【发布时间】：2019-07-15 19:54:38
【问题描述】：
在尝试运行水槽作业时，我收到下面给出的错误。我在 cloudera 设置上运行它。
- Kafka 是源代码
- Morphline 用作拦截器，从中创建 avro 记录。
- 接收器是 HDFS
测试环境中完全相同的文件（morphline、avro 模式等、flume 配置）。但是在另一个环境中它会抛出这个错误。
2019-07-15 14:24:17,669 WARN org.apache.flume.sink.hdfs.BucketWriter: Caught IOException writing to HDFSWriter (no protocol: value). Closing file (hdfs://8.8.8.8:8020/user/hive/warehouse/folder/folder/FlumeData.1563162656585.tmp) and rethrowing exception.
2019-07-15 14:24:17,670 INFO org.apache.flume.sink.hdfs.BucketWriter: Closing hdfs://8.8.8.8:8020/user/hive/warehouse/folder/folder/FlumeData.1563162656585.tmp
2019-07-15 14:24:17,670 ERROR org.apache.flume.sink.hdfs.HDFSEventSink: process failed
java.lang.NullPointerException
at org.apache.flume.sink.hdfs.AvroEventSerializer.flush(AvroEventSerializer.java:187)
at org.apache.flume.sink.hdfs.HDFSDataStream.close(HDFSDataStream.java:131)
at org.apache.flume.sink.hdfs.BucketWriter$3.call(BucketWriter.java:327)
at org.apache.flume.sink.hdfs.BucketWriter$3.call(BucketWriter.java:323)
at org.apache.flume.sink.hdfs.BucketWriter$9$1.run(BucketWriter.java:701)
at org.apache.flume.auth.SimpleAuthenticator.execute(SimpleAuthenticator.java:50)
at org.apache.flume.sink.hdfs.BucketWriter$9.call(BucketWriter.java:698)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
2019-07-15 14:24:17,671 ERROR org.apache.flume.SinkRunner: Unable to deliver event. Exception follows.
org.apache.flume.EventDeliveryException: java.lang.NullPointerException
at org.apache.flume.sink.hdfs.HDFSEventSink.process(HDFSEventSink.java:451)
at org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:67)
at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:145)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at org.apache.flume.sink.hdfs.AvroEventSerializer.flush(AvroEventSerializer.java:187)
at org.apache.flume.sink.hdfs.HDFSDataStream.close(HDFSDataStream.java:131)
at org.apache.flume.sink.hdfs.BucketWriter$3.call(BucketWriter.java:327)
at org.apache.flume.sink.hdfs.BucketWriter$3.call(BucketWriter.java:323)
at org.apache.flume.sink.hdfs.BucketWriter$9$1.run(BucketWriter.java:701)
at org.apache.flume.auth.SimpleAuthenticator.execute(SimpleAuthenticator.java:50)
at org.apache.flume.sink.hdfs.BucketWriter$9.call(BucketWriter.java:698)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
... 1 more
我能够在 Flume 上找到相关代码： https://github.com/apache/flume/blob/trunk/flume-ng-sinks/flume-hdfs-sink/src/main/java/org/apache/flume/sink/hdfs/BucketWriter.java (line:602)
// write the event
try {
sinkCounter.incrementEventDrainAttemptCount();
callWithTimeout(new CallRunner<Void>() {
@Override
public Void call() throws Exception {
writer.append(event); // could block
return null;
}
});
} catch (IOException e) {
LOG.warn("Caught IOException writing to HDFSWriter ({}). Closing file (" +
bucketPath + ") and rethrowing exception.",
e.getMessage());
close(true);
throw e;
}
错误：Caught IOException writing to HDFSWriter (no protocol: value). Closing file
我无法确定错误 no protocol: value 的含义。
在与 Flume 和 HDFS 相关的任何上下文中，我都找不到对此错误的任何引用。
【问题讨论】：