Cloudera CCAH CCA-470

TestPDF 的 Cloudera CCA-470題庫是由頂級IT專家團隊以最高技術水平整理製作的，確保了試題的準確性和專業性。這些IT團隊成員都是來自指定認證專家、培訓師和 Cloudera 相關工作從業者，他們對 CCA-470考試內容和 CCAH 認證要求的資歷瞭如指掌，這樣可以確保 CCA-470題庫的高質量。

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1、不需要大量的時間金錢，僅需20-30個小時，自學成才，輕鬆通過Cloudera CCA-470考試。
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3、根據Cloudera CCA-470的考試科目不斷的變化，採取不斷的更新，會提供最新的考試內容。
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最新的 CCAH CCA-470 免費考試真題:

1. Your cluster is running Map v1 (MRv1), with default replication set to 3, and a cluster blocks 64MB. Identify which best describes the file read process when a Client application connects into the cluster and requests a 50MB file?

A) The client queries the NameNode for the locations of the block, and reads all three copies. The first copy to complete transfer to the client is the one the client reads as part of Hadoop's execution framework.
B) The client queries the NameNode for the locations of the block, and reads from a random location in the list it receives to eliminate network I/O loads by balancing which nodes it retrieves data from at any given time.
C) The client queries the NameNode and then retrieves the block from the nearest DataNode to the client and then passes that block back to the client.
D) The client queries the NameNode for the locations of the block, and reads from the first location in the list of receives.

2. You are a Hadoop cluster with a NameNode on host mynamenode. What are two ways to determine available HDFS space in your cluster?

A) Run hadoop dfsadmin -SpaceQuota and subtract HDFS Used from Configured Capacity.
B) Run hadoop fs -du/and locate the DFS Remaining value.
C) Connect to http://mynamemode:50070/ and locate the DFS Remaining value.
D) Run hadoop dfsadmin -report and locate the DFS Remaining value.

3. You observe that the number of spilled records from map tasks for exceeds the number of map output records. You child heap size is 1 GB and your io.sort.mb value is set to 100MB. How would you tune your io.sort.mb value to achieve maximum memory to disk I/O ratio?

A) Decrease the io.sort.mb value below 100M
B) Increase the IO.sort.mb as high you can, as close to 1GB as possible.
C) For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.
D) Tune io.sort.mb value until you observe that the number of spilled records equals (or is as close to equals) the number of map output records.

4. A client wants to read a file from HDFS. How does the data get from the DataNodes to the client?

A) The NameNode reads the blocks from the DataNodes, and caches them. Then, the application reads the blocks from the NameNode.
B) The application reads the blocks directly from the DataNodes.
C) The blocks are sent to a single DataNode, then the application reads the blocks from that Data Node.

5. Someone in your data center unplugs a slave node by accident. Users of the cluster notice via the Hadoop Web UI that the cluster size has shrunken and express concerns about data loss and HDFS performance. The replication factor of all the files in the cluster is unchanged from the default of 3. What can you tell the users?

A) The HDFS filesystem is corrupt until the administrator re adds the DataNode to the cluster. The warnings associated with the event should be reported.
B) The NameNode will identify the outage and re-replicate the data when the clients receive connection failures to the DataNode, so the end users can disregard such warnings.
C) The NameNode will re replicate the data after the administrator issues a special command. The data is not lost but is underreplicated until the administrator issues this command.
D) After identifying the outage, the NameNode will naturally re-replicate the data and there will be no data loss. The administrator can re-add the DataNode at any time. The client can disregard warnings concerned with this event. Data will be under-replicated but will become properly replicated over time.

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