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NEW QUESTION: 1
Which of the following channels is the control information for transmitting the number of OFDMA symbols occupied by the PDCCH?
A. PDCCH
B. PDSCH
C. PCRCH
D. PBCH
Answer: C
NEW QUESTION: 2
Service Consumer A sends a message to Service A.
There are currently three duplicate implementations of Service A (Implementation 1, Implementation 2, Implementation 3).
The message sent by Service Consumer A is intercepted by Service Agent A (1), which
determines at runtime which implementation of Service A to forward the message to.
All three implementations of Service A reside on the same physical server.
You are told that after Service A was deployed, each of its three implementations was
claimed by a different IT department, which means each implementation of Service A has a
different owner. You are informed that a new service capability will soon need to be added
to Service A . This service capability will introduce new business logic specific to Service A
as well as logic required to access a shared database. What steps can be taken to ensure
that the service owners will each add the service capability in a consistent manner to their
respective implementations of Service A?
A. The Contract Centralization pattern can be applied so that when the new service
capability is added, the Service A service contract will become the primary contact point for
Service A . This will avoid Service Consumer A or any other potential service consumer
from being designed to access the shared database directly. The Service Abstraction
principle can be applied to further hide the implementation details so that Service
Consumer A and other service consumers are unaware of the fact that the shared
database is being accessed.
B. The Legacy Wrapper pattern can be applied to establish a new wrapper utility service
that will provide standardized data access service capabilities for the shared database.
This will avoid Service A from having to access the shared database directly and will further
support the application of the Service Loose Coupling principle between Service A and the
new utility service. By abstracting the data access logic into the wrapper service, there is
no need to add the new service capability to each implementation of Service A .
C. The Standardized Service Contract principle is applied to ensure that the new service
capability is consistently added to the service contract of each implementation and that it
extends the existing Service A service contract in a manner that is compliant with current
design standards. The Service Loose Coupling principle is applied to ensure that the new
service capability remains decoupled from the underlying logic and implementation so that
Service Consumer A does not become indirectly coupled to any new logic or to the shared
database.
D. None of the above.
Answer: C
NEW QUESTION: 3
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. The HDFS cluster is in the safe mode.
B. Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.
C. One physical host crashed.
D. The DataNode JVM on one host is not active.
Answer: A
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 ismarked 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?
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