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  1. Couchbase Server
  2. MB-5545

Rebalance Inefficiency increasing the number of vbuckets on a node that should be decreasing

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: 1.8.0
    • Fix Version/s: feature-backlog
    • Component/s: ns_server
    • Security Level: Public
    • Labels:

      Description

      I noticed the problem at a customer today and reproduced it myself on 1.8.1.

      Take a 6 node cluster, add 12 more but stop rebalance almost right away (moving only a few vbuckets). Let things stabilize and restart the rebalance. If you watch the vbucket movement on all of the nodes, you'll see at least one of the original 6 nodes actually start to increase its vbucket count. And then it starts to go down as expected.

      I reproduced this with a completely empty cluster (one bucket). But it makes a much bigger deal in a customers environment when we're trying to grow the cluster...and now vbuckets are going back on nodes that are already under pressure.

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        Activity

        Hide
        perry Perry Krug added a comment -

        Dupe mb-6511

        Show
        perry Perry Krug added a comment - Dupe mb-6511
        Hide
        maria Maria McDuff (Inactive) added a comment -

        Dupe.

        Show
        maria Maria McDuff (Inactive) added a comment - Dupe.

          People

          • Assignee:
            alkondratenko Aleksey Kondratenko (Inactive)
            Reporter:
            perry Perry Krug
          • Votes:
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            Watchers:
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            Dates

            • Created:
              Updated:
              Resolved:

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