Tag - FsImage
27Mar

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: ...

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12Dec

Fault Tolerance Enhancement On Apache Hadoop 3.0.0-alpha2 For Supporting More Than 2 NameNodes

NameNode is the most critical resource in Hadoop core cluster.  Once very large files loaded into the Hadoop Distributed File System (HDFS), the files get broken into block-sized chunks as per the parameter configured (64 MB by default). The chunks are then stored as independent units across the data nodes in the cluster. The primary responsibility of the data nodes is to hold the actual data in the form of chunk and NameNode holds the information where all the chunks located/stored in the...

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