hive脚本分析：加载第三方jar包

1, hive安装目录: hive-env.sh2, 查看hiveserver2脚本启动过程3, 查看hive2运行命令

[root@bigdata4 ~]# tail /export/hive/conf/hive-env.sh
export HADOOP_HEAPSIZE=2048
export HADOOP_CLIENT_OPTS="-Xmx2g -Xms2g -Djava.net.preferIPv4Stack=true $HADOOP_CLIENT_OPTS"
HADOOP_HOME=/export/hadoop
HADOOP_CONF_DIR=/export/common/hadoop/conf
export HIVE_CONF_DIR=/export/common/hive/conf
export HIVE_HOME=/export/hive
export HIVE_AUX_JARS_PATH=/export/server/atlas-hive-hook-v2/

[root@bigdata4 ~]# vim /export/hive/bin/hive
if [ -f "${HIVE_CONF_DIR}/hive-env.sh" ]; then
  . "${HIVE_CONF_DIR}/hive-env.sh"
fi

###1, HIVE_AUX_JARS_PATH是单个目录时: /a/b/c/
if [ -d "${HIVE_AUX_JARS_PATH}" ]; then
  hive_aux_jars_abspath=`cd ${HIVE_AUX_JARS_PATH} && pwd`
  echo $hive_aux_jars_abspath
  
  for f in $hive_aux_jars_abspath/*.jar; do
    AUX_CLASSPATH=${AUX_CLASSPATH}:$f
    if [ "${AUX_PARAM}" == "" ]; then
        AUX_PARAM=file://$f
    else
        AUX_PARAM=${AUX_PARAM},file://$f;
    fi
  done

###2, HIVE_AUX_JARS_PATH是多个指定的jar包文件时: /tmp/a.jar,/tmp/b.jar
elif [ "${HIVE_AUX_JARS_PATH}" != "" ]; then
  HIVE_AUX_JARS_PATH=`echo $HIVE_AUX_JARS_PATH | sed 's/,/:/g'`
  AUX_CLASSPATH=${AUX_CLASSPATH}:${HIVE_AUX_JARS_PATH}
  AUX_PARAM="file://$(echo ${HIVE_AUX_JARS_PATH} | sed 's/:/,file:///g')"
fi  

###3, ${HIVE_HOME}/auxlib/目录存在，并有jar包
# adding jars from auxlib directory
for f in ${HIVE_HOME}/auxlib/*.jar; do
  if [[ ! -f $f ]]; then
      continue;
  fi
  
  AUX_CLASSPATH=${AUX_CLASSPATH}:$f
  if [ "${AUX_PARAM}" == "" ]; then
    AUX_PARAM=file://$f
  else
    AUX_PARAM=${AUX_PARAM},file://$f;
  fi
done 

###4, 最终： AUX_PARAM=file:///tmp/a.jar,/tmp/b.jar

###5, 生成服务启动参数： hive --service hiveserver2 &
if [ "${AUX_PARAM}" != "" ]; then
  if [[ "$SERVICE" != beeline ]]; then
    HIVE_OPTS="$HIVE_OPTS --hiveconf hive.aux.jars.path=${AUX_PARAM}"
  fi
  AUX_JARS_CMD_LINE="-libjars ${AUX_PARAM}"
fi