Default concurrency values are improperly proportioned ------------------------------------------------------
Key: CASSANDRA-1972 URL: https://issues.apache.org/jira/browse/CASSANDRA-1972 Project: Cassandra Issue Type: Bug Reporter: Stu Hood Assignee: Stu Hood Priority: Minor Fix For: 0.7.1 The "default"/"suggested" {{concurrent_reads}} value is much too low. It assumes that CPU will be the bottleneck, rather than IO, and for most deployments, this will not be the case. Additionally it is better to be queued for IO in the kernel or on your device than in user space, because the former work to optimize queue order. Additionally, reads are much cheaper than writes in terms of CPU time (since writes can experience contention due to retries), so while {{concurrent_writes}} should probably factor in the number of cores on the machine, {{concurrent_reads}} should probably be calculated purely by number of spindles. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.