최신Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) - CCA-470무료샘플문제

A. 48 1.5 TB disk drives in a RAID configuration

B. Four 1TB disk drives in a JBOD configuration

C. One 1TB disk drive

D. 48 1.5TB disk drives in a JBOD configuration

E. Four 1TB disk drives in a RAID configuration

A. Application Manager

B. NameNode

C. Node Manager

D. Secondary NameNode

E. DataNode

F. Resource Manager

A. All DataNodes simultaneously fail.

B. Seventy percent of DataNodes simultaneously fail.

C. Ten percent of DataNodes simultaneously fail.

D. An entire rack fails.

E. Multiple racks simultaneously fail.

A. The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.

B. The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.

C. The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.

D. The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.

A. Rack location is considered in the HDFS block placement policy.

B. Even for small clusters on a single rack, configuring rack awareness will improve performance.

C. Configuration of rack awareness is accomplished using a configuration file. You cannot use a rack topology script.

D. HDFS is rack aware but MapReduce daemons are not.

E. Hadoop gives preference to intra-rack data transfer In order to conserve bandwidth.

A. Standardize on a single MapReduce API.

B. HDFS latency.

C. Ability to run frameworks other than MapReduce, such as MPI.

D. Single point of failure in the NameNode.

E. Resource pressure on the JobTrackr

F. Reduce complexity of the MapReduce APIs.

A. Encryption on all remote procedure calls (RPCs)

B. Root access to the cluster for users hdfs and mapred but non-root acess clients

C. User authentication on all remote procedure calls (RPcs)

D. Encryption for data on disk ("at rest")

E. Authentication for user access to the cluster against a central server

A. Du

B. Fsck

C. Dskchk

D. The map-only checksum utility,

E. Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.

A. The change is written to the edits file.

B. The metadata in RAM on the NameNode is updated.

C. The change is written to the NameNode disk.

D. The metadata in the RAM on the NameNode is flushed to disk.

E. Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.

F. The metadata in RAM on the NameNode is flushed disk.