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  1. Couchbase Server
  2. MB-25666

vbucket mapping algorithm is incorrect if num vbucket is not power of 2

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Details

    • Bug
    • Resolution: Unresolved
    • Minor
    • bug-backlog
    • 5.0.0
    • ns_server
    • None
    • Untriaged
    • No

    Description

      Trivial bug. ns_server uses a bitmask rather than the modulo:

      https://github.com/couchbase/ns_server/blob/22dd0b865aada27dfc2529f70af15a235e10ee55/src/cb_util.erl#L38

      This means that ns_server uses the wrong vbucket for a key if the number of vbuckets is not a power of 2.

      Index = Hashed band (NumVBuckets - 1),

      should be 

      Index = Hashed rem NumVBuckets,

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MB-19520 couchbase-cli pump rehash only works for powers of two number of vbuckets

          • Major - Major loss of function.
          • Closed
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              dfinlay Dave Finlay
              will.gardner Will Gardner (Inactive)
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              Dates

                Created:
                Updated:

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