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From Thorvaldsson Justus <justus.thorvalds...@svenskaspel.se>
Subject Differencing test results
Date Thu, 29 Jul 2010 06:53:58 GMT
I am testing on one node only right now and simply adding data and reading it.
There is no real problem but I feel I get differencing results from the tests depending on
something I would like to know what it is.
What is happening between two "points in time"

-->Here is a point with Slower result
INFO 08:12:02,113 Creating new commitlog segment /srv/cassandra/commitlog/CommitLog-1280383922113.log
 INFO 08:12:06,872 Completed flushing /srv/cassandra/data/MyGames/Game1-207-Data.db
 INFO 08:12:11,950 Compacted to /srv/cassandra/data/MyGames/EssentialGame1-57-Data.db.  321936296/319836199
bytes for 2000 keys.  Time: 10659ms.
 INFO 08:13:23,221 Creating new commitlog segment /srv/cassandra/commitlog/CommitLog-1280384003221.log
 INFO 08:13:24,401 Game1 has reached its threshold; switching in a fresh Memtable at CommitLogContext(file='/srv/cassandra/commitlog/CommitLog-1280384003221.log',
position=7180218)
 INFO 08:13:24,402 Enqueuing flush of Memtable-Game1@2027049345(65162130 bytes, 3145758 operations)
 INFO 08:13:24,406 Writing Memtable-Game1@2027049345(65162130 bytes, 3145758 operations)
 INFO 08:13:28,365 Completed flushing /srv/cassandra/data/MyGames/Game1-208-Data.db
 INFO 08:13:35,327 Deleted /srv/cassandra/data/MyGames/EssentialGame1-56-Data.db
 INFO 08:13:35,348 Deleted /srv/cassandra/data/MyGames/EssentialGame1-52-Data.db
 INFO 08:13:35,369 Deleted /srv/cassandra/data/MyGames/EssentialGame1-53-Data.db
 INFO 08:13:35,390 Deleted /srv/cassandra/data/MyGames/EssentialGame1-55-Data.db
 INFO 08:38:47,378 Creating new commitlog segment /srv/cassandra/commitlog/CommitLog-1280385527378.log
 INFO 08:49:03,295 Game1 has reached its threshold; switching in a fresh Memtable at CommitLogContext(file='/srv/cassandra/commitlog/CommitLog-1280385527378.log',
position=25079957)
 INFO 08:49:03,296 Enqueuing flush of Memtable-Game1@1607706649(65162710 bytes, 3145786 operations)
 INFO 08:49:03,296 Writing Memtable-Game1@1607706649(65162710 bytes, 3145786 operations)
 INFO 08:49:07,948 Completed flushing /srv/cassandra/data/MyGames/Game1-209-Data.db
 INFO 08:49:07,949 Compacting [org.apache.cassandra.io.SSTableReader(path='/srv/cassandra/data/MyGames/Game1-206-Data.db'),org.apache.cassandra.io.SSTableReader(path='/srv/cassandra/data/MyGames/Game1-207-Data.db'),org.apache.cassandra.io.SSTableReader(path='/srv/cassandra/data/MyGames/Game1-208-Data.db'),org.apache.cassandra.io.SSTableReader(path='/srv/cassandra/data/MyGames/Game1-209-Data.db')]
 INFO 08:49:23,920 Compacted to /srv/cassandra/data/MyGames/Game1-210-Data.db.  443120374/443120374
bytes for 898844 keys.  Time: 15970ms.
 INFO 08:50:17,479 Creating new commitlog segment /srv/cassandra/commitlog/CommitLog-1280386217479.log
-->Here is a point with faster result again

This is no absolute position in time, but I would like to know because I could probably configure
Cassandra better.
Regards from Sweden
Justus Thorvaldsson

AB SVENSKA SPEL
106 10 Stockholm
Sturegatan 11, Sundbyberg
Växel +46 8 757 77 00
http://svenskaspel.se

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