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abcc68dbe7
If tablet split is finalized while retrieving stats, the saved erm, used by all shards, will be invalidated. It can either cause incorrect behavior or crash if id is not available. It's worked by feeding local tablet map into the "coordinator" collecting stats from all shards. We will also no longer have a snapshot of erm shared between shards to help intra-node migration. This is simplified by serializing token metadata changes and the retrieval of the stats (latter should complete pretty fast, so it shouldn't block the former for any significant time). Fixes #18085. Signed-off-by: Raphael S. Carvalho <raphaelsc@scylladb.com>