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Overcome LEADER_NOT_AVAILABLE error on Multi-node Apache Kafka Cluster

Kafka Connect assumes a significant part in streaming data between Apache Kafka and other data systems. As a tool, it holds the responsibility of a scalable and reliable way to move the data in and out of Apache Kafka. Importing data from the Database set to Apache Kafka is surely perhaps the most well-known use instance of JDBC Connector (Source & Sink) that belongs to Kafka Connect. This short article aims to elaborate on the steps on how can we...

Error while batch processing of rest data persisted in Basic Hadoop based (HDFS) Data Lake “Permission denied: user=dr.who, access=READ_EXECUTE, inode=”/tmp”:hdadmin:supergroup:drwx……..”

Typically, persisting unstructured data and subsequent batch processing can be very costly and is not advisable for small organizations & startups, as cost is prime factor for them. A Hadoop based Data Lake using Map-Reduce, fits perfectly in this scenario which is not only cost effective but also scalable and easy to extend further. Though it may sound a great option to have, we might face issues while setting up the same and one of common issues is, error "Permission...

Resolved – ” Incompatible clusterIds in… ” in Multi Node Hadoop Cluster Setup

Currently, there are many startups / small companies and their customers, working on Data Analytics, ML, AI and related solutions. Due to their budget constraints, some of them don't want to leverage Cloud-based storage. Alternatively, to process ingested data, they create basic Data Lake using HDFS. During this process, they might encounter the exception of "org.apache.hadoop.hdfs.server.common.Storage: java.io.IOException: Incompatible clusterIDs in /home/....". while starting the Name Node or Master Node in a multi-node Hadoop Cluster. This may occur in the following scenarios: ...