Where did you read that bloom filters are off for LCS on 1.1.9? Those are the two issues I can find regarding this matter:
https://issues.apache.org/jira/browse/CASSANDRA-4876 https://issues.apache.org/jira/browse/CASSANDRA-5029 Looks like in 1.2, it defaults at 0.1, not sure about 1.1.X -Wei ----- Original Message ----- From: "Michael Theroux" <mthero...@yahoo.com> To: user@cassandra.apache.org Sent: Thursday, March 7, 2013 1:18:38 PM Subject: Bloom filters and LCS Hello, (Hopefully) Quick question. We are running Cassandra 1.1.9. I recently converted some tables from Size tiered to Leveled Compaction. The amount of space for Bloom Filters on these tables went down tremendously (which is expected, LCS in 1.1.9 does not use bloom filters). However, although its far less, its still using a number of megabytes. Why is it not zero? Column Family: XXXX SSTable count: 526 Space used (live): 7251063348 Space used (total): 7251063348 Number of Keys (estimate): 23895552 Memtable Columns Count: 45719 Memtable Data Size: 21207173 Memtable Switch Count: 579 Read Count: 21773431 Read Latency: 4.155 ms. Write Count: 16183367 Write Latency: 0.029 ms. Pending Tasks: 0 Bloom Filter False Positives: 2442 Bloom Filter False Ratio: 0.00245 Bloom Filter Space Used: 44674656 Compacted row minimum size: 73 Compacted row maximum size: 105778 Compacted row mean size: 1104 Thanks, -Mike
