15834891
Beschreibung
Karteikarten von Ermis Wieger, aktualisiert more than 1 year ago
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Erstellt von Ermis Wieger
vor fast 8 Jahre
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| Frage | Antworten |
| What is snitch in cassandra? | Snitch is how the nodes in a cluster know about the topology of the cluster |
| In which file is Snitch configured? | cassandra.yaml |
| What's the deafult snitch configured in cassandra? | Simple Snitch |
| Why is Simple Snitch not a good idea? | All nodes in the same data center and rack. Not working with more than one Datacenter. Old |
| Which file is used to configure Property File Snitch? | cassandra-topology.properties |
| Disadvantage of Property File Snitch method | You must keep files in sync with all nodes in the cluster |
| Which two main groups of snitches exists? | Regular and Cloud Based Snitches |
| What's the most important Regular Snitches? | SimpleSnitch PropertyFileSnitch GossipingPropertyFileSnitch DynamicSnitch |
| What's the most importand Cloud Based Snitches? | Ec2Snitch Ec2MultiRegionSnitch GoogleCloudSnitch CloudstackSnitch |
| Which file is used to configure Gossiping Property File Snitch? | cassandra-rackdc.properties |
| What is the benfit of Gossiping Property File Snitch? | Declare the current node's DC/rack information in a file. Gossip spreads the setting throuh the cluster. No manual copy of the settings to each node neccesary |
| What is Rack Inferring Snitch? | Infers the rack and DC from the IP address |
| What's Dynamic Snitch? | Turned on by default for all snitches! Determines which node to query replicas from depending on node health All snitches biult around Dynamic Snitch |
| What is Gossip? | Gossip os how the nodes in a cluster communicate with each other |
| How does Gossip communicate? | Every one second each node communicates with up to three other nodes exchanging information about itself and all the other nodes that it has information about. |
| How does an external application communicate to cassandra? | CQL or Thrift |
| What is the internal communication method for nodes in a cluster? | Gossip |
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