Metrics Migration Tool - Cassandra

Stefan Negrea snegrea at redhat.com
Wed Jan 2 23:20:12 UTC 2013


Hello Everybody,


With new Cassandra based metrics storage system, existing data will need to be migrated out of existing SQL storage to Cassandra. I put together a simple design document for the data migration tool that will be delivered with RHQ when the new metrics storage system is completed. 


My initial thoughts about the tool are:
1) Restartable migration process, this will be especially useful for users with large amounts of metrics.
2) Favour robustness over performance because this migration will be done only once.
3) Make the tool external to the product (not part of the installation), so user can do the migration ahead of the upgrade.


Here is the full design document:
https://docs.jboss.org/author/display/RHQ/Metrics+Data+Migration+-+Design


Feedback is more than welcomed since this tool is still in the early planning stages.



Thank you,
Stefan Negrea

Software Engineer



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