What is the maximum number of events that you expect in a day? What is the worst-case scenario?
Mohammed From: cass savy [mailto:casss...@gmail.com] Sent: Wednesday, February 18, 2015 4:21 PM To: user@cassandra.apache.org Subject: Data tiered compaction and data model question We want to track events in log Cf/table and should be able to query for events that occurred in range of mins or hours for given day. Multiple events can occur in a given minute. Listed 2 table designs and leaning towards table 1 to avoid large wide row. Please advice on Table 1: not very widerow, still be able to query for range of minutes for given day and/or given day and range of hours Create table log_Event ( event_day text, event_hr int, event_time timeuuid, data text, PRIMARY KEY ( (event_day,event_hr),event_time) ) Table 2: This will be very wide row Create table log_Event ( event_day text, event_time timeuuid, data text, PRIMARY KEY ( event_day,event_time) ) Datatiered compaction: recommended for time series data as per below doc. Our data will be kept only for 30 days. Hence thought of using this compaction strategy. http://www.datastax.com/dev/blog/datetieredcompactionstrategy Create table 1 listed above with this compaction strategy. Added some rows and did manual flush. I do not see any sstables created yet. Is that expected? compaction={'max_sstable_age_days': '1', 'class': 'DateTieredCompactionStrategy'}
