Reverting try twice change to writethrough.

packages/backend-core/src/cache/tests/writethrough.spec.ts

@@ -73,25 +73,15 @@ describe("writethrough", () => {
         ])
 
         // with a lock, this will work
-        const revs = responses.map(x => x.rev)
-        const startWith = ["3", "4", "5"]
-        const found = []
-        let maxRev
-        for (let starting of startWith) {
-          for (let rev of revs) {
-            if (rev?.startsWith(starting)) {
-              found.push(starting)
-            }
-            if (rev?.startsWith("5")) {
-              maxRev = rev
-            }
-          }
-        }
-        expect(found.length).toBe(3)
+        const newRev = responses.map(x => x.rev).find(x => x !== current._rev)
+        expect(newRev).toBeDefined()
+        expect(responses.map(x => x.rev)).toEqual(
+          expect.arrayContaining([current._rev, current._rev, newRev])
+        )
 
         const output = await db.get(current._id)
         expect(output.value).toBe(4)
-        expect(output._rev).toBe(maxRev)
+        expect(output._rev).toBe(newRev)
 
         current = output
       })

packages/backend-core/src/cache/writethrough.ts

@@ -44,7 +44,7 @@ async function put(
   if (updateDb) {
     const lockResponse = await locks.doWithLock(
       {
-        type: LockType.TRY_TWICE,
+        type: LockType.TRY_ONCE,
         name: LockName.PERSIST_WRITETHROUGH,
         resource: key,
         ttl: 15000,

packages/backend-core/src/redis/redlockImpl.ts

@@ -122,7 +122,6 @@ export async function doWithLock<T>(
       if (opts.type === LockType.TRY_ONCE) {
         // don't throw for try-once locks, they will always error
         // due to retry count (0) exceeded
-        console.warn(e)
         return { executed: false }
       } else {
         console.error(e)