Hi all.
I have many GC freezes on my cassandra cluster
Im using G1 GC and CMS gives similar freezes
JVM_OPTS="$JVM_OPTS -XX:+UseG1GC"
JVM_OPTS="$JVM_OPTS -XX:SurvivorRatio=1"
JVM_OPTS="$JVM_OPTS -XX:NewRatio=1"
JVM_OPTS="$JVM_OPTS -XX:MaxTenuringThreshold=15"
JVM_OPTS="$JVM_OPTS -XX:-UseAdaptiveSizePolicy"
JVM_OPTS="$JVM_OPTS -XX:G1HeapRegionSize=32m"
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 > 1000%
LA = 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
(batch lower than 50)
How can i reduce GC freezes?
--regards
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