Hi Experts,
My plan is to upgrade the C* nodes' OS from Centos6 to Centos7.
Since an upgrade wasn't recommended I needed to install new machines with
Centos7 and join them to the cluster.
I didn't want to decommission/bootstrap dozens of nodes, so I decided to do
the following:
- Create a new machine
- Copy all data, schema data and commit logs using rsync from the old
node to the new one
- Stop Cassandra on the old node, copy the delta and shut the node down
- Change the hostname and IP address of the new node to the hostname and
IP of the old node.
- Start Cassandra on the new node.
My thought was that the "new" node will join the cluster as the "old" node
since it has all of its data and metadata, however, after Cassandra started
up, it saw all its peers in DN state. The same goes for the other nodes,
that saw the new node is DN state.
I didn't find any errors or warnings in the logs, but I did see that
the *schema
version* on the new node was different from the others( I'm assuming that's
the issue here?)
*Functioning node*
nodetool describecluster
Cluster Information:
Name: MyCluster
Snitch: org.apache.cassandra.locator.DynamicEndpointSnitch
Partitioner: org.apache.cassandra.dht.Murmur3Partitioner
Schema versions:
503bf151-c59c-35a0-8350-ca73e82098f5: [x.x.x.32, x.x.x.126,
x.x.x.35, x.x.x.1, x.x.x.28, x.x.x.15, x.x.x.252, x.x.x.253, x.x.x.31]
UNREACHABLE: [x.x.x.2]
*New node*
nodetool describecluster
Cluster Information:
Name: MyCluster
Snitch: org.apache.cassandra.locator.DynamicEndpointSnitch
Partitioner: org.apache.cassandra.dht.Murmur3Partitioner
Schema versions:
dab67163-65d4-3895-82e6-ffc07bf5c17a: [x.x.x.2]
UNREACHABLE: [x.x.x.31, x.x.x.1, x.x.x.28, x.x.x.252,
x.x.x.253, x.x.x.15, x.x.x.126, x.x.x.35, x.x.x.32]
I'd really REALLY appreciate some guidance. Did I do something wrong? Is
there a way to fix this?
Thanks a lot!
Shalom Sagges
DBA
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