Hi,
I have a 3 nodes cluster with 18 GB RAM and 2 GB swap.
Each node have the following JVMs (Xms=Xmx) :
- Zookeeper 2GB
- Kafka 12 GB
- Kafka mirror-maker DCa 1 GB
- Kafka mirror-maker DCb 1 GB
All th JVMs consume 16 GB. It leaves 2 GB for the OS (debian jessie 64
bits).
Why i have no swap free on these virtual machines ?
#free -m
total used free shared buffers cached
Mem: 18105 17940 164 0 38 6666
-/+ buffers/cache: 11235 6869
Swap: 2047 2045 2
I've read i should avoid jvm swapping.
What is the best way to do that ?
- modify swapiness threshold
- unmount all swap partition
- force the jvm to stay in memory with mlockall (
https://github.com/LucidWorks/mlockall-agent)
- Other solution
Gabriel.
