我有一个简单的流声明如下:
Source.tick(Duration.ofSeconds(1), Duration.ofSeconds(30), Files.list(rootDir).collect(Collectors.toList()))
.mapConcat(files -> files)
.log("scanning logs")
.via(logsFlow.create())
.via(kafkaFlow.create())
// .via(archiveFlow.create())
.runWith(Sink.ignore(), materializer)
.whenComplete((a, b) -> {
log.info("done");
});
随着archiveFlow注释掉一切都像预期的那样。但是当我添加额外的流程时,无论是归档流程还是像这样的简单流程:
.via(Flow.of(Path.class).map(path -> {
log.info("foo");
return path;
}))
流在第一次打勾后完成。这是为什么?
2019-03-20 21:35:09.292 DEBUG 50089 --- [lt-dispatcher-2] a.kafka.internal.DefaultProducerStage : Stage completed
2019-03-20 21:35:09.294 DEBUG 50089 --- [lt-dispatcher-4] akka.stream.Materializer : [scanning logs] Downstream finished.
2019-03-20 21:35:09.296 INFO 50089 --- [onPool-worker-3] com.example.MyStream : done
事实证明,Akka吞下了一个错误。我使用监督策略,现在一切正常。