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Topic: Apache Cassandra |
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EricJ
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| Apache Cassandra |
Apache Cassandra is an open source distributed NOSQL database designed to handle large amounts of data across many commodity servers, providing high availability with no single point of failure.
Major features:
Large scalability -- achieved by distributed partitions
High availability -- achieved by multiple nodes
Fault-tolerance -- achieved by non-master-slave replicas with no single point of failure
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EricJ
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| How to download and install Cassandra? |
Step 1. Get the Apache Cassandra
Go to: http://cassandra.apache.org/download/
Click on: apache-cassandra-2.2.1-bin.tar.gz
Use 7-zip to extract files into: C:\temp\apache-cassandra-2.2.1-bin.tar\
Use 7-zip to extract files into: C:\tmp\apache-cassandra-2.2.1-bin\
Move the folder to: C:\downloads\apache-cassandra-2.2.1
Step 2. Set the Cassandra environment
JAVA_HOME = C:\Program Files\Java\jdk1.7.0_25
CASSANDRA_HOME = C:\downloads\apache-cassandra-2.2.1
PATH = C:\downloads\apache-cassandra-2.2.1\bin
Step 3. Start server
C:\downloads\apache-cassandra-2.2.1\bin>cassandra -f
Step 4. Check Server/node status
How do I know Cassandra is running or not?
C:\downloads\apache-cassandra-2.2.1\bin> nodetool status
Starting NodeTool
Datacenter: datacenter1
========================
Status=Up/Down|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
UN 127.0.0.1 11.41 MB 256 ? 4571f3b-51807 rack1
As it can be seen that the node is "Up" AND "Normal".
Step 5. Stop server
Simply by Ctrl+C
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EricJ
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| How to customize/Configure Cassandra |
Open C:\downloads\apache-cassandra-2.2.1\conf\cassandra.yaml:
Change the following default settings:
cluster_name: 'Test Cluster'
listen_address: localhost
rpc_address: localhost
- seeds: "127.0.0.1"
to:
cluster_name: 'Cluster101'
listen_address: 10.11.12.13
rpc_address: 10.11.12.13
– seeds: "10.11.12.13"
C:\downloads\apache-cassandra-2.2.1\bin> nodetool status
Starting NodeTool
Datacenter: datacenter1
========================
Status=Up/Down|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
UN 10.11.12.13 11.41 MB 256 ? 4571f3b-51807 rack1
As it can be seen that this Cassandra is running on 10.11.12.13 which can be accessed from outside.
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EricJ
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| How to add a new node into existing cluster? |
Setp 1. Download and install Cassandra package unto the new host
Step 2. Configure the new Cassandra node:
Change:
cluster_name: 'Test Cluster'
listen_address: localhost
rpc_address: localhost
- seeds: "127.0.0.1"
to:
cluster_name: 'Clusetr101' <-- The cluster to join
listen_address: 10.11.12.123
rpc_address: 10.11.12.123
– seeds: "10.11.12.13" <-- The cluster's seeds to reference
Step 3. Start the new node:
C:\downloads\apache-cassandra-2.2.1\bin> cassandra -f
Step 4. Check the status:
C:\downloads\apache-cassandra-2.2.1\bin> nodetool status
Starting NodeTool
Datacenter: datacenter1
========================
Status=Up/Down|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
UN 10.11.12.13 11.51 MB 256 ? 4571f3b-51807 rack1
UN 10.11.12.123 4.32 MB 256 ? 8f1b1c8-2d0d6 rack1
As it can be seen that the cluster is now having 2 nodes: '10.11.12.13' and '10.11.12.123'.
Note: Check your application data's replication factor before adding any new node, for example,
ReplicationFactor=1 -- trouble if any one node is down
ReplicationFactor=2 -- trouble if any two nodes are down
UnavailableException: Not enough replica available for query at consistency ONE (1 required but only 0 alive)
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EricJ
member
offline |
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| posts: |
50 |
| joined: |
02/22/2007 |
| from: |
CA |
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| Is it possible to set up a multi-node cluster on a single machine |
It seams to be possible based on the following link
http://stackoverflow.com/questions/22513979/setting-up-cassandra-multi-node-cluster-on-a-single-ubuntu-server
In summary:
Multiple folders for each instance;
Within each folder's yaml file, set 'localhost' as '127,0,0,1', '127,0,0,2', ..., respectively.
Within each folder's cassandra-env.sh file, set 'JMX_PORT' as 7199, 8199, ..., respectively.
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posted on: 09/29/2015 02:23:29 AM
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