Introduction to Impala

Impala in terms of Hadoop has got the significance because of its, Scalability Flexibility Efficiency What’s Impala? Impala is… Interactive SQL–Impala is typically 5 to 65 times faster than Hive as it minimized the response time to just seconds, not minutes. Nearly ANSI-92 standard and compatible with ...

Hadoop Cluster Commissioning and Decommissioning Nodes

To add new nodes to the cluster: 1. Add the network addresses of the new nodes to the include file. hdfs-site.xml <property> <name>dfs.hosts</name> <value>/<hadoop-home>/conf/includes</value> <final>true</final> </property> mapred-site.xml <property> <name>mapred.hosts</name> <value>/<hadoop-home>/conf/includes</value> <final>true</final> </property> Datanodes that are permitted to connect to the namenode are specified in a file whose name is specified by the dfs.hosts property. Includes file ...
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