listen_address is the address that Cassandra will use to connect to other Cassandra nodes. I would make sure that your nodes can communicate on that IP. Specifically, Cassandra will use port 7000 for inter-node communication (7001 if using node-to-node SSL).
How to get the localhost of a node in Cassandra?
If the node is properly configured (host name, name resolution, and so on.), Cassandra uses InetAddress.getLocalHost () to get the local address from the system. Leave set to the default, localhost. Node in a multi-node installations: set this property to the node's IP address or hostname, or set listen_interface.
What is listen_address in DataStax?
The datastax documentation says listen_address¶ (Default: localhost ) The IP address or hostname that other Cassandra nodes use to connect to this node. If left unset, the hostname must resolve to the IP address of this node using /etc/hostname, /etc/hosts , or DNS.
How do I listen to gossip in Cassandra?
Cassandra will bind to the listen_address or listen_interface and listen on the storage_port or ssl_storage_port for gossip. In most cases, these properties may be omitted, resulting in Cassandra binding to the hostname’s IP address (Cassandra uses InetAddress.getLocalHost () ).
What is the default hostname for Cassandra?
(Default: localhost) The IP address or hostname that Cassandra binds to for connecting this node to other nodes. Set this parameter or listen_interface, not both. Correct settings for various use cases: Comment this property out.
What is RPC address in Cassandra?
The address that each Cassandra node shares with clients is the broadcast RPC address; it is controlled by various properties in cassandra. yaml: rpc_address or rpc_interface is the address that the Cassandra process binds to.
What port does Cassandra listen on?
What ports does Cassandra use? By default, Cassandra uses 7000 for cluster communication (7001 if SSL is enabled), 9042 for native protocol clients, and 7199 for JMX.
What is write path in Cassandra?
Write Path Execution in Cassandra : In Cassandra, while writing data, writes are written to any node in the cluster (coordinator). when any user will insert data, it means they write the data first to commit log then to memtable. When any user will write the data, every write will include a timestamp.
Which are configuration files in Cassandra?
The configuration files of Cassandra are located in the /etc/cassandra directory. cassandra. yaml is the file that contains most of the Cassandra configuration, such as ports used, file locations and seed node IP addresses.
How do I connect to Cassandra database?
Apache Cassandra with SSLCreate a Apache Cassandra connection Open data source properties. ... Verify the version of the JDBC driver Verify that you use the JDBC driver of version 1.3, or later. ... Set VM options Open data source properties. ... Add the sslenabled option to the JDBC URL
What is seed node in Cassandra?
A seed node is used to bootstrap the gossip process for new nodes joining a cluster. To learn the topology of the ring, a joining node contacts one of the nodes in the -seeds list in cassandra. yaml. The first time you bring up a node in a new cluster, only one node is the seed node.
What is Memtable and SSTable in Cassandra?
Memtable — a memory cache to store the in memory copy of the data. Each node has a memtable for each CQL table. The memtable accumulates writes and provides read for data which are not yet stored to disk. SSTable —the final destination of data in C*. They are actual files on disk and are immutable.
What are SSTables in Cassandra?
Sorted Strings Table (SSTable) is a persistent file format used by ScyllaDB, Apache Cassandra, and other NoSQL databases to take the in-memory data stored in memtables, order it for fast access, and store it on disk in a persistent, ordered, immutable set of files.
What is Digest in Cassandra?
The digest request checks the data in the replica node to make sure it is up to date. Then the coordinator sends a digest request to all remaining replicas. If any replica nodes have out of date data, a background read repair request is sent.
What is gossip in Cassandra?
Cassandra uses a protocol called gossip to discover location and state information about the other nodes participating in a Cassandra cluster. Gossip is a peer-to-peer communication protocol in which nodes periodically exchange state information about themselves and about other nodes they know about.
What is Nodetool in Cassandra?
The nodetool utility is a command line interface for Cassandra. You can use it to help manage a cluster. In binary installations, nodetool is located in the
What is the role of partitioner in Cassandra?
A partitioner determines how data is distributed across the nodes in the cluster (including replicas). Basically, a partitioner is a function for deriving a token representing a row from its partition key, typically by hashing. Each row of data is then distributed across the cluster by the value of the token.
Does Cassandra use TCP UDP?
Difference Between Hadoop and CassandraS.NO.HADOOPCASSANDRA9It has high latency rate.It has less latency rate.10Hadoop uses TCP and UDP for communication.In Cassandra, gossip protocol is used for communication.11It is for data batch processing.It is for real-time processing.8 more rows•Mar 26, 2020
How do I connect to Cassandra Cqlsh?
After you specify a keyspace, it's added to the prompt.Start the CQL shell: bin/cqlsh. The host information appears. Connected to Test Cluster at 127.0. 0.1:9042. [cqlsh 5.0. 1 | Cassandra 3.3. 0 | CQL spec 3.4. ... Switch to the cycling keyspace: USE cycling; The prompt now includes the keyspace name. cqlsh:cycling>
How many connections can Cassandra handle?
For older Cassandra versions (1.2 and 2.0), the default amount of connections per host are: Local datacenter: two core connection per host, with eight connections as maximum if the simultaneous requests threshold is reached. Remote datacenter: one core connection per host (being two the maximum).
How do I know if Cassandra is running?
Check the status of the Cassandra nodes in your cluster - Go to the /
Main runtime properties
Configuring Cassandra is done by setting yaml properties in the cassandra.yaml file. At a minimum you should consider setting the following properties:
Environment variables
JVM-level settings such as heap size can be set in cassandra-env.sh . You can add any additional JVM command line argument to the JVM_OPTS environment variable; when Cassandra starts, these arguments will be passed to the JVM.
Node to node communication (i.e. gossip)
Cassandra will bind to the listen_address or listen_interface and listen on the storage_port or ssl_storage_port for gossip. In most cases, these properties may be omitted, resulting in Cassandra binding to the hostname’s IP address (Cassandra uses InetAddress.getLocalHost () ).
Client to node communication
By “client” I mean Cassandra drivers and clqsh. The drivers may use the Thrift transport or the Native transport (CQL binary protocol). Cqlsh uses Native transport.
What is the default Mbps for Cassandra?
(Default: 200 Mbps) note Throttle for the throughput of all outbound streaming file transfers on a node. Cassandra does mostly sequential I/O when streaming data during bootstrap or repair. This can saturate the network connection and degrade client (RPC) performance.
How much cache does Cassandra use?
(Default value: empty) note When no value is set, Cassandra uses the smaller of minimum of 2.5% of Heap or 50MB. If your system performs counter deletes and relies on low gc_grace_seconds, you should disable the counter cache. To disable, set to 0.
What is eth0 in Cassandra?
(Default: eth0) note The interface that Cassandra binds to for connecting to other Cassandra nodes. Interfaces must correspond to a single address — IP aliasing is not supported. Do not set values for both listen_address and listen_interface on the same node.
What is Cassandra's default timeout?
(Default: 3600000 - 1 hour) note Enables or disables socket timeout for streaming operations. If a streaming times out by exceeding this number of milliseconds, Cassandra retries it from the start of the current file. Setting this value too low can result in a significant amount of data re-streaming.
How many partitions per batch Cassandra?
(Default: 10 partitions per batch) Causes Cassandra to log a WARN message on any batches not of type LOGGED that span across more partitions than this limit. The default value is 10 partitions.
Does Cassandra use IPv4?
(Default: false) If an interface has an ipv4 and an ipv6 address, Cassandra uses the first ipv4 address by default. Set this property to true to configure Cassandra to use the first ipv6 address.
Does Cassandra take snapshots?
(Default: true) Whether Cassandra takes a snapshot of the data before truncating a keyspace or dropping a table. To prevent data loss, DataStax strongly advises using the default setting. If you set auto_snapshot to false, data loss occurs on truncation or drop.
How do I configure Cassandra to use public IP addresses?
We are using cassandra cluster using private IP address. We are migrating cassandra to different infrastructure and in order to sync data we need to make cassandra to work on public IP address. Is it possible to configure cassandra to use Public IP address and connect over it.
1 Answer
The listen_address is used for internode communication so this is always set to the private IP of the server. The rpc_address is what clients/apps connect to so needs to be set to the public IP address if a server is not accessible to clients on the local network. Configure these in cassandra.yaml:
