升级cassandra

Question

我正在使用cassandra 0.6.8并且我想将cassandra 0.6.8升级到Cassandra 0.7，它会影响我目前拥有的数据吗？

Answer 1

NEWS.txt始终涵盖升级：

升级

The Thrift API has changed in incompatible ways; see below, and refer
to http://wiki.apache.org/cassandra/ClientOptions for a list of
higher-level clients that have been updated to support the 0.7 API.

The Cassandra inter-node protocol is incompatible with 0.6.x
releases (and with 0.7 beta1), meaning you will have to bring your
cluster down prior to upgrading: you cannot mix 0.6 and 0.7 nodes.

The hints schema was changed from 0.6 to 0.7. Cassandra automatically
snapshots and then truncates the hints column family as part of 
starting up 0.7 for the first time.

Keyspace and ColumnFamily definitions are stored in the system
keyspace, rather than the configuration file.

The process to upgrade is:
1) run "nodetool drain" on _each_ 0.6 node.  When drain finishes (log
   message "Node is drained" appears), stop the process.
2) Convert your storage-conf.xml to the new cassandra.yaml using 
   "bin/config-converter".  
3) Rename any of your keyspace or column family names that do not adhere
   to the '^\w+' regex convention.
4) Start up your cluster with the 0.7 version.
5) Initialize your Keyspace and ColumnFamily definitions using 
   "bin/schematool <host> <jmxport> import".  _You only need to do 
   this to one node_.

Answer 2

是的，它会的。 在我看来，你必须通过在java或其他编程中编写一些代码来手动将数据从0.6移动到0.7。