[jboss-jira] [JBoss JIRA] (JGRP-1379) Make merging more scalable / robust

[Bela Ban (Created) (JIRA)]

Make merging more scalable / robust
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                 Key: JGRP-1379
                 URL: https://issues.jboss.org/browse/JGRP-1379
             Project: JGroups
          Issue Type: Task
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 3.1


Make the MERGE2/GMS/Merger code more robust and scale better in large clusters.
- While a merge is going on, stop sending out discovery requests. This reduces unnecessary traffic, especially in large clusters where discovery responses include the entire view of a sub-cluster
- If we start a merge, or receive a MERGE-REQUEST, start a timer which cancels the merge after <merge_timeout *2> milliseconds. This is similar to the MergeKiller code, and prevents stale merges, e.g. by a crashed merge leader
- Instead of cancelling a merge on reception of a MERGE_REJECTED response from P, simply exclude P from the merge. This way, we'll have fewer merge cancellations


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