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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. The HDFS cluster is in the safe mode.
B. One physical host crashed.
C. Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.
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 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
A. Option D
B. Option A
C. Option C
D. Option B
E. Option E
Answer: B,C
Explanation:
"TCP is a connection-oriented protocol." http://www.diffen.com/difference/TCP_vs_UDP
NEW QUESTION: 3
Your network contains an Active Directory domain named contoso.com. The domain contains a server named Server1 that runs Windows Server 2012 R2. Server1 has an enterprise root certification authority (CA) for contoso.com.
You deploy another member server named Server2 that runs Windows Server 2012 R2 and has the Web Server (IIS) server role installed.
You need to designate a website on Server1 as the certificate revocation list (CRL) distribution point for the CA. The solution must ensure that CRLs are published automatically to Server2.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
A. Create a file:// CRL distribution point (CDP) entry.
B. Configure an enrollment agent.
C. Create an http:// CRL distribution point (CDP) entry.
D. Configure a CA policy module.
E. Configure a CA exit module.
Answer: C,D
Explanation:
Explanation/Reference:
Explanation:
A: To specify CRL distribution points in issued certificates
Open the Certification Authority snap-in.
In the console tree, click the name of the CA.
On the Action menu, click Properties , and then click the Extensions tab. Confirm that Select
extension is set to CRL Distribution Point (CDP).
Do one or more of the following. (The list of CRL distribution points is in the Specify locations from
which users can obtain a certificate revocation list (CRL) box.)
/To indicate that you want to use a URL as a CRL distribution point Click the CRL distribution point, select the Include in the CDP extension of issued certificates check box, and then click OK .
Click Yes to stop and restart Active Directory Certificate Services (AD CS).
D: You can specify CRL Distribution Points (CDPs) in CAPolicy.inf. Note that any CDP in CAPolicy.inf will take precedence for certificate verifiers over the CDP's specified in the CA policy module.
Note:
CRLDistributionPoint
You can specify CRL Distribution Points (CDPs) for a root CA certificate in the CAPolicy.inf. This section does not configure the CDP for the CA itself. After the CA has been installed you can configure the CDP URLs that the CA will include in each certificate that it issues. The URLs specified in this section of the CAPolicy.inf file are included in the root CA certificate itself.
Example:
[CRLDistributionPoint]
URL=http://pki.wingtiptoys.com/cdp/WingtipToysRootCA.crl
