REP-5299 Finalize change stream with a timestamp. (#47)

Previously to finalize its change stream the verifier would just TryNext() until no responses arrived. This works fine for unsharded clusters, but for sharded clusters it can potentially miss events.

This changeset adopts more “tried-and-true” logic: grab a timestamp via `appendOplogNote`, then iterate the change stream until the stream’s resume token’s timestamp meets or exceeds that timestamp. As verification of that change, this changeset removes the test skips that REP-5306 (PR #48) imposed for sharded clusters.

The timestamp-grabbing logic is unconditionally retryable, which requires an update to the retryer module to implement. This changeset refactors that module a bit to prevent further duplication.

Additional changes:
- go.sum is now part of the repo.
- Go 1.22 is now a minimum requirement.
- Tests no longer spew output when the worker delay is 0. The log message for that delay is also tweaked to show the delay.
- Mention in code of the defunct “refetch” collection is removed.
- The change stream no longer logs whenever a batch of events arrives. For busy migrations it would be excessive.
- Verifier instances in tests now wait 10ms rather than 15s between generations, which makes a few tests much quicker.
- A new CheckRunner improves the ergonomics of running CheckDriver in tests.
- TestGenerationalRechecking used to verify that an insert after WritesOff() gets handled as a recheck. This doesn’t make a lot of sense since WritesOff() means, by definition, that no more events should happen on the server. Thus, this changeset removes that test, which was proving rather race-prone with the rest of these changes.
- The tests now use majority read & write concern.
- CI now parallelizes a bit more of its setup.
- A new CheckRunner struct smooths over running Check from e2e tests.
- Tests now use a 10ms verificationStatusCheckInterval rather than 15-minute.

Author: FGasper

.github/workflows/all.yml

@@ -11,6 +11,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+
+        # versions are: source, destination
         mongodb_versions:
           - [ '4.2', '4.2' ]
           - [ '4.2', '4.4' ]
@@ -58,8 +60,12 @@ jobs:
         with:
           go-version: stable
 
-      - name: Install m
-        run: npm install -g m mongosh
+      - name: Install m and mtools
+        run: |-
+            {
+                echo npm install -g m
+                echo pipx install 'mtools[all]'
+            } | parallel
 
       - name: Install MongoDB ${{ matrix.mongodb_versions[0] }} (source)
         run: yes | m ${{ matrix.mongodb_versions[0] }} && dirname $(readlink $(which mongod)) > .srcpath
@@ -70,18 +76,15 @@ jobs:
       - name: Install latest stable MongoDB (metadata)
         run: yes | m stable && dirname $(readlink $(which mongod)) > .metapath
 
-      - name: Install mtools
-        run: pipx install 'mtools[all]'
-
       - name: Build
         run: go build main/migration_verifier.go
 
       - name: Start clusters
         run: |-
             {
-                echo "mlaunch init --binarypath $(cat .srcpath) --port 27020 --dir src --replicaset ${{ matrix.topology.args }}"
-                echo "mlaunch init --binarypath $(cat .dstpath) --port 27030 --dir dst --replicaset ${{ matrix.topology.args }}"
-                echo "mlaunch init --binarypath $(cat .metapath) --port 27040 --dir meta --replicaset --nodes 1"
+                echo mlaunch init --binarypath $(cat .srcpath) --port 27020 --dir src --replicaset ${{ matrix.topology.args }}
+                echo mlaunch init --binarypath $(cat .dstpath) --port 27030 --dir dst --replicaset ${{ matrix.topology.args }}
+                echo mlaunch init --binarypath $(cat .metapath) --port 27040 --dir meta --replicaset --nodes 1
             } | parallel
 
       - name: Test

.gitignore

@@ -1,5 +1,4 @@
 dev-bin/
-go.sum
 golangci-lint
 migration_verifier
 internal/verifier/mongodb_exec/

go.mod

@@ -1,6 +1,6 @@
 module github.com/10gen/migration-verifier
 
-go 1.20
+go 1.22
 
 require (
 	github.com/cespare/permute/v2 v2.0.0-beta2

go.sum

@@ -0,0 +1,169 @@
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