| ## |
| # Licensed to the Apache Software Foundation (ASF) under one or more |
| # contributor license agreements. See the NOTICE file distributed with |
| # this work for additional information regarding copyright ownership. |
| # The ASF licenses this file to You under the Apache License, Version 2.0 |
| # (the "License"); you may not use this file except in compliance with |
| # the License. You may obtain a copy of the License at |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| ## |
| |
| ## 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 |
| |
| -Xms2g |
| -Xmx2g |
| |
| ################################################################ |
| ## 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 |
| -XX:+UseSerialGC |
| |
| ## optimizations |
| |
| # pre-touch memory pages used by the JVM during initialization |
| -XX:+AlwaysPreTouch |
| |
| ## basic |
| |
| # force the server VM (remove on 32-bit client JVMs) |
| -server |
| |
| # explicitly set the stack size (reduce to 320k on 32-bit client JVMs) |
| -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 |
| |
| # use old-style file permissions on JDK9 |
| -Djdk.io.permissionsUseCanonicalPath=true |
| |
| # 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 |
| -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} |
| |
| # By default, the GC log file will not rotate. |
| # By uncommenting the lines below, the GC log file |
| # will be rotated every 128MB at most 32 times. |
| #-XX:+UseGCLogFileRotation |
| #-XX:NumberOfGCLogFiles=32 |
| #-XX:GCLogFileSize=128M |
| |
| # 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 |