Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/2707#discussion_r86557000
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/operators/GenericWriteAheadSink.java
---
@@ -77,111 +84,144 @@ public GenericWriteAheadSink(CheckpointCommitter
committer, TypeSerializer<IN> s
public void open() throws Exception {
super.open();
committer.setOperatorId(id);
-
committer.setOperatorSubtaskId(getRuntimeContext().getIndexOfThisSubtask());
committer.open();
- cleanState();
- checkpointStreamFactory =
-
getContainingTask().createCheckpointStreamFactory(this);
+
+ checkpointStreamFactory = getContainingTask()
+ .createCheckpointStreamFactory(this);
+
+ cleanRestoredHandles();
}
public void close() throws Exception {
committer.close();
}
/**
- * Saves a handle in the state.
+ * Called when a checkpoint barrier arrives. It closes any open streams
to the backend
+ * and marks them as pending for committing to the external,
third-party storage system.
*
- * @param checkpointId
- * @throws IOException
+ * @param checkpointId the id of the latest received checkpoint.
+ * @throws IOException in case something went wrong when handling the
stream to the backend.
*/
private void saveHandleInState(final long checkpointId, final long
timestamp) throws Exception {
+ Preconditions.checkNotNull(this.pendingCheckpoints, "The
operator has not been properly initialized.");
--- End diff --
This can't happen and is thus unnecessary.
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