Adding single token nodes to existing datastax cassandra Cluster and data transfer is not working
sreer...@cordiant.com
Adding a new single token per nodes to existing datastax cluster and data transfer is not working. Process followed is mentioned below. Please update me if the process i followed is wrong.Thanks
We have 3 Single token range datastax nodes in our AWS EC2 Datacenter, both Search and Graph enabled. We are planning to add 3 more nodes into into our datacenter. We are currently using DseSimpleSnitch and Simple network topology for our keyspace.Also our current replication factor is 2.
Node 1 : 10.10.1.36
Node 2 : 10.10.1.46
Node 3 : 10.10.1.56
cat /etc/default/dse | grep -E 'GRAPH_ENABLED=|SOLR_ENABLED='
GRAPH_ENABLED=1
SOLR_ENABLED=1
Datacenter : SearchGraph
Address Rack Status State Load Owns Token
10.10.1.46 rack1 Up Normal 760.14 MiB ? -9223372036854775808
10.10.1.36 rack1 Up Normal 737.69 MiB ? -3074457345618258603
10.10.1.56 rack1 Up Normal 752.25 MiB ? 3074457345618258602
Step (1) For adding 3 new node into our datacenter first we changed our keyspace topology and snitch to network aware.
1)Changed the snitch. cat /etc/dse/cassandra/cassandra.yaml | grep endpoint_snitch: endpoint_snitch: GossipingPropertyFileSnitch
cat /etc/dse/cassandra/cassandra-rackdc.properties |grep -E 'dc=|rack='
dc=SearchGraph
rack=rack1
2) (a) Shut down all the nodes, then restart them.
(b) Run a sequential repair and nodetool cleanup on each node.
3)Changed keyspace topology.
ALTER KEYSPACE tech_app1 WITH REPLICATION = {'class' : 'NetworkTopologyStrategy', 'SearchGraph' : 2};
ALTER KEYSPACE tech_app2 WITH REPLICATION = {'class' : 'NetworkTopologyStrategy', 'SearchGraph' : 2};
ALTER KEYSPACE tech_chat WITH REPLICATION = {'class' : 'NetworkTopologyStrategy', 'SearchGraph' : 2};
Reference : http://docs.datastax.com/en/cassandra/3.0/cassandra/operations/opsChangeKSStrategy.html , http://docs.datastax.com/en/cassandra/3.0/cassandra/operations/opsSwitchSnitch.html
Step (2) For updating token range and setting up new cassandra node, we follow below process.
1) Recalculate token range
root@ip-10-10-1-36:~# token-generator
DC #1:
Node #1: -9223372036854775808
Node #2: -6148914691236517206
Node #3: -3074457345618258604
Node #4: -2
Node #5: 3074457345618258600
Node #6: 6148914691236517202
2) Installed Datastax enterprise same version on new nodes.
3) Stopped the node service and and cleared the data.
4) (a) Assigned token range in following manner to new node.
Node 4: 10.10.2.96 Range: -2
Node 5: 10.10.2.97 Range: 3074457345618258600
Node 6: 10.10.2.86 Range: 6148914691236517202
4) (b) Configured cassandra.yaml on each new node:
Node 4 :
cluster_name: 'SearchGraph'
num_tokens: 1
initial_token: -2
parameters:
- seeds: "10.10.1.46, 10.10.1.56"
listen_address: 10.10.2.96
rpc_address: 10.10.2.96
endpoint_snitch: GossipingPropertyFileSnitch
Node 5 :
cluster_name: 'SearchGraph'
num_tokens: 1
initial_token: 3074457345618258600
parameters:
- seeds: "10.10.1.46, 10.10.1.56"
listen_address: 10.10.2.97
rpc_address: 10.10.2.97
endpoint_snitch: GossipingPropertyFileSnitch
Node 6 :
cluster_name: 'SearchGraph'
num_tokens: 1
initial_token: 6148914691236517202
parameters:
- seeds: "10.10.1.46, 10.10.1.56"
listen_address: 10.10.2.86
rpc_address: 10.10.2.86
endpoint_snitch: GossipingPropertyFileSnitch
5) Changed the snitch.
cat /etc/dse/cassandra/cassandra.yaml | grep endpoint_snitch:
endpoint_snitch: GossipingPropertyFileSnitch
cat /etc/dse/cassandra/cassandra-rackdc.properties |grep -E 'dc=|rack='
dc=SearchGraph
rack=rack1
6) Start DataStax Enterprise on each new node in two minutes intervals with consistent.rangemovement turned off:
JVM_OPTS="$JVM_OPTS -Dcassandra.consistent.rangemovement=false
7) After the new nodes are fully bootstrapped, used nodetool move to assign the new initial_token for existing nodes as per token recalculation done at step 4(a). Process done on each node one at a time.
On Node 1(10.10.1.36) : nodetool move -3074457345618258603
On Node 2(10.10.1.46) : nodetool move -9223372036854775808
On Node 3(10.10.1.56) : nodetool move 3074457345618258602
Datacenter: SearchGraph
Address Rack Status State Load Owns Token
10.10.1.46 rack1 Up Normal 852.93 MiB ? -9223372036854775808
10.10.1.36 rack1 Up Moving 900.12 MiB ? -3074457345618258603
10.10.2.96 rack1 UP Normal 465.02 KiB ? -2
10.10.2.97 rack1 Up Normal 109.16 MiB ? 3074457345618258600
10.10.1.56 rack1 Up Moving 594.49 MiB ? 3074457345618258602
10.10.2.86 rack1 Up Normal 663.94 MiB ? 6148914691236517202