mnesia_cluster

This project contains the Mnesia layer found in RabbitMQ, adapted to be used in an application agnostic way within other OTP Applications or Releases.

Configuration

table_definition_mod

Defines the MFA that returns your Mnesia Table Definitions. The Definitions must have the following format:

[
{my_table,
  [
    {record_name, my_table_item},
    {attributes, record_info(fields, my_table_item)},
    {disc_copies, [node()]},
    {match, #my_table_item{_='_'}}
  ]
},
{my_other_table,
  [...]
}
...
].

The match property specifies a MatchHead similar to the one used in ETS and Mnesia MatchSpecs which is used for DB consistency checks during node startup.

app_process

Specifies a name of a Process that should run on every cluster node. Your app can specify callbacks that get the Nodename where this process starts, dies, or recovers. See the next section cluster_monitor_callbacks.

cluster_monitor_callbacks

Specifies a list of modules that are called in case the Process specified in app_process dies and recovers. The modules have to implement and export the on_node_up/1, and on_node_down/1 functions. The Nodename is the single argument provided to the callbacks.

cluster_nodes

Enables the auto configuration of a cluster during node startup

{TryNodes, NodeType}

TryNodes defines the Nodes that are subsequently tried during clustering. As soon as a node is reachable this process stops. NodeType can either be ram or discand specifies if this node connects as a mnesia ram or disc node.

cluster_partition_handling

Specifies how the node should react in case of a cluster partition. Three options exist:

• ignore: is obvious, we don't care.
• pause_minority: if the node belongs to the minor partition it stops the mnesia_cluster and mnesia applications. Once the partition is resolved the applications are automatically restarted.
• autoheal: an elected leader takes over control

Copyright

Copyright (c) 2014 Erlio GmbH All rights reserved.

The initial Developer of the Original Code is GoPivotal, Inc.