我正在使用 Apache NiFi 来摄取和预处理一些 CSV 文件，但是在长时间运行时，它总是失败。错误总是一样的：
FlowFile Repository failed to update
在日志中搜索，我总是看到这个错误：
2018-07-11 22:42:49,913 ERROR [Timer-Driven Process Thread-10] o.a.n.p.attributes.UpdateAttribute UpdateAttribute[id=c7f45dc9-ee12-31b0-8dee-6f1746b3c544] Failed to process session due to org.apache.nifi.processor.exception.ProcessException: FlowFile Repository failed to update: org.apache.nifi.processor.exception.ProcessException: FlowFile Repository failed to update
org.apache.nifi.processor.exception.ProcessException: FlowFile Repository failed to update
at org.apache.nifi.controller.repository.StandardProcessSession.commit(StandardProcessSession.java:405)
at org.apache.nifi.controller.repository.StandardProcessSession.commit(StandardProcessSession.java:336)
at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:28)
at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1165)
at org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:203)
at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: **Cannot update journal file ./flowfile_repository/journals/8772495.journal because this …