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From: Viktor Jevdokimov <Viktor.Jevdokimov@adform.com>
To: "user@cassandra.apache.org" <user@cassandra.apache.org>
Subject: RE: Cassandra mad GC
Thread-Topic: Cassandra mad GC
Thread-Index: AQHPESreWBe910q7GU+HDISRDIdfE5qFcRRA
Date: Wed, 15 Jan 2014 08:17:54 +0000
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Simply don't use G1 GC, it will not be better on Cassandra than CMS, it cou=
ld be worse.


Best regards / Pagarbiai

Viktor Jevdokimov
Senior Developer

Email: Viktor.Jevdokimov@adform.com
Phone: +370 5 212 3063
Fax: +370 5 261 0453

J. Jasinskio 16C,
LT-03163 Vilnius,
Lithuania


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delete this message and any copies.-----Original Message-----
From: Dimetrio [mailto:dimetrio@flysoft.ru]
Sent: Tuesday, January 14, 2014 3:16 PM
To: cassandra-user@incubator.apache.org
Subject: Cassandra mad GC

Hi all.
I have many GC freezes on my cassandra cluster

Im using G1 GC and CMS gives similar freezes JVM_OPTS=3D"$JVM_OPTS -XX:+Use=
G1GC"
JVM_OPTS=3D"$JVM_OPTS -XX:SurvivorRatio=3D1"
JVM_OPTS=3D"$JVM_OPTS -XX:NewRatio=3D1"
JVM_OPTS=3D"$JVM_OPTS -XX:MaxTenuringThreshold=3D15"
JVM_OPTS=3D"$JVM_OPTS -XX:-UseAdaptiveSizePolicy"
JVM_OPTS=3D"$JVM_OPTS -XX:G1HeapRegionSize=3D32m"

Heap 8GB
10 nodes aws c3.4xlarge
60Gb per node

Cassandra logs


GC logs


sometimes node freeze and told that one or two nodes are down cpu load > 10=
00% LA =3D 6-15

pending tasks: 4
          compaction type        keyspace           table       completed
total      unit  progress
               Compaction          Social   home_timeline      4097097092
4920701908     bytes    83.26%
               Compaction          Social   home_timeline      2713279974
6272012039     bytes    43.26%
Active compaction remaining time :   0h00m32s

200-300 requests per second on each node with many inserts and deletes (bat=
ch lower than 50)

How can i reduce GC freezes?

--regards


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