CCA-500 Exam Dumps : Cloudera Certified Administrator for Apache Hadoop (CCAH)

Run hdfs fs –du / and locate the DFS Remaining value

Run hdfs dfsadmin –report and locate the DFS Remaining value

Run hdfs dfs / and subtract NDFS Used from configured Capacity

Connect to http://mynamenode:50070/dfshealth.jsp and locate the DFS remaining value

Hdfs fs –du

Hdfs fsck

Dskchk

The map-only checksum

Hadoop does not provide any tools to discover missing or corrupt data; there is not need because three replicas are kept for each data block

The Mapper stores the intermediate data on the node running the Job’s ApplicationMaster so that it is available to YARN ShuffleService before the data is presented to the Reducer

The Mapper stores the intermediate data in HDFS on the node where the Map tasks ran in the HDFS /usercache/&(user)/apache/application_&(appid) directory for the user who ran the job

The Mapper transfers the intermediate data immediately to the reducers as it is generated by the Map Task

YARN holds the intermediate data in the NodeManager’s memory (a container) until it is transferred to the Reducer

The Mapper stores the intermediate data on the underlying filesystem of the local disk in the directories yarn.nodemanager.locak-DIFS