Intermediate data is not written in hdfs but in local disk.
If all replicas of one or more blocks of a file become unavailable, a file is considered corrupt and any attempt to access this file will [...]
Hadoop stores data in form of blocks. A block is replicated across the cluster as per the replicationFactor which is 3 by default. Default [...]
one easy way to differentiate between Hadoop old api and new api is packages. old api packages are identifiable by mapred or to put it [...]
delete from Users where (rowid, email_adress) not in (select min(rowid), email_adress from Users group by email_address);