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  1. Core Server
  2. SERVER-100785

Fatal crash of mongodb config server after issuing malformed reshardCollection command

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    • Cluster Scalability
    • Fully Compatible
    • ALL
    • v8.0
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      I set up a reproducer repository: https://github.com/luca-nardelli/mongodb-config-server-crash-reproducer

      Please make sure to wait for the resharding operation to get to the commit stage, that's when the config server crashses.

      Show
      I set up a reproducer repository: https://github.com/luca-nardelli/mongodb-config-server-crash-reproducer Please make sure to wait for the resharding operation to get to the commit stage, that's when the config server crashses.
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      When issuing a reshardCollection command with `zones`, and when these zones are malformed, the resharding never completes and the config server starts crashing after reaching the "commit" stage.

      Example of a malformed reshardCollection command

      db.adminCommand(
  {
  reshardCollection: 'test.test',
  key: {field: 1},
  forceRedistribution: true,
  zones: [
    {
      zone: 'shard-0',
      min: { field: 'MinKey' },
      max: {
        field: '0x8888888888888888888888888888888888888888'
      }
    },
    {
      zone: 'shard-1',
      min: {
        field: '0x8888888888888888888888888888888888888888'
      },
      max: { field: 'MaxKey' }
    }
  ]
}
)

      Note that MinKey and MaxKey are strings and not instances of MinKey() or MaxKey(). In my case, this happened because I was generating the zones array via a script.

            Assignee:
            randolph@mongodb.com Randolph Tan
            Reporter:
            lucanardelli91@gmail.com Luca Nardelli
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