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操作	具體操作內(nèi)容
初始化hdfs文件系統(tǒng)	hdfs namenode -format
啟動集群	~/bigdata/hadoop-3.1.2/sbin/start-dfs.sh&&~/bigdata/hadoop-3.1.2/sbin/start-yarn.sh
hdfs界面	http://desktop:9870/
yarn界面	http://desktop:8088/

words.txt內(nèi)容如下:

hello tom hello jerry hello kitty hello world hello tom

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然后測試下自帶的小例子:

hdfs dfs -put words.txt /

hadoop jar hadoop-mapreduce-examples-3.1.2.jar wordcount hdfs://Desktop:9000/words.txt hdfs://Desktop:9000/wcout

hdfs dfs -ls /wcout

hdfs dfs -cat /wcout/part-r-00000

＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃附錄＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃＃

如果發(fā)現(xiàn)jps中datanode起不來，

可以把下面的兩處的clusterid改為一致(推薦修改data/current/VERSION)

然后重新啟動hdfs集群即可:

~/bigdata/hadoop-3.1.2/sbin/start-dfs.sh&&~/bigdata/hadoop-3.1.2/sbin/start-yarn.sh

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(Python3.6) appleyuchi@Laptop:dfs$ grep -ri clusterid
data/current/VERSION:clusterID=CID-3ef50261-5a59-4b70-9f7f-ce29908c7818
Binary file data/current/BP-619379440-192.168.0.102-1593400448542/current/finalized/subdir0/subdir1/blk_1073742287 matches
Binary file data/current/BP-619379440-192.168.0.102-1593400448542/current/finalized/subdir0/subdir1/blk_1073742237 matches
Binary file data/current/BP-619379440-192.168.0.102-1593400448542/current/finalized/subdir0/subdir2/blk_1073742437 matches
Binary file data/current/BP-619379440-192.168.0.102-1593400448542/current/finalized/subdir0/subdir2/blk_1073742337 matches
Binary file data/current/BP-619379440-192.168.0.102-1593400448542/current/finalized/subdir0/subdir2/blk_1073742338 matches
Binary file data/current/BP-619379440-192.168.0.102-1593400448542/current/finalized/subdir0/subdir2/blk_1073742487 matches
name/current/VERSION:clusterID=CID-a84621b5-31b1-4a75-b94a-65eda4855e05
(Python3.6) appleyuchi@Laptop:dfs$ subl data/current/VERSION

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