Table of Contents
Where is the memtable structure stored in Cassandra?
The memtable structure is kept in Java heap memory by default. However, as of Cassandra 2.1, there is the option to store memtable outside of Java heap to alleviate garbage collection (GC) pressure. When the commit log gets full, a flush is triggered and the contents of the memtable are written to disk into an SSTables data file.
How is Cassandra designed to handle big data?
Cassandra is designed to handle “big data” workloads by distributing data, reads and writes (eventually) across multiple nodes with no single point of failure. How does Cassandra work?
How does the memtable work in Apache Cassandra?
When the commit log gets full, a flush is triggered and the contents of the memtable are written to disk into an SSTables data file. At the completion of this process the memtable is cleared and the commit log is recycled. Cassandra automatically partitions these writes and replicates them throughout the cluster.
Is there any support for serializability in Cassandra?
As of version 3.0, Cassandra does not support serializability, or isolation (the “I” in ACID.) Serializability is important in applications where strong data consistency and transactions are required.
How does Cassandra read rack and Datacenter from local node?
Reads rack and datacenter for the local node in cassandra-rackdc.properties file and propagates these values to other nodes via gossip. For migration from the PropertyFileSnitch, uses the cassandra-topology.properties file if it is present.
Which is the default directory for Cassandra in DataStax?
Note: If not set, the default directory is $CASSANDRA_HOME /data/metadata. The directory location where table key and row caches are stored. Properties most frequently used when configuring DataStax Enterprise. Before starting a node for the first time, DataStax recommends that you carefully evaluate your requirements.
Cassandra is designed to handle “big data” workloads by distributing data, reads and writes (eventually) across multiple nodes with no single point of failure. How does Cassandra work?
Where is the cassandra.yaml configuration file located?
The cassandra.yaml configuration file The cassandra.yaml file is the main configuration file for Cassandra. Important: After changing properties in the cassandra.yaml file, you must restart the node for the changes to take effect. It is located in the following directories: