local_offer hive local_offer hdfs
In Hive, there are two types of tables can be created - internal and external table. Internal tables are also called managed tables. Different features are available to different types. This article lists some of the common differences. Internal table By default, Hive creates ...
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Schema evolution is supported by many frameworks or data serialization systems such as Avro, Orc, Protocol Buffer and Parquet. With schema evolution, one set of data can be stored in multiple files with different but compatible schema. In Spark, Parquet data source can detect and merge schema ...
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Issue When installing Hadoop 3.2.1 on Windows 10, you may encounter the following error when trying to format HDFS namnode: ERROR namenode.NameNode: Failed to start namenode. The error happens when running the following comm...
Copy Files from Hadoop HDFS to Local
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Copy file from HDFS to local Use the following command: hadoop fs [-copyToLocal [-f] [-p] [-ignoreCrc] [-crc] <src> ... <localdst>] For example, copy a file from /hdfs-file.txt in HDFS to local /tmp/ using the following command: ...
local_offer lite-log local_offer hadoop local_offer hdfs
In Safe Mode, the HDFS cluster is read-only. After completion of block replication maintenance activity, the name node leaves safe mode automatically. If you try to delete files in safe mode, the following exception may raise: org.apache.hadoop.ipc.RemoteException(org.apac...
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This page continues with the following documentation about configuring a Hadoop multi-nodes cluster via adding a new edge node to configure administration or client tools. ...
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This page summarizes the default ports used by Hadoop services. It is useful when configuring network interfaces in a cluster. Hadoop 3.1.0 HDFS The secondary namenode http/https server address and port. ...
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Previously, I summarized the steps to install Hadoop in a single node Windows machine. Install Hadoop 3.0.0 in Windows (Single Node) In this page, ...
local_offer SQL Server local_offer spark local_offer hdfs local_offer parquet local_offer sqoop
This page shows how to import data from SQL Server into Hadoop via Apache Sqoop. Prerequisites Please follow the link below to install Sqoop in your machine if you don’t have one environment ready. ...
local_offer lite-log local_offer spark local_offer hdfs local_offer scala local_offer parquet
In my previous post, I demonstrated how to write and read parquet files in Spark/Scala. The parquet file destination is a local folder. Write and Read Parquet Files in Spark/Scala In this page...
