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NEW QUESTION: 1
Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?
A. Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.
B. The HDFS cluster is in the safe mode.
C. The DataNode JVM on one host is not active.
D. One physical host crashed.
Answer: B
Explanation:
The data from the dead node is being replicated. The cluster is in safemode.
Note:
*Safemode During start up Namenode loads the filesystem state from fsimage and edits log file. It then waits for datanodes to report their blocks so that it does not prematurely start replicating the blocks though enough replicas already exist in the cluster. During this time Namenode stays in safemode. A Safemode for Namenode is essentially a read-only mode for the HDFS cluster, where it does not allow any modifications to filesystem or blocks. Normally Namenode gets out of safemode automatically at the beginning. If required, HDFS could be placed in safemode explicitly using 'bin/hadoop dfsadmin -safemode' command. Namenode front page shows whether safemode is on or off. A more detailed description and configuration is maintained as JavaDoc for setSafeMode().
*Data Disk Failure, Heartbeats and Re-Replication Each DataNode sends a Heartbeat message to the NameNode periodically. A network partition can cause a subset of DataNodes to lose connectivity with the NameNode. The NameNode detects this condition by the absence of a Heartbeat message. The NameNode marks DataNodes without recent Heartbeats as dead and does not forward any new IO requests to them. Any data that was registered to a dead DataNode is not available to HDFS any more. DataNode death may cause the replication factor of some blocks to fall below their specified value. The NameNode constantly tracks which blocks need to be replicated and initiates replication whenever necessary. The necessity for re-replication may arise due to many reasons: a DataNode may become unavailable, a replica may become corrupted, a hard disk on a DataNode may fail, or the replication factor of a file may be increased.
*NameNode periodically receives a Heartbeat and a Blockreport from each of the DataNodes in the cluster. Receipt of a Heartbeat implies that the DataNode is functioning properly. A Blockreport contains a list of all blocks on a DataNode. When NameNode notices that it has not recieved a hearbeat message from a data node after a certain amount of time, the data node is marked as dead. Since blocks will be under replicated the system begins replicating the blocks that were stored on the dead datanode. The NameNode Orchestrates the replication of data blocks from one datanode to another. The replication data transfer happens directly between datanodes and the
data never passes through the namenode.
Incorrrect answers:
B: The data is not lost, it is being replicated.
Reference: 24 Interview Questions & Answers for Hadoop MapReduce developers, How NameNode Handles data node failures?

NEW QUESTION: 2
You are the Microsoft Project Server administrator for your company. Henry, a project manager in your organization, approaches you about a problem. Management has told Henry that his project team is not to work any overtime on a project. Management would like Henry to provide a report that highlights any project team that has worked overtime on a task within a given time period. Henry needs your assistance to create this report. Which report would you recommend to Henry?
A. The Timesheet Audit Report
B. Timesheet Classification
C. Resource Availability Graph
D. Status Report
Answer: A
Explanation:
The Timesheet Audit Report is a Project Center report that can be used to highlight types of work, including overtime work, within a given time period. Answer option D is incorrect. Timesheet classification is not a report type, but a method to designate the type of work that is being completed on the project. Answer option A is incorrect. The Resource Availability Graph is not a report, but a charting feature in Project Center. Answer option B is incorrect. The Status Report does not include overtime features and is generally not used for management's view of the project. It is often for the project team to examine the project work to be done in the project.

NEW QUESTION: 3
A situation has arisen which will involve you participating in transactions which are legally correct but ethically unsound.
Which of the following is correct?
(i) It is not possible for a transaction to be both legal and ethically unsound.
(ii) As long as the transactions are legal you are acting properly in participating.
(iii) One of the purposes of ethical codes is to guide professionals as to how to behave even when the proposed transactions are legal.
A. (ii) only
B. (i) only
C. (iii) only
D. (i) and (ii) only
Answer: C

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