[GitHub] [flink] sjwiesman commented on a change in pull request #16849: [FLINK-23728][state-processor-api] Support new state backend factory stack in State Processor API

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sjwiesman commented on a change in pull request #16849:
URL: https://github.com/apache/flink/pull/16849#discussion_r689845314



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File path: flink-libraries/flink-state-processing-api/src/main/java/org/apache/flink/state/api/BootstrapTransformation.java
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@@ -215,12 +217,23 @@ StreamConfig getConfig(
         config.setOperatorName(operatorID.toHexString());
         config.setOperatorID(operatorID);
         config.setStateBackend(stateBackend);
+        config.setCheckpointStorage(getCheckpointStorage());
         // This means leaving this stateBackend unwrapped.
         config.setChangelogStateBackendEnabled(TernaryBoolean.FALSE);
         config.setManagedMemoryFractionOperatorOfUseCase(ManagedMemoryUseCase.STATE_BACKEND, 1.0);
         return config;
     }
 
+    /**
+     * @return A checkpoint storage that will write the resulting savepoint to a DFS. It is
+     *     configured with a dummy checkpoint directory to satisfy the API but should only ever be
+     *     used for savepoints. This is required to override the default checkpoint directory which
+     *     is always in memory.
+     */
+    private static CheckpointStorage getCheckpointStorage() {
+        return new FileSystemCheckpointStorage("file:///tmp/unused");

Review comment:
       yeah, that's kind of where I'm at. There aren't any particularly great solutions available here. I will explicitly disable checkpointing in the stream config for added safety. 




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