bzablocki opened a new pull request, #32962:
URL: https://github.com/apache/beam/pull/32962

   Addresses https://github.com/apache/beam/issues/32596
   
   This PR fixes a bug where messages get stuck on the Solace queue because the 
checkpoint's finalize method, responsible for acknowledging message processing, 
isn't always called. 
   
   The approach is similar to the one in PubSubIO. The flow there is the 
following:
   
   1. in the advance(), we copy message to safeToAckIds list 
([source](https://github.com/apache/beam/blob/07322cc86d35fd2af5c32228796e7936f58416d6/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubUnboundedSource.java#L885))
   2. when the runner request a checkpoint, we create it with a copy of 
safeToAck list 
([source](https://github.com/apache/beam/blob/07322cc86d35fd2af5c32228796e7936f58416d6/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubUnboundedSource.java#L996))
   3. when the checkpoint is finalized, we add the messages to a queue of 
finalized messages 
([source](https://github.com/apache/beam/blob/07322cc86d35fd2af5c32228796e7936f58416d6/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubUnboundedSource.java#L579))
   4. in the advance() method, remove whatever is in the queue of finalized 
messages from the safeToAckIds 
([source](https://github.com/apache/beam/blob/07322cc86d35fd2af5c32228796e7936f58416d6/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/pubsub/PubsubUnboundedSource.java#L617)).
   
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