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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: Differencing test results
Date Sat, 31 Jul 2010 03:34:06 GMT
well, you have two flushes and a compaction there, but none of them lasts
more than a few seconds (out of the half hour period) so i'm guessing that's
not the problem.

On Thu, Jul 29, 2010 at 1:53 AM, Thorvaldsson Justus <
justus.thorvaldsson@svenskaspel.se> wrote:

>  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”
>
>
>
> àHere 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
>
> àHere 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
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

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