@Override
@SuppressWarnings("unchecked")
public StreamTaskState snapshotOperatorState(long checkpointId, long timestamp) throws Exception {
if (mergingWindowsByKey != null) {
TupleSerializer<Tuple2<W, W>> tupleSerializer =
new TupleSerializer<>(
(Class) Tuple2.class, new TypeSerializer[] {windowSerializer, windowSerializer});
ListStateDescriptor<Tuple2<W, W>> mergeStateDescriptor =
new ListStateDescriptor<>("merging-window-set", tupleSerializer);
for (Map.Entry<K, MergingWindowSet<W>> key : mergingWindowsByKey.entrySet()) {
setKeyContext(key.getKey());
ListState<Tuple2<W, W>> mergeState =
getStateBackend()
.getPartitionedState(null, VoidSerializer.INSTANCE, mergeStateDescriptor);
mergeState.clear();
key.getValue().persist(mergeState);
}
}
StreamTaskState taskState = super.snapshotOperatorState(checkpointId, timestamp);
AbstractStateBackend.CheckpointStateOutputView out =
getStateBackend().createCheckpointStateOutputView(checkpointId, timestamp);
snapshotTimers(out);
taskState.setOperatorState(out.closeAndGetHandle());
return taskState;
}
@Override
public StreamTaskState snapshotOperatorState(long checkpointId, long timestamp) throws Exception {
StreamTaskState taskState = super.snapshotOperatorState(checkpointId, timestamp);
// we write the panes with the key/value maps into the stream
StateBackend.CheckpointStateOutputView out =
getStateBackend().createCheckpointStateOutputView(checkpointId, timestamp);
int numKeys = windows.size();
out.writeInt(numKeys);
for (Map.Entry<K, Map<W, Context>> keyWindows : windows.entrySet()) {
int numWindows = keyWindows.getValue().size();
out.writeInt(numWindows);
for (Context context : keyWindows.getValue().values()) {
context.writeToState(out);
}
}
taskState.setOperatorState(out.closeAndGetHandle());
return taskState;
}