Grokking the Advanced System Design Interview
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Quiz: Cassandra
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In CAP theorem terms, Cassandra is ___ system?
Choose all correct options
AP (Available and Partition Tolerant)
CP (Consistent and Partition Tolerant)
CA (Consistent and Available Tolerant)
Read repair ALWAYS happens when the consistency level is set to
Choose all correct options
One
Two
Quorum
All
Nodes can only gossip with specific other nodes in the cluster.
Choose all correct options
True
False
Cassandra automatically assigns tokens to Vnodes.
Choose all correct options
True
False
Snitch is used for
Choose all correct options
Communicating with other nodes.
Determining each node's rack and datacenter.
Assigning a leader node in the cluster.
Notifying the coordinator node what partition is down.
When does a client acknowledge the write
Choose all correct options
After writing to the commit log and SSTable
After writing to the MemTable and SSTable
After writing to the MemTable
After writing to the commit log and MemTable
Which of the following are stored and sorted by the clustering columns? Check all that apply
Choose all correct options
Commit log
SSTable
Row cache
MemTable
Which of the following structures are accessed from the disk? Check all that apply.
Choose all correct options
Key cache
SSTable
Bloom filter
Partition index
Partition summary
The partition summary.
Choose all correct options
stores the most recently accessed records.
stores the byte offsets into the partition index.
stores the actual partition.
stores the partition byte offsets in the SSTable.
All tombstones are discarded during compactions.
Choose all correct options
True
False
Which Cassandra consistency level means a majority of the replicas in each datacenter must respond?
Choose all correct options
EACH_QUORUM
ANY
QUORUM
MOST
What is the role of the partitioner?
Choose all correct options
To organize the data together physically on the disk
To hash the partition key to determine the partition token
To physically separate rows into equal-sized columns
To notify the coordinator node what partition is down

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