[ 
https://issues.apache.org/jira/browse/BEAM-13402?focusedWorklogId=701696&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-701696
 ]

ASF GitHub Bot logged work on BEAM-13402:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 28/Dec/21 20:59
            Start Date: 28/Dec/21 20:59
    Worklog Time Spent: 10m 
      Work Description: ibzib commented on a change in pull request #16358:
URL: https://github.com/apache/beam/pull/16358#discussion_r776065734



##########
File path: 
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsublite/internal/SubscriberAssembler.java
##########
@@ -67,42 +86,54 @@ private SubscriberServiceClient 
newSubscriberServiceClient() throws ApiException
     }
   }
 
+  private SubscriberServiceClient getSubscriberServiceClient() {
+    return SUB_CLIENTS.computeIfAbsent(
+        options.subscriptionPath(), path -> newSubscriberServiceClient());
+  }
+
+  private CursorClient newCursorClient() throws ApiException {
+    return CursorClient.create(
+        CursorClientSettings.newBuilder()
+            .setRegion(options.subscriptionPath().location().extractRegion())
+            .build());
+  }
+
+  private CursorClient getCursorClient() {
+    return CURSOR_CLIENTS.computeIfAbsent(options.subscriptionPath(), path -> 
newCursorClient());
+  }
+
+  SubscriberAssembler(SubscriberOptions options, Partition partition) {

Review comment:
       Nit: I prefer to place important methods such as the constructor first 
so the file is easier to read.

##########
File path: 
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsublite/internal/SubscriberAssembler.java
##########
@@ -18,47 +18,66 @@
 package org.apache.beam.sdk.io.gcp.pubsublite.internal;
 
 import static com.google.cloud.pubsublite.internal.ExtractStatus.toCanonical;
-import static 
com.google.cloud.pubsublite.internal.wire.ServiceClients.addDefaultMetadata;
 import static 
com.google.cloud.pubsublite.internal.wire.ServiceClients.addDefaultSettings;
+import static 
com.google.cloud.pubsublite.internal.wire.ServiceClients.getCallContext;
 import static java.util.concurrent.TimeUnit.MINUTES;
 
+import com.google.api.gax.rpc.ApiCallContext;
 import com.google.api.gax.rpc.ApiException;
+import com.google.cloud.pubsublite.AdminClient;
+import com.google.cloud.pubsublite.AdminClientSettings;
 import com.google.cloud.pubsublite.Offset;
 import com.google.cloud.pubsublite.Partition;
+import com.google.cloud.pubsublite.SubscriptionPath;
+import com.google.cloud.pubsublite.TopicPath;
 import com.google.cloud.pubsublite.internal.CursorClient;
 import com.google.cloud.pubsublite.internal.CursorClientSettings;
+import com.google.cloud.pubsublite.internal.ExtractStatus;
 import com.google.cloud.pubsublite.internal.wire.PubsubContext;
 import com.google.cloud.pubsublite.internal.wire.PubsubContext.Framework;
 import com.google.cloud.pubsublite.internal.wire.RoutingMetadata;
 import com.google.cloud.pubsublite.internal.wire.SubscriberBuilder;
 import com.google.cloud.pubsublite.internal.wire.SubscriberFactory;
-import com.google.cloud.pubsublite.proto.CommitCursorRequest;
 import com.google.cloud.pubsublite.proto.Cursor;
 import com.google.cloud.pubsublite.proto.SeekRequest;
-import com.google.cloud.pubsublite.v1.CursorServiceClient;
-import com.google.cloud.pubsublite.v1.CursorServiceSettings;
 import com.google.cloud.pubsublite.v1.SubscriberServiceClient;
 import com.google.cloud.pubsublite.v1.SubscriberServiceSettings;
+import java.util.concurrent.ConcurrentHashMap;
 import org.apache.beam.sdk.io.gcp.pubsublite.SubscriberOptions;
 
 class SubscriberAssembler {
   private static final Framework FRAMEWORK = Framework.of("BEAM");
+  private static final ConcurrentHashMap<SubscriptionPath, TopicPath> 
KNOWN_PATHS =
+      new ConcurrentHashMap<>();
+  private static final ConcurrentHashMap<SubscriptionPath, 
SubscriberServiceClient> SUB_CLIENTS =
+      new ConcurrentHashMap<>();
+  private static final ConcurrentHashMap<SubscriptionPath, CursorClient> 
CURSOR_CLIENTS =
+      new ConcurrentHashMap<>();
+
   private final SubscriberOptions options;
   private final Partition partition;
 
-  SubscriberAssembler(SubscriberOptions options, Partition partition) {
-    this.options = options;
-    this.partition = partition;
+  private static TopicPath lookupTopicPath(SubscriptionPath subscriptionPath) {
+    try (AdminClient adminClient =
+        AdminClient.create(
+            AdminClientSettings.newBuilder()
+                .setRegion(subscriptionPath.location().extractRegion())
+                .build())) {
+      return TopicPath.parse(
+          adminClient.getSubscription(subscriptionPath).get(1, 
MINUTES).getTopic());
+    } catch (Throwable t) {

Review comment:
       ```suggestion
       } catch (Exception e) {
   ```
   
   Don't attempt to catch Errors unless there is a special reason to do so. 
(This pattern is already widely used so it's fine to bulk edit in a separate 
PR.)
   
   https://docs.oracle.com/javase/8/docs/api/java/lang/Error.html




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 701696)
    Time Spent: 10h 20m  (was: 10h 10m)

> Pub/Sub Lite commits can take 10s of hours without completing
> -------------------------------------------------------------
>
>                 Key: BEAM-13402
>                 URL: https://issues.apache.org/jira/browse/BEAM-13402
>             Project: Beam
>          Issue Type: Bug
>          Components: io-java-gcp
>            Reporter: Daniel Collins
>            Priority: P2
>          Time Spent: 10h 20m
>  Remaining Estimate: 0h
>
> [https://github.com/googleapis/gax-java/issues/1577] filed upstream



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