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Described in https://github.com/etcd-io/etcd/issues/10877. "black-height" property: Every path from a node to any descendant leaf node must have the same number of black nodes. Expected After deleting 11 (requires rebalancing): [510,511] / \ ---------- -------------------------- / \ [383,384] [830,831] / \ / \ / \ / \ [261,262](red) [410,411] [647,648] [899,900](red) / \ \ / \ / \ \ / \ [82,83] [292,293] [815,816](red) [888,889] [972,973] \ / \ / [238,239](red) [953,954](red) Got After deleting 11 (requires rebalancing): [510,511] / \ ---------- -------------------------- / \ [82,83] [830,831] \ / \ \ / \ [383,384] [647,648] [899,900] / \ \ / \ / \ \ / \ [261,262] [410,411] [815,816] [888,889] [972,973] / \ / / \ / [238,239] [292,293] [953,954] This violates "black-height" property. Signed-off-by: Gyuho Lee <leegyuho@amazon.com>
pkg/ is a collection of utility packages used by etcd without being specific to etcd itself. A package belongs here only if it could possibly be moved out into its own repository in the future.