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  1. JGroups
  2. JGRP-1379

Make merging more scalable / robust

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    • Task
    • Status: Resolved (View Workflow)
    • Major
    • Resolution: Done
    • None
    • 3.0
    • None

    Description

      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
      • If we have merge participants A,B,C,D,E but A only receives merge responses from itself, B and D, then don't cancel the merge, but instead proceed with merging A, B and D. This is currently not done, but a merge is cancelled when we don't get responses from every participant.

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                Updated:
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