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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. One physical host crashed.
B. The DataNode JVM on one host is not active.
C. Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.
D. The HDFS cluster is in the safe mode.
Answer: D
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
Which code format is a valid example of an HTTPS get-interface-information method using the default port?
A. https://172.25.11.1/api/get-interface-information:3443
B. https://172.25.11.1:3443/api/get-interface-information
C. https://172.25.il.!:3443/rpc/get-interface-information
D. https://I72.25.11.1:3443/get-interface-information
Answer: A

NEW QUESTION: 3
You want a requisition file to capture information about whether a candidate is willing to relocate. What process should you follow to get this information into the requisition file?
(Choose the best answer.)
A. Add the Relocation standard field to a user-defined form, and then add that form to a section within the requisition file.
B. Create a requisition file to capture information about candidate relocation.
C. Create a user-defined form to capture the information, then add that form to a section within the requisition file.
D. Create a user-defined field to capture the information, add that field to a user-defined form, and then add that form to a section within the requisition file.
Answer: A

NEW QUESTION: 4
You have a server named Server1 that runs a Server Core installation of Windows Server 2012.
Server1 is configured to obtain an IPv4 address by using DHCP. You need to configure the IPv4 settings of the network connection on Server1 as follows:
IP address: 10.1.1.1 Subnet mask: 255.255.240.0 Default gateway: 10.1.1.254
What should you run?
A. netcfg.exe
B. New-NetlPAddress
C. Set-NetlPInterface
D. msconfig.exe
Answer: B
Explanation:
http://technet.microsoft.com/en-us/library/hh826125.aspx
http://blogs.technet.com/b/askpfeplat/archive/2013/03/29/mailbag-how-do-you-set-network-adapter-
settings-with-powershell-in-windows-8-or-windows-server-2012.aspx
The New-NetIPAddress cmdlet creates and configures an IP address. To create a specific IP address
object, specify either an IPv4 address or an IPv6 address, and an interface index or interface alias. We
recommend that you define the prefix length, also known as a subnet mask, and a default gateway.
If you run this cmdlet to add an IP address to an interface on which DHCP is already enabled, then DHCP is
automatically disabled.
OLD answer was:
Set-NetIPInterface
Modifies IP interface properties.
The Set-NetIPInterface cmdlet modifies IP interface properties such as is DHCP, IPv6 neighbor discovery
settings, router settings and Wake on LAN (WoL) settings.