Raise SV2 retained job limit

.env.example

@@ -102,7 +102,7 @@ STRATUM_SUBMISSION_DEDUP_MAX_ENTRIES=10000
 # Per-client lifecycle bounds. Obsolete queued jobs are coalesced; clients are
 # disconnected instead of dropping still-recoverable candidates or buffering forever.
 SV2_JOB_RETENTION_MS=300000
-SV2_MAX_RETAINED_JOBS_PER_CHANNEL=16
+SV2_MAX_RETAINED_JOBS_PER_CHANNEL=64
 SV2_MAX_QUEUED_JOB_OPERATIONS=4
 SV2_MAX_SOCKET_BUFFER_BYTES=262144
 SV2_SOCKET_WRITE_TIMEOUT_MS=2000

README.md

@@ -125,7 +125,7 @@ Standard and extended candidates retain exact header/body reconstruction, and
 late network-target candidates remain recoverable without crediting stale shares.
 Pending SV2 canonical jobs are coalesced per client, while a new-tip activation
 is moved ahead of any not-yet-started canonical work for that tip. The finite
-defaults are 16 retained jobs per channel, four queued operations, 256 KiB of
+defaults are 64 retained jobs per channel, four queued operations, 256 KiB of
 outstanding socket writes, and a two-second write-callback deadline. A client is
 disconnected if `SV2_MAX_RETAINED_JOBS_PER_CHANNEL`,
 `SV2_MAX_QUEUED_JOB_OPERATIONS`, `SV2_MAX_SOCKET_BUFFER_BYTES`, or

src/models/StratumV2Client.spec.ts

@@ -927,6 +927,41 @@ describe('StratumV2Client extended channels', () => {
         )).toBe(true);
     });
 
+    it('keeps enough retained SV2 jobs for repeated fast activation and full-template followup cycles', async () => {
+        const { client, jobTemplate } = await createClient();
+        await (client as any).handleOpenExtendedMiningChannel(serializeOpenExtendedMiningChannel({
+            requestId: 1,
+            userIdentity: 'tb1qumezefzdeqqwn5zfvgdrhxjzc5ylr39uhuxcz4.worker',
+            nominalHashRate: 0,
+            maxTarget: Buffer.alloc(32, 0xff),
+            minExtranonceSize: 8,
+        }));
+
+        let currentTemplate = jobTemplate;
+        for (let index = 0; index < 20; index++) {
+            const activation = {
+                ...createActivationTemplate(currentTemplate),
+                previousblockhash: (index + 1).toString(16).padStart(64, '0'),
+                mintime: parseInt(MockRecording1.TIME, 16) + index + 1,
+                curtime: parseInt(MockRecording1.TIME, 16) + index + 1,
+            };
+            await client.enqueueWorkActivation(activation as any);
+            currentTemplate = {
+                ...createCanonicalFollowup(currentTemplate, activation),
+                blockData: {
+                    ...createCanonicalFollowup(currentTemplate, activation).blockData,
+                    id: `canonical-followup-${index}`,
+                },
+            };
+            await client.enqueueCanonicalJob(currentTemplate);
+        }
+
+        expect((client as any).socket.destroyed).toBe(false);
+        const channel = (client as any).channels.get(1);
+        expect(channel.extendedJobs.size).toBeLessThanOrEqual((client as any).maxRetainedJobsPerChannel);
+        expect(channel.stagedFutureJobId).toBeDefined();
+    });
+
     it('activates a staged standard future and rejects incompatible activation versions', async () => {
         const { client, sentFrames, jobTemplate } = await createClient();
         await (client as any).handleOpenStandardMiningChannel(serializeOpenStandardMiningChannel({

src/models/StratumV2Client.ts

@@ -78,7 +78,7 @@ const DEFAULT_DIFFICULTY_CHECK_INTERVAL_MS = 60 * 1000;
 const DEFAULT_CLIENT_HASHRATE_PERSIST_INTERVAL_MS = 60 * 1000;
 const FIXED_STANDARD_EXTRANONCE2 = '0000000000000000';
 const DEFAULT_SV2_JOB_RETENTION_MS = 5 * 60 * 1000;
-const DEFAULT_SV2_MAX_RETAINED_JOBS_PER_CHANNEL = 16;
+const DEFAULT_SV2_MAX_RETAINED_JOBS_PER_CHANNEL = 64;
 const DEFAULT_SV2_MAX_QUEUED_JOB_OPERATIONS = 4;
 const DEFAULT_SV2_MAX_SOCKET_BUFFER_BYTES = 256 * 1024;
 const DEFAULT_SV2_SOCKET_WRITE_TIMEOUT_MS = 2 * 1000;