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Question ID 20609

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?

Option 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.

Option B

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.

Option 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.

Option D

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.

Correct Answer B
Explanation


Question ID 20610

What additional capability does Ganglia provide to that Hadoop alone DOES NOT provide?

Option A

Ability to monitor number of files in HDFS.

Option B

Ability to monitor free task slots.

Option C

Ability to monitor processor utilization.

Option D

 Ability to monitor NameNode memory usage.

Option E

Ability to monitor the amount of free space on HDFS.

Correct Answer C
Explanation

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