@Override public boolean triggerCheckpoint(final CheckpointMetaData checkpointMetaData, final CheckpointOptions checkpointOptions) { final TaskStateSnapshot checkpointStateHandles = new TaskStateSnapshot(); checkpointStateHandles.putSubtaskStateByOperatorID( OperatorID.fromJobVertexID(getEnvironment().getJobVertexId()), new OperatorSubtaskState()); getEnvironment().acknowledgeCheckpoint( checkpointMetaData.getCheckpointId(), new CheckpointMetrics(), checkpointStateHandles); triggerCheckpointLatch.countDown(); return true; }