Download PDF by James F Bisso: Programmer's Guide to the Oracle Call Interface

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Specifically, you can use the nc command to issue additional four-letter commands. This type of access to ZooKeeper might be useful when you’re investigating problems with the servers or just checking that all is okay. For this setup, the configuration file lists the main port on each server as 2181. To access the configuration details for server hc1r1m2, therefore, you use the nc command to issue a conf command. Press Enter after both the nc command line and the conf command on the following line: [[email protected] ~]$ nc conf hc1r1m2 2181 clientPort=2181 dataDir=/var/lib/zookeeper/version-2 dataLogDir=/var/lib/zookeeper/version-2 tickTime=2000 maxClientCnxns=50 minSessionTimeout=4000 maxSessionTimeout=40000 serverId=2 initLimit=10 syncLimit=5 electionAlg=3 electionPort=61050 quorumPort=60050 peerType=0 35 CHAPTER 2 N STORING AND CONFIGURING DATA WITH HADOOP, YARN, AND ZOOKEEPER This has outputted the configuration of the ZooKeeper server on hc1r1m2.

To list the actual data, you use: [[email protected] ~]$ head -20 /tmp/hadoop/part-r-00000 ! 1 " 22 "''T 1 "'-1 "'A 1 "'After 1 "'Although 1 "'Among 2 "'And 2 "'Another 1 "'As 2 "'At 1 "'Aussi 1 "'Be 2 "'Being 1 "'But 1 "'But,' 1 48 CHAPTER 2 N STORING AND CONFIGURING DATA WITH HADOOP, YARN, AND ZOOKEEPER "'But--still--monsieur----' 1 "'Catherine, 1 "'Comb 1 Again, V2 provides a sorted list of words with their counts. The successful test proves that the installed system, both HDFS and Map Reduce, works.

40 CHAPTER 2 N STORING AND CONFIGURING DATA WITH HADOOP, YARN, AND ZOOKEEPER Use the ls command to view the configuration files that need to be altered: [[email protected] [[email protected] -rw-r--r--. -rw-r--r--. -rw-r--r--. -rw-r--r--. xml on each node, as well. dir on the data node. dir /var/lib/hadoop-hdfs/cache/hdfs/dfs/name Can be a comma separated list of values 41 CHAPTER 2 N STORING AND CONFIGURING DATA WITH HADOOP, YARN, AND ZOOKEEPER On each node, make sure that the directories used in the configuration files exist: [[email protected] conf]# mkdir -p /var/lib/hadoop-hdfs/cache/hdfs/dfs/name Next, set the ownership of these directories: [[email protected] conf]# chown -R hdfs:hdfs /var/lib/hadoop-hdfs/cache/hdfs/dfs/name [[email protected] conf]# chmod 700 /var/lib/hadoop-hdfs/cache/hdfs/dfs/name The preceding commands create the name directory, change the ownership to the hdfs user, and set its permissions.

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