Merge "Added information how to use JsonFilter"
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@ -22,7 +22,14 @@ from cinder.scheduler import filters
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class JsonFilter(filters.BaseBackendFilter):
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class JsonFilter(filters.BaseBackendFilter):
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"""Backend filter for simple JSON-based grammar for selecting backends."""
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"""Backend filter for simple JSON-based grammar for selecting backends.
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If you want to choose one of your backend,
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make a query hint, for example:
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cinder create --hint query='["=", "$backend_id", "rbd:vol@ceph#cloud"]'
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"""
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def _op_compare(self, args, op):
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def _op_compare(self, args, op):
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"""Compare first item of args with the rest using specified operator.
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"""Compare first item of args with the rest using specified operator.
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