CentOS 上使用vscode 调试百度大数据分析框架Apache Doris BE

A： 前期准备工作

1. 安装vscode，详细请参见vscode官网https://code.visualstudio.com/docs/setup/linux,摘要如下：

sudo rpm --import https://packages.microsoft.com/keys/microsoft.asc
sudo sh -c 'echo -e "[code]\nname=Visual Studio Code\nbaseurl=https://packages.microsoft.com/yumrepos/vscode\nenabled=1\ngpgcheck=1\ngpgkey=https://packages.microsoft.com/keys/microsoft.asc" > /etc/yum.repos.d/vscode.repo'
yum check-update
sudo yum install code

2. 下载palo源代码，本次是基于0.8.1版本编译的

下载地址为：https://github.com/baidu/palo/archive/v0.8.1-beta.tar.gz

下载第三方依赖包： http://doris-opensource.bj.bcebos.com/doris-thirdparty-20181102.tar.gz?authorization=bce-auth-v1/069fc2786e464e63a5f1183824ddb522/2018-11-02T09:27:57Z/-1/host/b30621ca2be77596cec9477f6cfb3608b681206d73084338d1b2f1204a3e3848

3. 安装GCC 4.8.2+，Oracle JDK 1.8+，Python 2.7+，确认 gcc, java, python 命令指向正确版本, 设置 JAVA_HOME 环境变量

4. 安装其他依赖包

sudo yum install -y gcc-c++ libstdc++-static ant cmake byacc flex automake libtool binutils-devel bison

如果是0.8.2或master版本，还需要执行下面的命令：

ubuntu安装命令为：

sudo apt-get install libssl-dev

Centos安装命令为:

yum install -y openssl-devel

5. step 4安装完成后，执行下述命令

sudo updatedb
yum install redhat-lsb
yum install mlocate

B 编译

以下操作步骤在/home/workspace/palo0.8.1目录下进行

1. 解压A-2下载的0.8.1的源码

tar palo-0.8.-beta.tar.gz -d /home/workspace/palo0.8.1 

2. 解压第三方包到/home/workspace/palo0.8.1/thirdparty/src/ 目录下

tar -zxvf palo-thirdparty-.tar.gz -d /home/workspace/palo0.8.1/thirdparty/src/

3. 编译第三方依赖包

 sh  /home/workspace/palo0.8.1/thirdparty/build-thirdparty.sh

如果是0.8.2版本之后的版本，请修改build-thirdparty.sh的build_brpc函数，加上DPROTOBUF_PROTOC_EXECUTABLE的路径传参，否则在编译BRPC时会找不到protobuf的执行文件，报错

# brpc
build_brpc() {
    check_if_source_exist $BRPC_SOURCE
    if [ ! -f $CMAKE_CMD ]; then
        echo "cmake executable does not exit"
        exit
    fi

    cd $TP_SOURCE_DIR/$BRPC_SOURCE
    mkdir build -p && cd build
    rm -rf CMakeCache.txt CMakeFiles/
    $CMAKE_CMD -v -DBUILD_SHARED_LIBS= -DCMAKE_INSTALL_PREFIX=$TP_INSTALL_DIR \
    -DBRPC_WITH_GLOG=ON -DCMAKE_INCLUDE_PATH="$TP_INSTALL_DIR/include" \
    -DCMAKE_LIBRARY_PATH="$TP_INSTALL_DIR/lib;$TP_INSTALL_DIR/lib64" \
    -DPROTOBUF_PROTOC_EXECUTABLE=$TP_INSTALL_DIR/bin/protoc ..
    make -j$PARALLEL && make install
}

在本人的编译过程中，遇到boost-1.6.4编译无法通过的情况，解决办法为：

cd /home/workspace/palo0.8.1/thirdparty/src/boost_1_64_0
patch -p0 < ../../patches/boost-1.64.-gcc4..patch

执行完成后，重新执行

sh  /home/workspace/palo0.8.1/thirdparty/build-thirdparty.sh

4. 编译palo产品代码

sh /home/workspace/palo0.8.1/build.sh

注意：这个编译有以下几条指令：

sh build.sh  #同时编译be 和fe
sh build.sh  --be #只编译be
sh build.sh  --fe #只编译fe
sh build.sh  --fe --be#同时编译be fe
sh build.sh  --fe --be --clean#删除并同时编译be fe
sh build.sh  --fe  --clean#删除并编译fe
sh build.sh  --be  --clean#删除并编译be
sh build.sh  --be --fe  --clean#删除并同时编译be fe

如果不出意外，应该会编译成功，最终的部署文件将产出到 /home/workspace/palo0.8.1/output/ 目录下。如果还遇到其他问题，可以参照palo的安装文档https://github.com/baidu/palo/wiki/Palo-Install，常见错误一节。

C 部署调试 

1. 给be编译结果文件授权

chmod  /home/workspace/palo0.8.1/output/be/lib/palo_be

注意： /home/workspace/palo0.8.1/output/be/lib/palo_be为be的执行文件，默认编译是带-g的，也就是包含调试符号的。

2. 创建数据存放目录

通过查看/home/workspace/palo0.8.1/output/be/conf/be.conf

# INFO, WARNING, ERROR, FATAL
sys_log_level = INFO

# ports for admin, web, heartbeat service
be_port =
be_rpc_port =
webserver_port =
heartbeat_service_port = 

# Choose one if there are more than one ip except loopback address.
# Note that there should at most one ip match this list.
# If no ip match this rule, will choose one randomly.
# use CIDR format, e.g. 10.10.10.0/
# Default value is empty.
priority_networks = 192.168.1.0/

# data root path, seperate by ';'
storage_root_path = /home/disk1/palo;/home/disk2/palo

# Advanced configurations
# sys_log_dir = ${PALO_HOME}/log
# sys_log_roll_mode = SIZE-MB-
# sys_log_roll_num =
# sys_log_verbose_modules =
# log_buffer_level = -
# palo_cgroups 

需要创建这两个文件夹，这是be数据存放的地方

mkdir -p /home/disk1/palo
mkdir -p /home/disk2/palo

3. 打开vscode，并打开be源码所在目录，在本案例中打开目录为/home/workspace/palo0.8.1/

4. 安装vscode ms c++调试插件

5. 创建launch.json文件，文件内容如下：

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "(gdb) Launch",
            "type": "cppdbg",
            "request": "launch",
            "program": "/home/workspace/palo0.8.1/output/be/lib/palo_be",
            "args": [],
            "stopAtEntry": false,
            "cwd": "/home/workspace/palo0.8.1/",
            "environment": [{"name":"PALO_HOME","value":"/home/workspace/palo0.8.1/output/be/"},
                            {"name":"UDF_RUNTIME_DIR","value":"/home/workspace/palo0.8.1/output/be/lib/udf-runtime"},
                            {"name":"LOG_DIR","value":"/home/workspace/palo0.8.1/output/be/log"},
                            {"name":"PID_DIR","value":"/home/workspace/palo0.8.1/output/be/bin"}
                           ],
            "externalConsole": true,
            "MIMode": "gdb",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ]
        }
    ]
}

其中，environment定义了几个环境变量PALO_HOME  UDF_RUNTIME_DIR LOG_DIR  PID_DIR，这是palo_be运行时需要的环境变量，如果没有设置，启动会失败。

注意：如果希望是attach(附加进程）调试，配置代码如下：

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "(gdb) Launch",
            "type": "cppdbg",
   "request": "attach",
           "program": "/home/workspace/palo0.8.1/output/lib/palo_be",
   "processId":,
        "MIMode": "gdb",
            "internalConsoleOptions":"openOnSessionStart",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ]
        }
    ]
}

配置中 "request": "attach",    "processId":26789，这两个配置节是重点： 分别设置gdb的调试模式为attach，附加进程的processId，否则会失败。如何查找进程id，可以在命令行中输入以下命令：

ps -A | grep palo_be

如图：

其中的26789即为当前运行的be的进程id.

如果当前用户不是root用户，会出现vscode启动gdb失败的情况，实际上vscode attach调试的原理是，启动一个脚本，在这个脚本中启动gdb并attach 到processId,具体脚本形如：

echo $$ > /tmp/Microsoft-MIEngine-Pid-inqdl1a1.ccl ;
cd /opt/doris/output/be/lib ;
DbgTerm=`tty` ;
set -o monitor ;
trap 'rm /tmp/Microsoft-MIEngine-In-ak1nvfsv.e7p
/tmp/Microsoft-MIEngine-Out-zt0opgme.h06
/tmp/Microsoft-MIEngine-Pid-inqdl1a1.ccl
/tmp/Microsoft-MIEngine-Cmd-vfkimaay.df7'
EXIT ;
read -n  -p \"Superuser access is required to attach to a process.
Attaching as superuser can potentially harm your computer. Do you want to continue? [y/N]\" yn;
if [[ ! $yn =~ ^[Yy]$ ]] ; then exit ; fi;
/usr/bin/pkexec /usr/bin/gdb --interpreter=mi --tty=$DbgTerm < /tmp/Microsoft-MIEngine-In-ak1nvfsv.e7p > /tmp/Microsoft-MIEngine-Out-zt0opgme.h06 & clear;
pid=$! ;
echo $pid > /tmp/Microsoft-MIEngine-Pid-inqdl1a1.ccl ;
wait $pid;

但是如果当前用户的权限不是root，就会出现无法启动gdb，vscode无法连接上vscode，启动后毫无反映。解决办法为：

#第一种解决方法
sudo /usr/share/code/code --unity-launch    #默认/root目录作为工作目录
#第2种解决方法
sudo /usr/share/code/code  --user-data-dir  {YOUR SOURCE DIR} 

一个完整的lainch.json的例子如下：

 {
     // Use IntelliSense to learn about possible attributes.
     // Hover to view descriptions of existing attributes.
     // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
     "version": "0.2.0",
     "configurations": [
         {
             "name": "(gdb) Attach",
             "type": "cppdbg",
             "request": "attach",
             "program": "/opt/doris/output/be/lib/palo_be",
             "processId": "${command:pickProcess}",
             "MIMode": "gdb",
             "setupCommands": [
                 {
                     "description": "Enable pretty-printing for gdb",
                     "text": "-enable-pretty-printing",
                     "ignoreFailures": true
                 }
             ]
         },
         {
             "name": "(gdb) Launch",
             "type": "cppdbg",
             "request": "launch",
             "program": "/opt/doris/output/be/lib/palo_be",
             "args": [],
             "stopAtEntry": false,
             "cwd": "/opt/doris/output/be",
             "environment": [
                 {
                     "name": "DORIS_HOME",
                     "value": "/opt/doris/output/be"
                 },
                 {
                     "name": "UDF_RUNTIME_DIR",
                     "value": "/opt/doris/output/be/lib/udf-runtime"
                 },
                 {
                     "name": "LOG_DIR",
                     "value": "/opt/doris/output/be/log"
                 },
                 {
                     "name": "PID_DIR",
                     "value": "/opt/doris/output/be/bin"
                 }
             ],
             "externalConsole": false,
             "MIMode": "gdb",
             "setupCommands": [
                 {
                     "description": "Enable pretty-printing for gdb",
                     "text": "-enable-pretty-printing",
                     "ignoreFailures": true
                 }
             ]
         }
     ]
 }

6. 点击调试即可。