NiFi写入HDFS错误：java.lang.IllegalArgumentException：无法从空字符串创建路径

Question

我在NiFi写入HDFS时遇到问题。我收到一个错误：

     ERROR [Timer-Driven Process Thread-10] o.apache.nifi.processors.hadoop.PutHDFS PutHDFS[id=4af43efa-a8ff-18ac-0000-00002377fba5] Failed to properly initialize Processor. If still scheduled to run, NiFi will attempt to initialize and run the Processor again after the 'Administrative Yield Duration' has elapsed. Failure is due to java.lang.reflect.InvocationTargetException: java.lang.reflect.InvocationTargetException
java.lang.reflect.InvocationTargetException: null
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:137)
        at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:125)
        at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotations(ReflectionUtils.java:70)
        at org.apache.nifi.util.ReflectionUtils.invokeMethodsWithAnnotation(ReflectionUtils.java:47)
        at org.apache.nifi.controller.StandardProcessorNode.lambda$initiateStart$1(StandardProcessorNode.java:1364)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        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)
Caused by: java.lang.IllegalArgumentException: Can not create a Path from an empty string
        at org.apache.hadoop.fs.Path.checkPathArg(Path.java:126)
        at org.apache.hadoop.fs.Path.<init>(Path.java:134)
        at org.apache.nifi.processors.hadoop.AbstractHadoopProcessor.getConfigurationFromResources(AbstractHadoopProcessor.java:225)
        at org.apache.nifi.processors.hadoop.AbstractHadoopProcessor.resetHDFSResources(AbstractHadoopProcessor.java:254)
        at org.apache.nifi.processors.hadoop.AbstractHadoopProcessor.abstractOnScheduled(AbstractHadoopProcessor.java:205)
        ... 15 common frames omitted

我的HDFS配置是：

注意：相同的配置已应用于PutFile，并且效果很好（Kafka.topic不为空）

Answer 1

似乎是当[[PutHDFS处理器试图保存文件以查找与kafka.topic相关联的flowfile属性，但该属性没有任何值时。

请确保您具有与kafka.topic关联的

some value

属性，我们可以在UpdataAttribute之前使用UpdataAttribute处理器添加该属性。