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## JVM configuration | |
################################################################ | |
## IMPORTANT: JVM heap size | |
################################################################ | |
## | |
## You should always set the min and max JVM heap | |
## size to the same value. For example, to set | |
## the heap to 4 GB, set: | |
## | |
## -Xms4g | |
## -Xmx4g | |
## | |
## See https://www.elastic.co/guide/en/elasticsearch/reference/current/heap-size.html | |
## for more information | |
## | |
################################################################ | |
# Xms represents the initial size of total heap space | |
# Xmx represents the maximum size of total heap space | |
-Xms30g | |
-Xmx30g | |
################################################################ | |
## 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 | |
# -XX:+UseConcMarkSweepGC | |
# -XX:CMSInitiatingOccupancyFraction=75 | |
# -XX:+UseCMSInitiatingOccupancyOnly | |
## G1GC Configuration | |
# NOTE: G1GC is only supported on JDK version 10 or later. | |
# To use G1GC uncomment the lines below. | |
10-:-XX:-UseConcMarkSweepGC | |
10-:-XX:-UseCMSInitiatingOccupancyOnly | |
10-:-XX:+UseG1GC | |
10-:-XX:G1ReservePercent=25 | |
10-:-XX:InitiatingHeapOccupancyPercent=30 | |
## DNS cache policy | |
# cache ttl in seconds for positive DNS lookups noting that this overrides the | |
# JDK security property networkaddress.cache.ttl; set to -1 to cache forever | |
-Des.networkaddress.cache.ttl=60 | |
# cache ttl in seconds for negative DNS lookups noting that this overrides the | |
# JDK security property networkaddress.cache.negative ttl; set to -1 to cache | |
# forever | |
-Des.networkaddress.cache.negative.ttl=10 | |
## optimizations | |
# pre-touch memory pages used by the JVM during initialization | |
-XX:+AlwaysPreTouch | |
## basic | |
# explicitly set the stack size | |
-Xss1m | |
# 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 | |
# turn off a JDK optimization that throws away stack traces for common | |
# exceptions because stack traces are important for debugging | |
-XX:-OmitStackTraceInFastThrow | |
# flags to configure Netty | |
-Dio.netty.noUnsafe=true | |
-Dio.netty.noKeySetOptimization=true | |
-Dio.netty.recycler.maxCapacityPerThread=0 | |
# log4j 2 | |
-Dlog4j.shutdownHookEnabled=false | |
-Dlog4j2.disable.jmx=true | |
-Djava.io.tmpdir=${ES_TMPDIR} | |
## 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=data | |
# specify an alternative path for JVM fatal error logs | |
-XX:ErrorFile=logs/hs_err_pid%p.log | |
## JDK 8 GC logging | |
8:-XX:+PrintGCDetails | |
8:-XX:+PrintGCDateStamps | |
8:-XX:+PrintTenuringDistribution | |
8:-XX:+PrintGCApplicationStoppedTime | |
8:-Xloggc:logs/gc.log | |
8:-XX:+seGCLogFileRotation | |
8:-XX:NumberOfGCLogFiles=32 | |
8:-XX:GCLogFileSize=64m | |
# JDK 9+ GC logging | |
9-:-Xlog:gc*,gc+age=trace,safepoint:file=logs/gc.log:utctime,pid,tags:filecount=32,filesize=64m | |
# due tointernationalization enhancements in JDK 9 Elasticsearch need to set the provider to COMPAT otherwise | |
# time/date parsing will break in an incompatible way for some date patterns and locals | |
9-:-Djava.locale.providers=COMPAT |
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