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Other configuration formats are open for discussion throughout the IEP finalization.

Keys order restriction

Both HOCON and JSON formats don't preserve keys order when parsed, it's a part of the specification. So it's proposed to have extra syntax for elements that require strict order:

// Default syntax.
root.namedList {
  key1 { value = val1 },
  key2 { value = val2 }
}
// Specific syntax for when order must be preserved.
root.namedList = [
  { elementName = key1, value = val1 },
  { elementName = key2, value = val2 }
]

Global and local properties

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Global and local properties are naturally stored in different configuration trees, for example cluster and node respectively:

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node.rebalance.threads = 4

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