一.准备

      1. linux或windows上安装elasticsearch

      2.idea导入elasticsearch 对应版本的源码

二.远程调试

     说明: 我的环境是:

       windows 上安装idea 导入 elasticsearch-6.4.1源码
       linux 安装 elasticsearch-6.4.1 

     1. 修改elasticsearch的启动脚本

       在linux  elasticsearch-6.4.1 的安装目录下
       /data/elasticsearch-6.4.1/bin/
      找到elasticsearch脚本
 

#!/bin/bash

# CONTROLLING STARTUP:
#
# This script relies on a few environment variables to determine startup
# behavior, those variables are:
#
#   ES_PATH_CONF -- Path to config directory
#   ES_JAVA_OPTS -- External Java Opts on top of the defaults set
#
# Optionally, exact memory values can be set using the `ES_JAVA_OPTS`. Note that
# the Xms and Xmx lines in the JVM options file must be commented out. Example
# values are "512m", and "10g".
#
#   ES_JAVA_OPTS="-Xms8g -Xmx8g" ./bin/elasticsearch

source "`dirname "$0"`"/elasticsearch-env

ES_JVM_OPTIONS="$ES_PATH_CONF"/jvm.options
JVM_OPTIONS=`"$JAVA" -cp "$ES_CLASSPATH" org.elasticsearch.tools.launchers.JvmOptionsParser "$ES_JVM_OPTIONS"`
ES_JAVA_OPTS="${JVM_OPTIONS//\$\{ES_TMPDIR\}/$ES_TMPDIR} $ES_JAVA_OPTS"

cd "$ES_HOME"
# manual parsing to find out, if process should be detached
if ! echo $* | grep -E '(^-d |-d$| -d |--daemonize$|--daemonize )' > /dev/null; then
  exec \
    "$JAVA" \
    $ES_JAVA_OPTS \
# 添加  java 远程调试代码在这里 
    -agentlib:jdwp=transport=dt_socket,server=y,address=8888,suspend=y \
# 添加结束
    -Des.path.home="$ES_HOME" \
    -Des.path.conf="$ES_PATH_CONF" \
    -Des.distribution.flavor="$ES_DISTRIBUTION_FLAVOR" \
    -Des.distribution.type="$ES_DISTRIBUTION_TYPE" \
    -cp "$ES_CLASSPATH" \
    org.elasticsearch.bootstrap.Elasticsearch \
    "$@"
else
  exec \
    "$JAVA" \
    $ES_JAVA_OPTS \
    -Des.path.home="$ES_HOME" \
    -Des.path.conf="$ES_PATH_CONF" \
    -Des.distribution.flavor="$ES_DISTRIBUTION_FLAVOR" \
    -Des.distribution.type="$ES_DISTRIBUTION_TYPE" \
    -cp "$ES_CLASSPATH" \
    org.elasticsearch.bootstrap.Elasticsearch \
    "$@" \
    <&- &
  retval=$?
  pid=$!
  [ $retval -eq 0 ] || exit $retval
  if [ ! -z "$ES_STARTUP_SLEEP_TIME" ]; then
    sleep $ES_STARTUP_SLEEP_TIME
  fi
  if ! ps -p $pid > /dev/null ; then
    exit 1
  fi
  exit 0
fi

exit $?

注意这3行

# 添加  java 远程调试代码在这里 
    -agentlib:jdwp=transport=dt_socket,server=y,address=8888,suspend=y \
# 添加结束

然后在linux上./elasticsearch 启动elasticsearch
 

等待远程连接中，出现这个表示成功

2.idea配置

打开idea ，打开elasticsearch-6.4.1  编译后源码(没编译的不行)

Edit Configurations

+ -> Remote

填上对应的信息，

记得要设置断点,

elasticsearch-6.4.1的入口main方法在

org.elasticsearch.bootstrap.Elasticsearch main方法中

设置断点

然后点击debug启动调试 

开始调试 ok