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Eliah RusinandClaude Opus 5.5
2a42d56437
* ecbalancer: honour total-shards-per-rack cap in Place / PlaceDurabilityFirst
Worker auto-EC encode places via Topology.Place, which capped each shard
type independently (ceil(data/racks), ceil(parity/racks)). On an 8-rack
topology that permits 3 total shards on one rack, so losing two racks
strands 6/14 and a 10+4 volume becomes unreadable.
- tryPlace caps the total shards (data + parity) per rack in both modes,
whether or not ReplicaPlacement is set.
- rackTotalCap picks the smallest per-rack total the racks' real room
(free slots, bounded by the per-disk cap and node free slots, counting
shards already placed) can satisfy. On a uniform cluster it is
ceil(shards/racks); a nearly full rack raises it just enough that the
cap alone never fails an encode.
- PlaceDurabilityFirst gets a last rung that drops the rack cap
("rack-total-cap" in Relaxed), so it fails only when no disk has room.
PlaceStrict keeps the cap as a hard limit.
- chooseShardDest tries the next rack when the chosen one has no node
that fits, and room checks count the per-disk cap, so a rack whose
disks are all at the cap is no longer picked and then failed on
(pre-existing: 3-node rack + single-disk rack failed at shard 9).
- Docs no longer claim the cap guarantees surviving rack loss; the
placement error names the caps in effect; the encode warning no longer
says replica placement when other constraints were relaxed.
place_rack_cap_test.go covers 10+4 over 8 racks (max 2/rack, 3/rack on
master), a starved rack, nearly full racks, the preferred-tag tier, the
full-disk rack, and rackTotalCap directly.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
* ecbalancer: size the rack total cap from room left under SameRackCount
The rack total cap counted each rack's free disk room, but attempts that
enforce ReplicaPlacement also stop a node at SameRackCount shards. With
SameRackCount=1, four one-node racks and four three-node racks got cap 2,
which fits only 12 of 14 shards: strict placement failed and
durability-first relaxed replica placement although 1 per small rack and
up to 3 per large rack fits.
Attempts that enforce ReplicaPlacement now use a cap sized from each
node's remaining SameRackCount allowance; attempts that relax it keep the
disk-room cap.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>