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pacemaker.26927
bsc#1177212-0000-Low-libpe_status-handle-pendin...
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File bsc#1177212-0000-Low-libpe_status-handle-pending-migrations-correctly.patch of Package pacemaker.26927
From d22554288f7f04e09f5df1172a617b735617de37 Mon Sep 17 00:00:00 2001 From: Ken Gaillot <kgaillot@redhat.com> Date: Tue, 22 May 2018 11:00:22 -0500 Subject: [PATCH] Low: libpe_status: handle pending migrations correctly This is mainly a refactor of unpack_rsc_migration() for readability. The one significant change is that previously, a migrate_from operation that was *recorded* as pending (record-pending=true) was treated differently from an unrecorded pending migrate_from (record-pending=false). --- lib/pengine/unpack.c | 162 ++++++++++++++++++++++++------------------- 1 file changed, 91 insertions(+), 71 deletions(-) diff --git a/lib/pengine/unpack.c b/lib/pengine/unpack.c index b4ebf936e..85b0f684a 100644 --- a/lib/pengine/unpack.c +++ b/lib/pengine/unpack.c @@ -2281,94 +2281,114 @@ find_lrm_op(const char *resource, const char *op, const char *node, const char * return get_xpath_object(xpath, data_set->input, LOG_DEBUG); } +static bool +stop_happened_after(pe_resource_t *rsc, pe_node_t *node, xmlNode *xml_op, + pe_working_set_t *data_set) +{ + xmlNode *stop_op = find_lrm_op(rsc->id, CRMD_ACTION_STOP, node->details->id, + NULL, data_set); + + if (stop_op) { + int stop_id = 0; + int task_id = 0; + + crm_element_value_int(stop_op, XML_LRM_ATTR_CALLID, &stop_id); + crm_element_value_int(xml_op, XML_LRM_ATTR_CALLID, &task_id); + if (stop_id > task_id) { + return TRUE; + } + } + return FALSE; +} + static void unpack_rsc_migration(resource_t *rsc, node_t *node, xmlNode *xml_op, pe_working_set_t * data_set) { - - /* - * The normal sequence is (now): migrate_to(Src) -> migrate_from(Tgt) -> stop(Src) - * - * So if a migrate_to is followed by a stop, then we don't need to care what - * happened on the target node + /* A successful migration sequence is: + * migrate_to on source node + * migrate_from on target node + * stop on source node * - * Without the stop, we need to look for a successful migrate_from. - * This would also imply we're no longer running on the source + * If a migrate_to is followed by a stop, the entire migration (successful + * or failed) is complete, and we don't care what happened on the target. * - * Without the stop, and without a migrate_from op we make sure the resource - * gets stopped on both source and target (assuming the target is up) + * If no migrate_from has happened, the migration is considered to be + * "partial". If the migrate_from failed, make sure the resource gets + * stopped on both source and target (if up). * + * If the migrate_to and migrate_from both succeeded (which also implies the + * resource is no longer running on the source), but there is no stop, the + * migration is considered to be "dangling". */ - int stop_id = 0; - int task_id = 0; - xmlNode *stop_op = - find_lrm_op(rsc->id, CRMD_ACTION_STOP, node->details->id, NULL, data_set); - - if (stop_op) { - crm_element_value_int(stop_op, XML_LRM_ATTR_CALLID, &stop_id); + int from_rc = 0; + int from_status = 0; + const char *migrate_source = NULL; + const char *migrate_target = NULL; + pe_node_t *target = NULL; + pe_node_t *source = NULL; + xmlNode *migrate_from = NULL; + + if (stop_happened_after(rsc, node, xml_op, data_set)) { + return; } - crm_element_value_int(xml_op, XML_LRM_ATTR_CALLID, &task_id); + // Clones are not allowed to migrate, so role can't be master + rsc->role = RSC_ROLE_STARTED; - if (stop_op == NULL || stop_id < task_id) { - int from_rc = 0, from_status = 0; - const char *migrate_source = - crm_element_value(xml_op, XML_LRM_ATTR_MIGRATE_SOURCE); - const char *migrate_target = - crm_element_value(xml_op, XML_LRM_ATTR_MIGRATE_TARGET); + migrate_source = crm_element_value(xml_op, XML_LRM_ATTR_MIGRATE_SOURCE); + migrate_target = crm_element_value(xml_op, XML_LRM_ATTR_MIGRATE_TARGET); - node_t *target = pe_find_node(data_set->nodes, migrate_target); - node_t *source = pe_find_node(data_set->nodes, migrate_source); - xmlNode *migrate_from = - find_lrm_op(rsc->id, CRMD_ACTION_MIGRATED, migrate_target, migrate_source, - data_set); + target = pe_find_node(data_set->nodes, migrate_target); + source = pe_find_node(data_set->nodes, migrate_source); - rsc->role = RSC_ROLE_STARTED; /* can be master? */ - if (migrate_from) { - crm_element_value_int(migrate_from, XML_LRM_ATTR_RC, &from_rc); - crm_element_value_int(migrate_from, XML_LRM_ATTR_OPSTATUS, &from_status); - pe_rsc_trace(rsc, "%s op on %s exited with status=%d, rc=%d", - ID(migrate_from), migrate_target, from_status, from_rc); - } - - if (migrate_from && from_rc == PCMK_OCF_OK - && from_status == PCMK_LRM_OP_DONE) { - pe_rsc_trace(rsc, "Detected dangling migration op: %s on %s", ID(xml_op), - migrate_source); + // Check whether there was a migrate_from action + migrate_from = find_lrm_op(rsc->id, CRMD_ACTION_MIGRATED, migrate_target, + migrate_source, data_set); + if (migrate_from) { + crm_element_value_int(migrate_from, XML_LRM_ATTR_RC, &from_rc); + crm_element_value_int(migrate_from, XML_LRM_ATTR_OPSTATUS, &from_status); + pe_rsc_trace(rsc, "%s op on %s exited with status=%d, rc=%d", + ID(migrate_from), migrate_target, from_status, from_rc); + } - /* all good - * just need to arrange for the stop action to get sent - * but _without_ affecting the target somehow - */ - rsc->role = RSC_ROLE_STOPPED; - rsc->dangling_migrations = g_list_prepend(rsc->dangling_migrations, node); + if (migrate_from && from_rc == PCMK_OCF_OK + && from_status == PCMK_LRM_OP_DONE) { + /* The migrate_to and migrate_from both succeeded, so mark the migration + * as "dangling". This will be used to schedule a stop action on the + * source without affecting the target. + */ + pe_rsc_trace(rsc, "Detected dangling migration op: %s on %s", ID(xml_op), + migrate_source); + rsc->role = RSC_ROLE_STOPPED; + rsc->dangling_migrations = g_list_prepend(rsc->dangling_migrations, node); - } else if (migrate_from) { /* Failed */ - if (target && target->details->online) { - pe_rsc_trace(rsc, "Marking active on %s %p %d", migrate_target, target, - target->details->online); - native_add_running(rsc, target, data_set); - } + } else if (migrate_from && (from_status != PCMK_LRM_OP_PENDING)) { // Failed + if (target && target->details->online) { + pe_rsc_trace(rsc, "Marking active on %s %p %d", migrate_target, target, + target->details->online); + native_add_running(rsc, target, data_set); + } - } else { /* Pending or complete but erased */ - if (target && target->details->online) { - pe_rsc_trace(rsc, "Marking active on %s %p %d", migrate_target, target, - target->details->online); + } else { // Pending, or complete but erased + if (target && target->details->online) { + pe_rsc_trace(rsc, "Marking active on %s %p %d", migrate_target, target, + target->details->online); - native_add_running(rsc, target, data_set); - if (source && source->details->online) { - /* If we make it here we have a partial migration. The migrate_to - * has completed but the migrate_from on the target has not. Hold on - * to the target and source on the resource. Later on if we detect that - * the resource is still going to run on that target, we may continue - * the migration */ - rsc->partial_migration_target = target; - rsc->partial_migration_source = source; - } - } else { - /* Consider it failed here - forces a restart, prevents migration */ - set_bit(rsc->flags, pe_rsc_failed); - clear_bit(rsc->flags, pe_rsc_allow_migrate); + native_add_running(rsc, target, data_set); + if (source && source->details->online) { + /* This is a partial migration: the migrate_to completed + * successfully on the source, but the migrate_from has not + * completed. Remember the source and target; if the newly + * chosen target remains the same when we schedule actions + * later, we may continue with the migration. + */ + rsc->partial_migration_target = target; + rsc->partial_migration_source = source; } + } else { + /* Consider it failed here - forces a restart, prevents migration */ + set_bit(rsc->flags, pe_rsc_failed); + clear_bit(rsc->flags, pe_rsc_allow_migrate); } } } -- 2.26.2
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