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This usually occurs when your current directory does not exist anymore. To fix you only change to available directory. Example $  cd ~/

Apache Kafka  is an  open-source   stream processing  platform developed by the  Apache Software Foundation  written in  Scala  and  Java . The project aims to provide a unified, high-throughput, low-latency platform for handling real-time data feeds. Its storage layer is essentially a "massively scalable pub/sub message queue architected as a distributed transaction log," [3]  making it highly valuable for enterprise infrastructures to process streaming data. Additionally, Kafka connects to external systems (for data import/export) via Kafka Connect and provides Kafka Streams, a  Java  stream processing  library .

Introduction Apache NiFi is a dataflow system based on the concepts of flow-based programming. It supports powerful and scalable directed graphs of data routing, transformation, and system mediation logic. NiFi has a web-based user interface for design, control, feedback, and monitoring of dataflows. It is highly configurable along several dimensions of quality of service, such as loss-tolerant versus guaranteed delivery, low latency versus high throughput, and priority-based queuing. NiFi provides fine-grained data provenance for all data received, forked, joined cloned, modified, sent, and ultimately dropped upon reaching its configured end-state. See the  System Administrator’s Guide  for information about system requirements, installation, and configuration. Once NiFi is installed, use a supported web browser to view the UI. Browser Support Browser Version Chrome Current and Current - 1 FireFox Current and Current - 1 Edge Current an...