2024-06-28

喵星之旅-屯粮的松鼠-es-安装ElasticSearch7.5遇到两个警告解决方法

本机环境centos7、jdk1.8,安装es7.5.

future versions of Elasticsearch will require Java 11; your Java version from [/opt/jdk1.8.0_202/jre] does not meet this requirement

开发时用的是jdk1.8，所示ElasticSearch启动时会有这个提示。

修改bin文件夹下elasticsearch-env

代码如下：

 # now set the path to java
if [ ! -z "$JAVA_HOME" ]; then
  JAVA="$JAVA_HOME/bin/java"
  JAVA_TYPE="JAVA_HOME"
else
  if [ "$(uname -s)" = "Darwin" ]; then
    # macOS has a different structure
    JAVA="$ES_HOME/jdk.app/Contents/Home/bin/java"
  else
    JAVA="$ES_HOME/jdk/bin/java"
  fi
  JAVA_TYPE="bundled jdk"
fi

改为

 # now set the path to java
#if [ ! -z "$JAVA_HOME" ]; then
#  JAVA="$JAVA_HOME/bin/java"
#  JAVA_TYPE="JAVA_HOME"
#else
  if [ "$(uname -s)" = "Darwin" ]; then
    # macOS has a different structure
    JAVA="$ES_HOME/jdk.app/Contents/Home/bin/java"
  else
    JAVA="$ES_HOME/jdk/bin/java"
  fi
  JAVA_TYPE="bundled jdk"
#fi

也就用elasticsearch自带的jdk,不需要下载jdk11了！

OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.

上述问题解决后就会出现这个新问题。

解决办法：

在config文件夹找到jvm.options配置文件

将以下内容：

## GC configuration 
-XX:+UseConcMarkSweepGC
-XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly

改成

## GC configuration 
-XX:+UseG1GC
-XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly

就是只改了一行回收器选择。