34.3. Split Brain Timing: Recovering From a Split

After a split occurs JBoss Data Grid will merge the partitions back, and the maximum time to detect a merge after the network partition is healed is:
3.1 * MERGE3.max_interval
In some cases multiple merges will occur after a split so that the cluster may contain all available partitions. In this case, where multiple merges occur, time should be allowed for all of these to complete, and as there may be as many as three merges occurring sequentially the total delay should be no more than the following:
10 * MERGE3.max_interval

Important

The amount of time taken in the formulas above is how long it takes JBoss Data Grid to install a cluster view without the leavers; however, as JBoss Data Grid runs inside a JVM excessive Garbage Collection (GC) times can increase this time beyond the failure detection outlined above. JBoss Data Grid has no control over these GC times, and excessive GC on the coordinator can delay this detection by an amount equal to the GC time.
In addition, when merging cluster views JBoss Data Grid tries to confirm all members are present; however, there is no upper bound on waiting for these responses, and merging the cluster views may be delayed due to networking issues.