[CASSANDRA-2148] system CFs default to large memtable throughputs on large heaps

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 0.7.1
• Severity: Normal
• Assignee: Matthew F. Dennis
• Reporter: Matthew F. Dennis

Authors

Matthew F. Dennis

• Created: 09/Feb/11 21:09
• Updated: 16/Apr/19 09:33
• Resolved: 09/Feb/11 23:45

Description

The default memtableThroughputInMB is calculated now based on the heap size. Most people running with a large heap in production explicitly set it for their memtable(s). However, the the CFs in the system keyspace still default to the calculated value which on a large heap can be quite large. HintsColumnFamily is really the only problematic one though as the others are flushed afters changes to them.

we should:

1) set the throughput on the hints CF to a reasonable max and min value - min(256, max(32, normalDefault/2))
2) set the throughput on the other system CFs to some small constant value (just as a safety); 8M sounds good