history", + op->id, stonith_op_state_str(stored_op->state), + stonith_op_state_str(op->state)); + + } else { + continue; // Skip existent + } } updated = TRUE; g_hash_table_iter_steal(&iter); if ((op->state != st_failed) && (op->state != st_done) && pcmk__str_eq(op->originator, stonith_our_uname, pcmk__str_casei)) { crm_warn("Failing pending operation %.8s originated by us but " "known only from peer history", op->id); op->state = st_failed; op->completed = time(NULL); /* use -EHOSTUNREACH to not introduce a new return-code that might trigger unexpected results at other places and to prevent remote_op_done from setting the delegate if not present */ stonith_bcast_result_to_peers(op, -EHOSTUNREACH, FALSE); } g_hash_table_insert(stonith_remote_op_list, op->id, op); /* we could trim the history here but if we bail * out after trim we might miss more recent entries * of those that might still be in the list * if we don't bail out trimming once is more * efficient and memory overhead is minimal as * we are just moving pointers from one hash to * another */ } stonith_fence_history_trim(); if (updated) { do_stonith_notify(0, T_STONITH_NOTIFY_HISTORY, 0, NULL); } g_hash_table_destroy(history); /* remove what is left */ } /*! * \internal * \brief Handle fence-history messages (either from API or coming in as * broadcasts * * \param[in] msg Request message * \param[in] output In case of a request from the API used to craft * a reply from * \param[in] remote_peer * \param[in] options call-options from the request * * \return always success as there is actully nothing that can go really wrong */ int stonith_fence_history(xmlNode *msg, xmlNode **output, const char *remote_peer, int options) { int rc = 0; const char *target = NULL; xmlNode *dev = get_xpath_object("//@" F_STONITH_TARGET, msg, LOG_NEVER); xmlNode *out_history = NULL; if (dev) { target = crm_element_value(dev, F_STONITH_TARGET); if (target && (options & st_opt_cs_nodeid)) { int nodeid = crm_atoi(target, NULL); crm_node_t *node = pcmk__search_known_node_cache(nodeid, NULL, CRM_GET_PEER_ANY); if (node) { target = node->uname; } } } if (options & st_opt_cleanup) { crm_trace("Cleaning up operations on %s in %p", target, stonith_remote_op_list); stonith_fence_history_cleanup(target, crm_element_value(msg, F_STONITH_CALLID) != NULL); } else if (options & st_opt_broadcast) { /* there is no clear sign atm for when a history sync is done so send a notification for anything that smells like history-sync */ do_stonith_notify(0, T_STONITH_NOTIFY_HISTORY_SYNCED, 0, NULL); if (crm_element_value(msg, F_STONITH_CALLID)) { /* this is coming from the stonith-API * * craft a broadcast with node's history * so that every node can merge and broadcast * what it has on top */ out_history = stonith_local_history_diff(NULL, TRUE, NULL); crm_trace("Broadcasting history to peers"); stonith_send_broadcast_history(out_history, st_opt_broadcast | st_opt_discard_reply, NULL); } else if (remote_peer && !pcmk__str_eq(remote_peer, stonith_our_uname, pcmk__str_casei)) { xmlNode *history = get_xpath_object("//" F_STONITH_HISTORY_LIST, msg, LOG_NEVER); GHashTable *received_history = history?stonith_xml_history_to_list(history):NULL; /* either a broadcast created directly upon stonith-API request * or a diff as response to such a thing * * in both cases it may have a history or not * if we have differential data * merge in what we've received and stop * otherwise broadcast what we have on top * marking as differential and merge in afterwards */ if (!history || !crm_is_true(crm_element_value(history, F_STONITH_DIFFERENTIAL))) { out_history = stonith_local_history_diff(received_history, TRUE, NULL); if (out_history) { crm_trace("Broadcasting history-diff to peers"); crm_xml_add(out_history, F_STONITH_DIFFERENTIAL, XML_BOOLEAN_TRUE); stonith_send_broadcast_history(out_history, st_opt_broadcast | st_opt_discard_reply, NULL); } else { crm_trace("History-diff is empty - skip broadcast"); } } stonith_merge_in_history_list(received_history); } else { crm_trace("Skipping history-query-broadcast (%s%s)" " we sent ourselves", remote_peer?"remote-peer=":"local-ipc", remote_peer?remote_peer:""); } } else { /* plain history request */ crm_trace("Looking for operations on %s in %p", target, stonith_remote_op_list); *output = stonith_local_history_diff(NULL, FALSE, target); } free_xml(out_history); return rc; }