Every method of builds, build requests, rollouts, merges and assignments reads and writes the chain alone: the else branches that read the tables, the movers and MoveChain with their tests, chain_moved reads, ChainReads and the flags that switched a kind, the store's assignments mirror (KeepAssignmentPlans needs none of it: it uses only the AssignmentMirrored type, mirrors.go, and AssignmentValues, provisioning.go) and its tick, the move code of the controller's start, and ForTest's chain_moved row. The listed store tests of the move go with their functions; the tests of the readers, requests, assignments and plans that lived beside them stay in chain_store_test.go. Tests that replayed old data migrations over the build, assignment and pin tables are removed with the tables. The static test that no plan is written but through SavePlansMoving now reads the plan's chain path.
Once chain_moved records the kind, Assign, Unassign and Assigned write and read the keys <node>.<module>, and every join of the store that read assignments is made from the bucket: where a module runs, what is behind, what a machine awaits, a given value due for replacement, taking a module, and whether a module may be forgotten (refused while a standing assignment names it). An unassignment ends the key with a marker and keeps its earlier values, as it removed the row; no ended or pending mark is written yet. The generation rises with each change, and a seat held by an assignment goes with it: the foreign key from seat_holding is dropped by migration 0104 and the controller says both. The provisioner's plan is kept in the values by a pass of the tick that writes that one field by compare-and-set; the assignment-changed event is said from what the bucket holds, whoever wrote it. The start moves the rows with what each machine was last sent, keeping a plan the mirror put in a value.
internal/chain holds typed Build, Rollout and Assignment and a Backend with no delete or purge, in memory and on the bus. The builds and rollouts buckets are asserted with history 64, no age and values up to just under a mebibyte; the assignments bucket gets the same, keeping its marker age because a stream cannot be made to disallow message ages. Migration 0104 makes the one-row chain_moved switch. The controller keeps no consolidated schema, so 0104 is the whole schema change. Nothing reads the buckets yet.
jschoubben
mesh-tools