Matthew Oliver c4e00eb89f Sharder: Fall back to local device in get_shard_broker ...

If the sharder is processing a node that has 0 weight, especially for
all the devices on the node, the `find_local_handoff_for_part` can
fail because there will be no local hand off devices available as it
uses the replica2part2dev_id to find a device.  However, a 0 weighted
device won't appear in the replica2part2dev table.

This patch extends `find_local_handoff_for_part`, if it fails to find
a node from the ring it'll fall back to a local device identified by
the `_local_device_ids` that is built up when the replicator or
sharder was identifing local devices. This uses the ring.devs, so does
include 0 weighted devices.  This allows the sharder to find a
location to write the shard_broker in a handoff location while
sharding.

Co-Authored-By: Tim Burke <tim.burke@gmail.com>
Change-Id: Ic38698e9ca0397770c7362229baef1101a72788f

2022-07-29 15:02:26 +01:00

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