June 2019
Beginner to intermediate
360 pages
10h 55m
English
Content preview from Big Data Simplified
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50 | Big Data Simplied
• Stop hadoop cluster as follows.
$ ./stop-yarn.sh
$ ./stop-dfs.sh
After the shutdown of Hadoop cluster, all the Hadoop Java daemons are stopped in this
above screen, the
‘jps’ command returned only the ‘jps’ itself as it is also a Java process.
3.4 STORING DATA WITH HDFS
3.4.1 The NameNode and DataNodes
As discussed in the preceding sections of this chapter, HDFS is spread out across multiple
machines, each of these machines in the cluster being a rather simple one with commodity hard-
ware. Also, the value of HDFS lies in, if the cluster as a whole is highly fault tolerant. In addition,
it can store huge volumes ...
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