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25.5. Merging (MERGE2)
When a network error occurs, the cluster might be partitioned into several different partitions. JGroups has a MERGE service that allows the coordinators in partitions to communicate with each other and form a single cluster back again. The merging service is configured in the
MERGE2
sub-element under the JGroups Config
element. Here is an example configuration.
<MERGE2 max_interval="10000" min_interval="2000"/>
The configurable attributes in the
MERGE2
element are as follows.
- max_interval specifies the maximum number of milliseconds to wait before sending a MERGE message.
- min_interval specifies the minimum number of milliseconds to wait before sending a MERGE message.
JGroups chooses a random value between
min_interval
and max_interval
to periodically send the MERGE message.
Note
The application state maintained by the application using a channel is not merged by JGroups during a merge. This must be done by the application.
Note
If
MERGE2
is used in conjunction with TCPPING
, the initial_hosts
attribute must contain all the nodes that could potentially be merged back, in order for the merge process to work properly. Otherwise, the merge process may not detect all sub-groups, and may miss those comprised solely of unlisted members.