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From Apache Wiki <>
Subject [Cassandra Wiki] Update of "PerformanceTuning" by FlipKromer
Date Tue, 31 Aug 2010 04:10:14 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for change notification.

The "PerformanceTuning" page has been changed by FlipKromer.


+ = Improving write performance =
+  1. Make sure your commit log and data dirs (sstables) are on different disks.
+  1. There isn't really a step 2.  Writes go into the commitlog (fast) and straight into
memory (really fast) and can't really be sped up beyond that.
+ If you're seeing huge latency spikes under write-heavy loads, that's due to other factors.
It's a 'fix what has gone horribly wrong' problem, not a 'tune for better peak performance'
+ = Improving read performance =
  Be sure to review the page on [[MemtableThresholds|Memtable Thresholds]] -- several important
configuration and system settings are described there.
  === Lessen overall system impact of Compactions ===

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