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NEW QUESTION: 1

A. Option A
B. Option D
C. Option B
D. Option C
Answer: D

NEW QUESTION: 2
In a cluster configured with HDFS High Availability (HA) but NOT HDFS federation, each map task run:
A. In the same Java Virtual Machine as the TaskTracker
B. In the same Java Virtual Machine as the JobTracker.
C. In its own Java Virtual Machine.
D. In the same Java Virtual Machine as the DataNode.
Answer: C
Explanation:
A TaskTracker is a slave node daemon in the cluster that accepts tasks (Map, Reduce and Shuffle operations) from a JobTracker. There is only One Task Tracker process run on any hadoop slave node. Task Tracker runs on its own JVM process. Every TaskTracker is configured with a set of slots, these indicate the number of tasks that it can accept. The TaskTracker starts a separate JVM processes to do the actual work (called as Task Instance) this is to ensure that process failure does not take down the task tracker. The TaskTracker monitors these task instances, capturing the output and exit codes. When the Task instances finish, successfully or not, the task tracker notifies the JobTracker. The TaskTrackers also send out heartbeat messages to the JobTracker, usually every few minutes, to reassure the JobTracker that it is still alive. These message also inform the JobTracker of the number of available slots, so the JobTracker can stay up to date with where in the cluster work can be delegated.
Note:Despite this very high level of reliability, HDFS has always had a well-known single point of failure which impacts HDFS's availability: the system relies on a single Name Node to coordinate access to the file system data. In clusters which are used exclusively for ETL or batch-processing workflows, a brief HDFS outage may not have immediate business impact on an organization; however, in the past few years we have seen HDFS begin to be used for more interactive workloads or, in the case of HBase, used to directly serve customer requests in real time. In cases such as this, an HDFS outage will immediately impact the productivity of internal users, and perhaps result in downtime visible to external users. For these reasons, adding high availability (HA) to the HDFS Name Node became one of the top priorities for the HDFS community.
Reference:24 Interview Questions & Answers for Hadoop MapReduce developers,What is a Task Tracker in Hadoop? How many instances of TaskTracker run on a Hadoop Cluster

NEW QUESTION: 3
HOTSPOT


Answer:
Explanation:

NEW QUESTION: 4
According to ISO/IEC 20000-1, the use of suppliers to provide aspects of the Service Management processes is acceptable.
What level of the supply chain must the service provider manage?
A. Only as agreed in the contracts between the various parties
B. Only the subcontractors as the lead supplier is integral to the service delivery and self-managing
C. Only the relationship between the lead supplier and service provider
D. All relationships between lead and subcontracted suppliers
Answer: C