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NEW QUESTION: 1
Your client application submits a MapReduce job to your Hadoop cluster. Identify the Hadoop daemon on which the Hadoop framework will look for an available slot schedule a MapReduce operation.
A. DataNode
B. NameNode
C. JobTracker
D. Secondary NameNode
E. TaskTracker
Answer: C
Explanation:
JobTracker is the daemon service for submitting and tracking MapReduce jobs in Hadoop. There is only One Job Tracker process run on any hadoop cluster. Job Tracker runs on its own JVM process. In a typical production cluster its run on a separate machine. Each slave node is configured with job tracker node location. The JobTracker is single point of failure for the Hadoop MapReduce service. If it goes down, all running jobs are halted. JobTracker in Hadoop performs following actions(from Hadoop Wiki:)
Client applications submit jobs to the Job tracker. The JobTracker talks to the NameNode to determine the location of the data The JobTracker locates TaskTracker nodes with available slots at or near the data The JobTracker submits the work to the chosen TaskTracker nodes. The TaskTracker nodes are monitored. If they do not submit heartbeat signals often enough, they are deemed to have failed and the work is scheduled on a different TaskTracker. A TaskTracker will notify the JobTracker when a task fails. The JobTracker decides what to do then: it may resubmit the job elsewhere, it may mark that specific record as something to avoid, and it may may even blacklist the TaskTracker as unreliable. When the work is completed, the JobTracker updates its status.
Client applications can poll the JobTracker for information.
Reference: 24 Interview Questions & Answers for Hadoop MapReduce developers, What is a JobTracker in Hadoop? How many instances of JobTracker run on a Hadoop Cluster?
NEW QUESTION: 2
You are onsite to replace a faulted Data Mover. After the faulted Data Mover has been physically replaced, which command will return the primary Data Mover back to an active state?
A. server_standby < movername> - activate mover
B. server_setup < movername> -load mover
C. server_setup < movername> -start mover
D. server_standby < movername> -restore mover
Answer: D
NEW QUESTION: 3
Which of the following represents important technical controls for securing a SAN storage infrastructure? (Select TWO).
A. LUN masking/mapping
B. Port mapping
C. Storage pool space allocation
D. RAID configuration
E. Port scanning
F. Synchronous copy of data
G. Data de-duplication
Answer: A,B
Explanation:
A logical unit number (LUN) is a unique identifier that designates individual hard disk devices or grouped devices for address by a protocol associated with a SCSI, iSCSI, Fibre Channel (FC) or similar interface. LUNs are central to the management of block storage arrays shared over a storage area network (SAN).
LUN masking subdivides access to a given port. Then, even if several LUNs are accessed through the same port, the server masks can be set to limit each server's access to the appropriate LUNs. LUN masking is typically conducted at the host bus adapter (HBA) or switch level.
Port mapping is used in 'Zoning'. In storage networking, Fibre Channel zoning is the partitioning of a Fibre Channel fabric into smaller subsets to restrict interference, add security, and to simplify management. While a SAN makes available several devices and/or ports to a single device, each system connected to the SAN should only be allowed access to a controlled subset of these devices/ports.
Zoning can be applied to either the switch port a device is connected to OR the WWN World Wide Name on the host being connected. As port based zoning restricts traffic flow based on the specific switch port a device is connected to, if the device is moved, it will lose access. Furthermore, if a different device is connected to the port in question, it will gain access to any resources the previous host had access to.
Incorrect Answers:
A: Synchronous copy of data is used to copy data. It is not a technical control for securing a SAN storage infrastructure.
B: RAID configuration is the configuration of the disks in the SAN. A RAID is an array of disks that provides a logical pool of storage by combining the storage capacity of the disks. RAID provides hardware redundancy in that the data will not be lost if an individual disk fails. RAID configuration is not a technical control for securing a SAN storage infrastructure.
C: Data de-duplication is the process of eliminating multiple copies of the same data to save storage space. It is not a technical control for securing a SAN storage infrastructure.
D: Storage pool space allocation is the process of allocating and making available portions of the storage pool to servers. It is not a technical control for securing a SAN storage infrastructure.
E: Port scanning is the process of probing a server or host for open ports. It is not a technical control for securing a SAN storage infrastructure.
References:
http://searchvirtualstorage.techtarget.com/definition/LUN-masking
https://en.wikipedia.org/wiki/Fibre_Channel_zoning
NEW QUESTION: 4
航空会社の従業員は、以前に使用したことのない会社のアプリケーションの1つにアクセスできることに気付きました。これは情報セキュリティの問題ですか？
A. はい
B. いいえ
Answer: B