I can’t add tracing using driver – Usergrid code is way too complex. When I look at logging the slow queries on the C* side, it says the feature is added in version 3.10 (https://issues.apache.org/jira/browse/CASSANDRA-12403), and we use 3.7. Any other ways to log slow queries in this version? Or, what do we expect with this log output?
From: benjamin roth [mailto:brs...@gmail.com] Sent: Monday, April 17, 2017 5:44 PM To: user@cassandra.apache.org Subject: RE: Counter performance You could enable a slow query log and then trace single queries couldn't you? Am 17.04.2017 16:31 schrieb "Eren Yilmaz" <eren.yil...@sebit.com.tr<mailto:eren.yil...@sebit.com.tr>>: I can’t trace selects on the application tables unfortunately. The application is Usergrid, and it stores the data in binary. We have little control over Usergrid-created data. From: benjamin roth [mailto:brs...@gmail.com<mailto:brs...@gmail.com>] Sent: Monday, April 17, 2017 4:12 PM To: user@cassandra.apache.org<mailto:user@cassandra.apache.org> Subject: Re: Counter performance Do you see difference when tracing the selects? 2017-04-17 13:36 GMT+02:00 Eren Yilmaz <eren.yil...@sebit.com.tr<mailto:eren.yil...@sebit.com.tr>>: Application tables use LeveledCompactionStrategy. At first, counter tables were created by default SizeTieredCompactionStrategy, but we changed them to LeveledCompactionStrategy then. compaction = { 'class' : 'org.apache.cassandra.db.compaction.LeveledCompactionStrategy', 'sstable_size_in_mb' : 512 } From: benjamin roth [mailto:brs...@gmail.com<mailto:brs...@gmail.com>] Sent: Monday, April 17, 2017 12:12 PM To: user@cassandra.apache.org<mailto:user@cassandra.apache.org> Subject: Re: Counter performance Do you have a different compaction strategy on the counter tables? 2017-04-17 10:07 GMT+02:00 Eren Yilmaz <eren.yil...@sebit.com.tr<mailto:eren.yil...@sebit.com.tr>>: We are using Cassandra (3.7) counter tables in our application, and there are about 10 counter tables. The counter tables are in a separate keyspace with RF=3 (total 10 nodes). The tables are read-heavy, for each web request to the application, we read at least 20 counter values. The counter reads are very slow comparing to the other application data reads from cassandra, and sometimes the reads put extra heavy CPU load on some nodes. Are there any tips, or best practices for increasing the performance of counter tables?
