Implication of using rados_ioctx_locator_set_key

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I'm curious about what performance implications there may be when using rados_ioctx_locator_set_key.

If a large number of objects are forced into a single PG using a fixed locator key, are there performance implications for subsequent look-ups by object name? Is some type of index structure used under the hood since the PG isn't chosen using locator_key = object_name?

-Noah--
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