Make MAX_WORKERS Env Var.

.env

@@ -32,6 +32,8 @@ LOCAL_DOCKER_MOUNT=/tmp/airbyte_local
 # Issue: https://github.com/airbytehq/airbyte/issues/577
 HACK_LOCAL_ROOT_PARENT=/tmp
 
+SUBMITTER_NUM_THREADS=10
+
 # Miscellaneous
 TRACKING_STRATEGY=segment
 WEBAPP_URL=http://localhost:8000/

airbyte-config/models/src/main/java/io/airbyte/config/Configs.java

@@ -67,6 +67,8 @@ public interface Configs {
 
   String getKubeNamespace();
 
+  String getSubmitterNumThreads();
+
   // Resources
   String getCpuRequest();
 

airbyte-config/models/src/main/java/io/airbyte/config/EnvConfigs.java

@@ -59,6 +59,7 @@ public class EnvConfigs implements Configs {
   private static final String TEMPORAL_HOST = "TEMPORAL_HOST";
   private static final String TEMPORAL_WORKER_PORTS = "TEMPORAL_WORKER_PORTS";
   private static final String KUBE_NAMESPACE = "KUBE_NAMESPACE";
+  private static final String SUBMITTER_NUM_THREADS = "SUBMITTER_NUM_THREADS";
   private static final String RESOURCE_CPU_REQUEST = "RESOURCE_CPU_REQUEST";
   private static final String RESOURCE_CPU_LIMIT = "RESOURCE_CPU_LIMIT";
   private static final String RESOURCE_MEMORY_REQUEST = "RESOURCE_MEMORY_REQUEST";
@@ -190,6 +191,11 @@ public String getKubeNamespace() {
     return getEnvOrDefault(KUBE_NAMESPACE, DEFAULT_KUBE_NAMESPACE);
   }
 
+  @Override
+  public String getSubmitterNumThreads() {
+    return getEnvOrDefault(SUBMITTER_NUM_THREADS, "5");
+  }
+
   @Override
   public String getCpuRequest() {
     return getEnvOrDefault(RESOURCE_CPU_REQUEST, DEFAULT_RESOURCE_REQUIREMENT_CPU);

airbyte-scheduler/app/src/main/java/io/airbyte/scheduler/app/SchedulerApp.java

@@ -75,16 +75,20 @@
 
 /**
  * The SchedulerApp is responsible for finding new scheduled jobs that need to be run and to launch
- * them. The current implementation uses a thread pool on the scheduler's machine to launch the
- * jobs. One thread is reserved for the job submitter, which is responsible for finding and
- * launching new jobs.
+ * them. The current implementation uses two thread pools to do so. One pool is responsible for all
+ * job launching operations. The other pool is responsible for clean up operations.
+ *
+ * Operations can have thread pools under the hood. An important thread pool to note is that the job
+ * submitter thread pool. This pool does the work of submitting jobs to temporal - the size of this
+ * pool determines the number of concurrent jobs that can be run. This is controlled via the
+ * {@link #SUBMITTER_NUM_THREADS} variable.
  */
 public class SchedulerApp {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(SchedulerApp.class);
 
   private static final long GRACEFUL_SHUTDOWN_SECONDS = 30;
-  private static final int MAX_WORKERS = 4;
+  private static final int SUBMITTER_NUM_THREADS = Integer.parseInt(new EnvConfigs().getSubmitterNumThreads());
   private static final Duration SCHEDULING_DELAY = Duration.ofSeconds(5);
   private static final Duration CLEANING_DELAY = Duration.ofHours(2);
   private static final ThreadFactory THREAD_FACTORY = new ThreadFactoryBuilder().setNameFormat("worker-%d").build();
@@ -121,7 +125,7 @@ public void start() throws IOException {
     final TemporalPool temporalPool = new TemporalPool(temporalService, workspaceRoot, processFactory);
     temporalPool.run();
 
-    final ExecutorService workerThreadPool = Executors.newFixedThreadPool(MAX_WORKERS, THREAD_FACTORY);
+    final ExecutorService workerThreadPool = Executors.newFixedThreadPool(SUBMITTER_NUM_THREADS, THREAD_FACTORY);
     final ScheduledExecutorService scheduledPool = Executors.newSingleThreadScheduledExecutor();
     final TemporalWorkerRunFactory temporalWorkerRunFactory = new TemporalWorkerRunFactory(temporalClient, workspaceRoot);
     final JobRetrier jobRetrier = new JobRetrier(jobPersistence, Instant::now, jobNotifier);

docker-compose.yaml

@@ -60,6 +60,7 @@ services:
       - AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY}
       - GCP_STORAGE_BUCKET=${GCP_STORAGE_BUCKET}
       - LOG_LEVEL=${LOG_LEVEL}
+      - SUBMITTER_NUM_THREADS=${SUBMITTER_NUM_THREADS}
       - RESOURCE_CPU_REQUEST=${RESOURCE_CPU_REQUEST}
       - RESOURCE_CPU_LIMIT=${RESOURCE_CPU_LIMIT}
       - RESOURCE_MEMORY_REQUEST=${RESOURCE_MEMORY_REQUEST}

kube/overlays/dev/.env

@@ -24,6 +24,8 @@ WORKSPACE_DOCKER_MOUNT=airbyte_workspace
 
 LOCAL_ROOT=/tmp/airbyte_local
 
+SUBMITTER_NUM_THREADS=10
+
 # Miscellaneous
 TRACKING_STRATEGY=logging
 WEBAPP_URL=airbyte-webapp-svc:80

kube/overlays/stable-with-resource-limits/.env

@@ -24,6 +24,8 @@ WORKSPACE_DOCKER_MOUNT=airbyte_workspace
 
 LOCAL_ROOT=/tmp/airbyte_local
 
+SUBMITTER_NUM_THREADS=10
+
 # Miscellaneous
 TRACKING_STRATEGY=segment
 WEBAPP_URL=airbyte-webapp-svc:80

kube/overlays/stable/.env

@@ -24,6 +24,8 @@ WORKSPACE_DOCKER_MOUNT=airbyte_workspace
 
 LOCAL_ROOT=/tmp/airbyte_local
 
+SUBMITTER_NUM_THREADS=10
+
 # Miscellaneous
 TRACKING_STRATEGY=segment
 WEBAPP_URL=airbyte-webapp-svc:80

kube/resources/scheduler.yaml

@@ -99,6 +99,11 @@ spec:
               valueFrom:
                 fieldRef:
                   fieldPath: metadata.namespace
+            - name: SUBMITTER_NUM_THREADS
+              valueFrom:
+                configMapKeyRef:
+                  name: airbyte-env
+                  key: SUBMITTER_NUM_THREADS
             - name: RESOURCE_CPU_REQUEST
               valueFrom:
                 configMapKeyRef: