## JVM configuration
{% if (not (elasticsearch_node_master | default(master_node)) | bool) and (not (elasticsearch_node_data | default(data_node)) | bool) %}
{%   set heap_size = (elastic_heap_size_default | int) // 2 %}
{% else %}
{%   set heap_size = (elastic_heap_size_default | int) %}
{% endif %}
# Xms represents the initial size of total heap space
-Xms{{ heap_size }}m
# Xmx represents the maximum size of total heap space
-Xmx{{ heap_size }}m
# Sets the thread stack size
-Xss1m

################################################################
## Expert settings
################################################################
##
## All settings below this section are considered
## expert settings. Don't tamper with them unless
## you understand what you are doing
##
################################################################

## GC Configuration
{% if ((heap_size | int) > 6144) and (elastic_g1gc_enabled | bool) %}
-XX:+UseG1GC
-XX:MaxGCPauseMillis=400
-XX:InitiatingHeapOccupancyPercent=75
{% else %}
-XX:+UseParNewGC
-XX:+UseConcMarkSweepGC
-XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly
{% endif %}

## optimizations

# disable calls to System#gc
-XX:+DisableExplicitGC

## locale
# Set the locale language
#-Duser.language=en

# Set the locale country
#-Duser.country=US

# Set the locale variant, if any
#-Duser.variant=

## basic

# set the I/O temp directory
-Djava.io.tmpdir={{ temp_dir }}

# set to headless, just in case
-Djava.awt.headless=true

# ensure UTF-8 encoding by default (e.g. filenames)
-Dfile.encoding=UTF-8

# use our provided JNA always versus the system one
#-Djna.nosys=true

## heap dumps

# generate a heap dump when an allocation from the Java heap fails
# heap dumps are created in the working directory of the JVM
-XX:+HeapDumpOnOutOfMemoryError

# specify an alternative path for heap dumps
# ensure the directory exists and has sufficient space
#-XX:HeapDumpPath=${LOGSTASH_HOME}/heapdump.hprof

## GC logging
#-XX:+PrintGCDetails
#-XX:+PrintGCTimeStamps
#-XX:+PrintGCDateStamps
#-XX:+PrintClassHistogram
#-XX:+PrintTenuringDistribution
#-XX:+PrintGCApplicationStoppedTime

# log GC status to a file with time stamps
# ensure the directory exists
#-Xloggc:${LS_GC_LOG_FILE}

#listen on IPv4 addresses
-Djava.net.preferIPv4Stack=true

# Disable log4j because its not supported by elastic
-Dlog4j2.disable.jmx=true