Matching shard to crush bucket in erasure coding

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Hi
I'm working on a new erasure code, different than the one implemented
in ceph lrc plugin. I'm trying to understand how ceph lrc plugin
allocates shards in a layer, but it's not clear from the code.

For example, say I have a local group containing shards 0,1,2,5
While 0,1,2 are data and 5 is parity. I'd like to place all of these
shards in the same rack.

Where in lrc .cc code  these shards, which are composing a single
layer, are allocated to the same rack?

Thanks,
Oleg
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