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  1. Core Server
  2. SERVER-15674

Auto split of low top chunk does not move it to appropriate shard node

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    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • 2.8.0-rc3
    • Affects Version/s: 2.7.7
    • Component/s: Sharding
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      In a 4 node sharded cluster, configure as follows:

      • Pre-split collection such that it is imbalanced (set to a large number of chunks on the nodes that it will be moved from).
      • shard0 - low "top chunk "Tag "NYC" 10 chunks -infinity -> 0
      • shard1 - middle chunks Tag "SF" 10 chunks 0 -> 500
      • shard2 - high "top chunk" Tag "NYC" 2 chunks 1000 -> infinity
      • shard3 - middle chunks Tag "SF" 1 chunk 500 -> 1000

      Insert into low "top chunk" to create a new chunk
      The new low "top chunk" should be created and reside on shard2
      The previous low "top chunk" should still reside on shard0

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      In a 4 node sharded cluster, configure as follows: Pre-split collection such that it is imbalanced (set to a large number of chunks on the nodes that it will be moved from). shard0 - low "top chunk "Tag "NYC" 10 chunks -infinity -> 0 shard1 - middle chunks Tag "SF" 10 chunks 0 -> 500 shard2 - high "top chunk" Tag "NYC" 2 chunks 1000 -> infinity shard3 - middle chunks Tag "SF" 1 chunk 500 -> 1000 Insert into low "top chunk" to create a new chunk The new low "top chunk" should be created and reside on shard2 The previous low "top chunk" should still reside on shard0
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      "Top chunks" are the special chunks with MinKey or MaxKey in their range. A low "top chunk" is the chunk with the MinKey. When an auto split is required on a top chunk the auto split should perform the split and move the new top chunk to another node if required.

            Assignee:
            randolph@mongodb.com Randolph Tan
            Reporter:
            jonathan.abrahams Jonathan Abrahams (Inactive)
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              Created:
              Updated:
              Resolved: