Slides from a Cassandra talk at Mountain View
Whats not mentioned in the slide was Garyâ€™s reference to the number of key changes in 0.7 version of Cassandra. He thinks beta would be out in a month and that it will address a lot of issues which is currently keeping a lot of Cassandra users away. Few interesting points
- 0.5, 0.6 use the same version of SSTABLE (to store data on disk), but 0.7 changes that. This will require some kind of migration if 0.7 doesnâ€™t support reading old versions of SSTABLE.
- until now, one needs 50% disk space available (free) to do compaction operation. This might improve with 0.7
- 0.7 would probably have more support for avro (instead of thrift). He wonders why thrift hasnâ€™t caught on
- Vector clocks coming..
- altering keyspace and column families is not possible on a live system todayâ€¦ might change with future version
- Compression is being thought aboutâ€¦
He strongly urged users to use client libraries which abstract out the internals of Cassandraâ€™s internal workings. It was convincing enough for me to investigate a move from cassandraâ€™s java lib, to â€œhectorâ€ for my java application.