scheduler: Add weighers for same shard (live-)migration #455
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We want to prefer staying in the same shard on live-migration and on offline migration, because migrating VMs with volumes attached induces overhead. Therefore, we add `PreferSameShardOnLiveMigrateWeigher` and `PreferSameShardOnMigrateWeigher`. Since we already had that functionality available for resizes through `PreferSameShardOnResizeWeigher`, we refactored the weigher into a base class configured by class attribute `_TYPE`. Change-Id: I0d28b675562ec220163b8a159802c2126280c272
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We want to prefer staying in the same shard on live-migration and on offline migration, because migrating VMs with volumes attached induces overhead. Therefore, we add
PreferSameShardOnLiveMigrateWeigherandPreferSameShardOnMigrateWeigher.Since we already had that functionality available for resizes through
PreferSameShardOnResizeWeigher, we refactored the weigher into a base class configured by class attribute_TYPE.Change-Id: I0d28b675562ec220163b8a159802c2126280c272