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NEW QUESTION: 1
Which two updates occur when a client application opens a stream to begin a file write on a cluster running MapReduce v1 (MRv1)?
A. Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.
B. The change is written to the edits file.
C. The metadata in RAM on the NameNode is updated.
D. The change is written to the NameNode disk.
E. The metadata in the RAM on the NameNode is flushed to disk.
F. The metadata in RAM on the NameNode is flushed disk.
Answer: B,F
Explanation:
Note:Namenode stores modifications to the filesystem as a log appended to a native filesystem file (edits). When a Namenode starts up, it reads HDFS state from an image file (fsimage) and then applies edits from edits log file. It then writes new HDFS state to (fsimage) and starts normal operation with an empty edits file. Since namenode merges fsimage and edits files only during start up, edits file could get very large over time on a large cluster. Another side effect of larger edits file is that next restart of Namenade takes longer.
The secondary namenode merges fsimage and edits log periodically and keeps edits log size with in a limit. It is usually run on a different machine than the primary Namenode since its memory requirements are on the same order as the primary namemode. The secondary namenode is started by bin/start-dfs.sh on the nodes specified in conf/masters file.
NEW QUESTION: 2
Which service would you use to see CPU usage?
Choose the correct answer:
A. CloudWatch
B. None of the above
C. CloudTrail
D. Config
Answer: A
NEW QUESTION: 3
An application running on Amazon EC2 instances generates log files in a folder on a Linux file system. The instances block access to the console and file transfer utilities, such as Secure Copy Protocol (SCP) and Secure File Transfer Protocol (SFTP). The Application Support team wants to automatically monitor the application log files so the team can set up notifications in the future.
A Security Engineer must design a solution that meets the following requirements:
* Make the log files available through an AWS managed service.
* Allow for automatic monitoring of the logs.
* Provide an Interlace for analyzing logs.
* Minimize effort.
Which approach meets these requirements