ElasticSearch5.0中Jvm的配置

配置文件路径：config/jvm.options

## JVM configuration

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## IMPORTANT: JVM heap size

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##

## 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

-Xms2g

-Xmx2g

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## Expert settings

################################################################

##

## All settings below this section are considered

## expert settings. Don’t tamper with them unless

## you understand what you are doing

##

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## GC configuration

-XX:+UseConcMarkSweepGC

-XX:CMSInitiatingOccupancyFraction=75

-XX:+UseCMSInitiatingOccupancyOnly

## optimizations

# disable calls to System#gc

-XX:+DisableExplicitGC

# pre-touch memory pages used by the JVM during initialization

-XX:+AlwaysPreTouch

## basic

# force the server VM

-server

# 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

# flags to keep Netty from being unsafe

-Dio.netty.noUnsafe=true

-Dio.netty.noKeySetOptimization=true

# log4j 2

-Dlog4j.shutdownHookEnabled=false

-Dlog4j2.disable.jmx=true

-Dlog4j.skipJansi=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=${heap.dump.path}

## 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:${loggc}

# Elasticsearch 5.0.0 will throw an exception on unquoted field names in JSON.

# If documents were already indexed with unquoted fields in a previous version

# of Elasticsearch, some operations may throw errors.

#

# WARNING: This option will be removed in Elasticsearch 6.0.0 and is provided

# only for migration purposes.

#-Delasticsearch.json.allow_unquoted_field_names=true