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I have had some bad experiences with memory mapped databases (particularly Berkeley DB and Tokyo Tyrant) - both these seem to be very greedy with IO writes when

by amix 17y ago

I have had some bad experiences with memory mapped databases (particularly Berkeley DB and Tokyo Tyrant) - both these seem to be very greedy with IO writes when one starts to have lots of data and lots of updates. I think Reddit experienced a similar problem (as memcachedb is based on Berkeley DB). Does anybody know what Cassandra does?

uggedal 17y ago
Take a look at http://wiki.apache.org/cassandra/MemtableThresholds http://wiki.apache.org/cassandra/MemtableThresholds and http://wiki.apache.org/cassandra/ArchitectureOverview#Write_path http://wiki.apache.org/cassandra/ArchitectureOverview#Write_... for the specifics.