cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Philip Persad <philip.per...@gmail.com>
Subject Replicating Data Between Separate Data Centres
Date Mon, 14 Dec 2015 19:59:33 GMT
Hi,

I'm currently looking at Cassandra in the context of Disaster Recovery.  I
have 2 Data Centres, one is the Primary and the other acts as a Standby.
There is a Cassandra cluster in each Data Centre.  For the time being I'm
running Cassandra 2.0.9.  Unfortunately, due to the nature of my data, the
consistency levels that I would get out of LOCAL_QUORUM writes followed by
asynchronous replication to the secondary data centre are insufficient.  In
the event of a failure, it is acceptable to lose some data, but I need
Casual Consistency to be maintained.  Since I don't have the luxury of
performing nodetool repairs after Godzilla steps on my primary data centre,
I use more strictly ordered means of transporting events between the Data
Centres (Kafka for anyone who cares about that detail).

What I'm not sure about, is how to go about copying all the data in one
Cassandra cluster to a new cluster, either to bring up a new Standby Data
Centre or as part of failing back to the Primary after I pick up the
pieces.  I'm thinking that I should either:

1. Do a snapshot (
https://docs.datastax.com/en/cassandra/2.0/cassandra/operations/ops_backup_takes_snapshot_t.html),
and then restore that snapshot on my new cluster (
https://docs.datastax.com/en/cassandra/2.0/cassandra/operations/ops_snapshot_restore_new_cluster.html
)

2. Join the new data centre to the existing cluster (
https://docs.datastax.com/en/cassandra/2.0/cassandra/operations/ops_add_dc_to_cluster_t.html).
Then separate the two data centres into two individual clusters by doing .
. . something???

Does anyone have any advice about how to tackle this problem?

Many thanks,

-Phil

Mime
View raw message