What is Hadoop’s block placement policy, assuming a block replication factor of three?
Your cluster has nodes in seven racks, and you have provided a rack topology script. What is
Hadoop’s block placement policy, assuming a block replication factor of three?
What is the effect of a second client requesting a file during a write?
Your cluster Mode size is set to 128MB. A client application (client application A) is writing a
500MB file to HDFS. After client application A has written 300MB of data, another client (client
application B) attempts to read the file. What is the effect of a second client requesting a file during
a write?
What does this tell you about the file?
In HDFS, you view a file with rw-r–r– set as its permissions. What does this tell you about the file?
which order will these rows be retrieved from a scan?
You have a table with the following rowkeys:
r1, r2, r3, r10, r15, r20, r25, r30, r35
In which order will these rows be retrieved from a scan?
which of the following orders?
Data is written to the HLog in which of the following orders?
Which of the remaining HMasters becomes the new primary?
You have two standbys and one primary HMaster. Your primary HMaster fails. Which of the
remaining HMasters becomes the new primary?
which feature of HBase ensures that data won’t be lost in the event of a RegionServer failure?
Under default settings, which feature of HBase ensures that data won’t be lost in the event of a
RegionServer failure?
What action occurs automatically on a cluster when a DataNode is marked as dead?
What action occurs automatically on a cluster when a DataNode is marked as dead?
You need to create a "WebLogs" table in HBase
You need to create a “WebLogs” table in HBase. The table will consist of a single Column Family
called “Errors” and two column qualifiers, “IP” and “URL”. The shell command you should use to
create the table is:
What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes
What two processes must you do if you are running a Hadoop cluster with a single NameNode
and six DataNodes, and you want to change a configuration parameter so that it affects all six
DataNodes.