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Migrate/Transfer/Copy AWS Data from volumes or S3 to Hadoop

Hadoop distcp s3n://bucketname/directoryname/test.csv /user/myuser/mydirectory/

 

Detail information can be found at following link.

https://hortonworks.github.io/hdp-aws/s3-copy-data/index.html

Placing Namenode in safemode and Perform checkpoint

Normally in real environment secondary node performs checkpoint operation and keep syncing with active namenode to keep latest FSimage. In HA environment active namenode writes edit log into journal node and standby node go and get the edit log and create new FSimage.

[hdfs@datanode1 ~]$ hdfs dfsadmin -safemode get Safe mode is OFF

[hdfs@datanode1 ~]$ […]