Reserved Topics

Solace PubSub+ uses a number of reserved topics to implement some specific messaging features. Each of these topic subscriptions begin with the # character, which is then followed by a specific, reserved sequence of characters. Some special topics only use a reserved string for the first hierarchical level of the topic subscription, others may reserve more than one level.

Any topic starting with # is reserved for special topics. Topics defined by applications must not start with #. As an exception to this rule—with request/reply across multi-node routing networks, where a subscription propagation delay may occur—topics of the form #P2P/v:routerName/<something> can be used.

Topic Subscription	Published Topics That Match the Subscription	Description
`#LOG/...`	`#LOG/level/SYSTEM/hostName/event/Name` `#LOG/level/VPN/hostName/eventName/vpnName[/suffix]` `#LOG/level/CLIENT/hostName/eventName/vpnName/clientName` `#LOG/level/APPLICATION/hostName/eventName/vpnName[/suffix]` `#LOG/INFO/SUB_ADD/subscribedTopic` `#LOG/INFO/SUB_DEL/subscribedTopic`	Used by the event broker to publish events to the message bus. Published by: event broker Subscribed to by: management client applications
`#MCAST/>`	`#MCAST/CACHEMGR`	Used by PubSub+ Cache instances to broadcast initial messages to find their Cache Manager. Published by: PubSub+ Cache Instances Subscribed to by: event broker
`#noexport/#share/ShareName/topicFilter` `#noexport/topicFilter`	`#noexport/#share/ShareName/topicFilter` `#noexport/topicFilter`	Any subscription (shared or non-shared) that starts with `#noexport` is not advertised by the local node (through MNR/DMR) to other nodes in the network. This prevents published messages on those remote nodes from being attracted to the subscriber on the local node. If the subscription is qualified with `#noexport` then it only attracts messages published locally on the same broker where the subscriber is. It will not be advertised by MNR/DMR. An individual subscription can be flagged `#noexport`, even if the subscriptions of the message VPN as a whole are being exported. `#noexport/#share/ShareName/topicFilter` is used to specify a non-exported shared subscription, where `ShareName` is the shared subscription identifier, and `topicFilter` is the topic filter. `#noexport/topicFilter` allows applications to receive messages matching a `topicFilter` that are received by the node the client is connected to by not exporting the subscription to other nodes in a routed (DMR or MNR) network. `#noexport` applies only to subscriptions and is unsupported for cache requests. Published by: client applications Subscribed to by: client applications
`#P2P/CACHEINST/distibutedCacheName`	`#P2P/CACHEINST/distibutedCacheName`	Used to direct PubSub+ Cache requests to a distributed cache. Published by: client applications Subscribed to by: PubSub+ Cache Distributed Cache
`#P2P/CACHEINST/cacheClusterName`	`#P2P/CACHEINST/cacheClusterName`	Used to direct PubSub+ Cache requests to a cluster in a distributed cache. Published by: client applications Subscribed to by: PubSub+ Cache Cache Cluster
`#P2P/CACHEINST/cacheInstanceName`	`#P2P/CACHEINST/cacheInstanceName`	Used to direct PubSub+ Cache requests to a specific cache instance in a distributed cache. Published by: client applications Subscribed to by: PubSub+ Cache
`#P2P/routerName/clientUsernameHash/#client/>`	`#P2P/routerName/clientUsernameHash/#client/CACHEMGR` `#P2P/routerName/clientUsernameHash/#client/_CACHEMGR`	Used by PubSub+ Cache instances to communicate with their Cache Manager. Published by: PubSub+ Cache Subscribed to by: event broker
`#P2P/routerName/#client/>`	`#P2P/routerName/#client/CACHEMGR`	Used by PubSub+ Cache instances to communicate with their Cache Manager. Published by: PubSub+ Cache Instances Subscribed to by: event broker
`#P2P/v:routerName/clientUsernameHash/clientName/>`	`#P2P/v:routerName/clientUsernameHash/clientName/...`	Used for Direct Messaging request/reply. The name space is controlled by the client API, but the event broker sets the prefix. Published by: client applications Subscribed to by: client API
`#P2P/v:routerName/clientName/>`	`#P2P/v:routerName/clientName/...`	Used for Direct Messaging request/reply. The name space is controlled by the client API, but the event broker sets the prefix. This pattern is used by client connections in SolOS 8.2 and below. Published by: client applications Subscribed to by: client API
`#P2P/QUE/queueName`	`#P2P/QUE/queueName`	Subscriptions that allow clients to publish messages to and/or consume messages from the specified durable queues. Published by: client applications Subscribed to by: client applications
`#P2P/QTMP/v:routerName/queueName`	`#P2P/QTMP/v:routerName/queueName`	Subscriptions that allow clients to publish messages to and/or consume messages from the specified non-durable queues. The client App/Mgmt controls the name space, but the event broker sets the prefix. Published by: client applications Subscribed to by: client applications
`#P2P/TTMP/v:routerName/tempTopic`	`#P2P/TTMP/v:routerName/tempTopic`	Used for temporary topics. Name space is controlled by the client API, but the event broker sets the prefix. Published by: client applications Subscribed to by: client applications
`#P2P/v:routerName/>`	`#P2P/v:routerName/...`	Subscription created when a virtual router is discovered, to attract #P2P traffic for the event broker. This subscription is not visible in CLI. Published by: client applications Subscribed to by: event broker
`#P2P/routerName/>`	`#P2P/routerName/...`	Subscription always created when a physical event broker is discovered, to attract #P2P traffic for the event broker. This subscription is not visible in CLI. Published by: client applications Subscribed to by: event broker
`#SEMP/routerName/>`	`#SEMP/routerName/SHOW` `#SEMP/routerName//ADMIN/CLIENT` `#SEMP/routerName/ADMIN/DISTRIBUTED-CACHE`	Used to direct SEMP commands to a physical event broker name. Published by: client applications Subscribed to by: event broker
`#SEMP/v:routerName/>`	`#SEMP/v:routerName/SHOW` `#SEMP/v:routerName//ADMIN/CLIENT` `#SEMP/v:routerName/ADMIN/DISTRIBUTED-CACHE`	Used to direct SEMP commands to a virtual router name. Subscription is only present when a given event broker is active for the virtual router name. Published by: client applications Subscribed to by: event broker
`#share/ShareName/topicFilter`	`#share/ShareName/topicFilter`	A Direct Messaging feature to load balance data amongst clients. A shared subscription has the form: `#share/ShareName/topicFilter`, where `ShareName` is the shared subscription identifier, and `topicFilter` is the topic filter. Published by: client applications Subscribed to by: client applications
`#insights/...`	`#insights/pinger/ping`	Used to check inter-broker connectivity by PubSub+ Cloud. Published by: PubSub+ Insights client Subscribed to by: PubSub+ Insights client

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