spark相关脚本解析

spark-shell/spark-submit/pyspark等关系如下：

#spark-submit 逻辑:

################################################

#从spark-shell调用之后，传进来--class org.apache.spark.repl.Main --name "Spark shell" --master spark://ip:7077
#先检测spark_home,然后去调用spark_home/bin/spark-class 会将org.apache.spark.deploy.SparkSubmit作为第一个参数，
#----- 会执行脚本spark-class org.apache.spark.deploy.SparkSubmit --class org.apache.spark.repl.Main --name"Spark shell" --master spark://ip:7077

#####################################

#!/usr/bin/env bash

if [-z "${SPARK_HOME}" ]; then

  export SPARK_HOME="$(cd "`dirname"$0"`"/..; pwd)"

fi

#disable randomized hash for string in Python 3.3+

exportPYTHONHASHSEED=

#exec 执行完面的命令，exec 命令，是创建一个新的进程，只不过这个进程与前一个进程的ID是一样的。

#这样，原来的脚本剩余的部分代码就不能执行了，因为相当于换了一个进程。

exec "${SPARK_HOME}"/bin/spark-class org.apache.spark.deploy.SparkSubmit " $@"

#以下是spark-class逻辑:
###########################################################################

#--如果是spark-shell从spark-submit脚本传进来如下参数：

org.apache.spark.deploy.SparkSubmit --classorg.apache.spark.repl.Main --name "Spark shell" --master spark://ip:7077
#如果自己的application则直接执行spark-submit 脚本传入自己的--class等参数信息就可以

###########################################################################

#还是判断了一下SPARK_HOME环境变量是否存在
if [ -z "${SPARK_HOME}" ]; then
  export SPARK_HOME="$(cd "`dirname "$0"`"/..; pwd)"
fi

#配置一些环境变量,它会将conf/spark-env.sh中的环境变量加载进来:
. "${SPARK_HOME}"/bin/load-spark-env.sh

# Find the java binary
#如果有java_home环境变量会将java_home/bin/java给RUNNER
#if [ -n str ] 表示当串的长度大于0时为真
if [ -n "${JAVA_HOME}" ]; then
  RUNNER="${JAVA_HOME}/bin/java"
else
  if [ `command -v java` ]; then
    RUNNER="java"
  else
    echo "JAVA_HOME is not set" >&
    exit
  fi
fi

# Find Spark jars.
#会先找spark_home/RELESE文本是否存在，如果存在将spark_home/lib目录给变量ASSEMBLY_DIR
#spark2目录是${SPARK_HOME}/jars，spark1.x目录是${SPARK_HOME}/lib
if [ -f "${SPARK_HOME}/RELEASE" ]; then
  SPARK_JARS_DIR="${SPARK_HOME}/jars"
else
  SPARK_JARS_DIR="${SPARK_HOME}/assembly/target/scala-$SPARK_SCALA_VERSION/jars"
fi

#---ls -1与ls -l的区别在于ls -1只会返回文件名，没有文件类型，大小，日期等信息。num_jars返回spark-assembly的jar有多少个
#GREP_OPTIONS= num_jars="$(ls-1 "$ASSEMBLY_DIR" | grep "^spark-assembly.*hadoop.*\.jar$"| wc -l)"
#---如果$num_jars为0，会报错并退出
# if ["$num_jars" -eq "0" -a -z "$SPARK_ASSEMBLY_JAR"-a "$SPARK_PREPEND_CLASSES" != "1" ]; then
#　　echo "Failed to find Spark assembly in$ASSEMBLY_DIR." 1>&2
#　　echo "You need to build Spark beforerunning this program." 1>&2
#　　exit 1
#fi

if [ ! -d "$SPARK_JARS_DIR" ] && [ -z "$SPARK_TESTING$SPARK_SQL_TESTING" ]; then
  echo "Failed to find Spark jars directory ($SPARK_JARS_DIR)." >&
  echo "You need to build Spark with the target \"package\" before running this program." >&
  exit
else
  LAUNCH_CLASSPATH="$SPARK_JARS_DIR/*"
fi

# Add the launcher build dir to the classpath if requested.
if [ -n "$SPARK_PREPEND_CLASSES" ]; then
  LAUNCH_CLASSPATH="${SPARK_HOME}/launcher/target/scala-$SPARK_SCALA_VERSION/classes:$LAUNCH_CLASSPATH"
fi

# For tests
if [[ -n "$SPARK_TESTING" ]]; then
  unset YARN_CONF_DIR
  unset HADOOP_CONF_DIR
fi

# The launcher library will print arguments separated by a NULL character, to allow arguments with
# characters that would be otherwise interpreted by the shell. Read that in a while loop, populating
# an array that will be used to exec the final command.
#
# The exit code of the launcher is appended to the output, so the parent shell removes it from the
# command array and checks the value to see if the launcher succeeded.
build_command() {
  "$RUNNER" -Xmx128m -cp "$LAUNCH_CLASSPATH" org.apache.spark.launcher.Main "$@"
  printf "%d\0" $?
}

CMD=()
while IFS= read -d '' -r ARG; do
  CMD+=("$ARG")
done < <(build_command "$@") ##调用org.apache.spark.launcher.Main拼接提交命令

COUNT=${#CMD[@]}
LAST=$((COUNT - ))
LAUNCHER_EXIT_CODE=${CMD[$LAST]}  

# Certain JVM failures result in errors being printed to stdout (instead of stderr), which causes
# the code that parses the output of the launcher to get confused. In those cases, check if the
# exit code is an integer, and if it's not, handle it as a special error case.
if ! [[ $LAUNCHER_EXIT_CODE =~ ^[-]+$ ]]; then
  echo "${CMD[@]}" | head -n- >&
  exit
fi

if [ $LAUNCHER_EXIT_CODE !=  ]; then
  exit $LAUNCHER_EXIT_CODE
fi

CMD=("${CMD[@]:0:$LAST}")
exec "${CMD[@]}"   ##shell拉起命令

##CMD形如：
#/usr/java/jdk1.7.0_79/bin/java -cp /opt/cloudera/parcels/SPARK2-2.0.0.cloudera.beta1-1.cdh5.7.0.p0.108015/lib/spark2/conf/:/opt/cloudera/parcels/SPARK2-2.0.0.cloudera.beta1-1.cdh5.7.0.p0.108015/lib/spark2/jars/*:/etc/hadoop/:/etc/hadoop/conf.cloudera.yarn/ -XX:MaxPermSize=256m org.apache.spark.deploy.SparkSubmit --master yarn --deploy-mode cluster --conf spark.driver.extraClassPath=/opt/cloudera/parcels/CDH/lib/hbase/lib/* --conf spark.scheduler.mode=FAIR --conf spark.executorEnv.JAVA_HOME=/usr/java/jdk1.8 --conf spark.yarn.appMasterEnv.JAVA_HOME=/usr/java/jdk1.8 --conf spark.yarn.maxAppAttempts=1 --class opHbase.opHbase.TopHbase --name Hbase --verbose --files /etc/hadoop/conf/log4j.properties,/etc/hive/conf/hive-site.xml --jars hdfs://10.8.18.74:8020/ada/spark/share/tech_component/tc.plat.spark.jar,hdfs://10.8.18.74:8020/ada/spark/share/tech_component/bigdata4i-1.0.jar,hdfs://10.8.18.74:8020/ada/spark/share/tech_component/bigdata-sparklog-1.0.jar,hdfs://108474.server.bigdata.com.cn:8020/user/lyy/App/tc.app.test.opHbase-1.0.jar,hdfs://10.8.18.74:8020/ada/spark/share/tech_component/mysql-connector-java-5.1.24-bin.jar hdfs://108474.server.bigdata.com.cn:8020/user/lyy/App/opHbase.opHbase.jar loglevel=ALL path=hdfs://108474.server.bigdata.com.cn:8020/user/lyy/data/hfile hbtab=hbase_test
#假如是spark-shell提交的，形如：
#env LD_LIBRARY_PATH=:/opt/cloudera/parcels/CDH-5.8.2-1.cdh5.8.2.p0.3/lib/hadoop/lib/native:/opt/cloudera/parcels/CDH-5.8.2-1.cdh5.8.2.p0.3/lib/hadoop/lib/native /usr/java/jdk1.7.0_79/bin/java -cp /opt/cloudera/parcels/SPARK2-2.0.0.cloudera.beta1-1.cdh5.7.0.p0.108015/lib/spark2/conf/:/opt/cloudera/parcels/SPARK2-2.0.0.cloudera.beta1-1.cdh5.7.0.p0.108015/lib/spark2/jars/*:/opt/cloudera/parcels/SPARK2-2.0.0.cloudera.beta1-1.cdh5.7.0.p0.108015/lib/spark2/conf/yarn-conf/ -Dscala.usejavacp=true -Xmx1g -XX:MaxPermSize=256m org.apache.spark.deploy.SparkSubmit --class org.apache.spark.repl.Main --name Spark shell spark-shell

spark-config.sh	初始化环境变量 SPARK_CONF_DIR, PYTHONPATH
bin/load-spark-env.sh	初始化环境变量SPARK_SCALA_VERSION， 调用%SPARK_HOME%/conf/spark-env.sh加载用户自定义环境变量
conf/spark-env.sh	用户自定义配置
start-all.sh	同时启动master和slave

#start-daemon.sh：
#主要完成进程相关基本信息初始化，然后调用bin/spark-class进行守护进程启动，该脚本是创建端点的通用脚本，
#三端各自脚本都会调用spark-daemon.sh脚本启动各自进程

#!/usr/bin/env bash

.....................
##调用spark-config.sh
. "${SPARK_HOME}/sbin/spark-config.sh"

.....................
##调用load-spark-env.sh加载spark环境变量
. "${SPARK_HOME}/bin/load-spark-env.sh"

.....................

# some variables
log="$SPARK_LOG_DIR/spark-$SPARK_IDENT_STRING-$command-$instance-$HOSTNAME.out"  ##日志目录
pid="$SPARK_PID_DIR/spark-$SPARK_IDENT_STRING-$command-$instance.pid"  ##pid目录

.....................

run_command() {
  mode="$1"
  shift

 .............

  case "$mode" in
    (class)
        ##直接调用spark-class,该命令用于启动master或者slave
      execute_command nice -n "$SPARK_NICENESS" "${SPARK_HOME}"/bin/spark-class "$command" "$@"
      ;;

    (submit)
      execute_command nice -n "$SPARK_NICENESS" bash "${SPARK_HOME}"/bin/spark-submit --class "$command" "$@" 调用spark-submit
      ;;

    (*)
      echo "unknown mode: $mode"
      exit
      ;;
  esac

}

case $option in

  (submit)## 用于提交任务
    run_command submit "$@"
    ;;

  (start) ##用于启动
    run_command class "$@"
    ;;
.....................

esac

##start-master.sh：

#!/usr/bin/env bash

.............................

CLASS="org.apache.spark.deploy.master.Master"  #设置主类名称Master

###加载相应脚本，获取spark环境变量及配置
. "${SPARK_HOME}/sbin/spark-config.sh"
. "${SPARK_HOME}/bin/load-spark-env.sh"

if [ "$SPARK_MASTER_PORT" = "" ]; then
  SPARK_MASTER_PORT=  ##设置进程端口
fi

if [ "$SPARK_MASTER_HOST" = "" ]; then
  case `uname` in
      (SunOS)
      SPARK_MASTER_HOST="`/usr/sbin/check-hostname | awk '{print $NF}'`"
      ;;
      (*)
      SPARK_MASTER_HOST="`hostname -f`"  ##获取master启动所在的主机名称
      ;;
  esac
fi

if [ "$SPARK_MASTER_WEBUI_PORT" = "" ]; then
  SPARK_MASTER_WEBUI_PORT=  ##webui端口
fi
##调用spark-daemon.sh启动
##"${SPARK_HOME}/sbin"/spark-daemon.sh start org.apache.spark.deploy.master.Master 1 --host $SPARK_MASTER_HOST --port  \
# $SPARK_MASTER_PORT --webui-port $SPARK_MASTER_WEBUI_PORT  $ORIGINAL_ARGS
##最后转换成：
##bin/spark-class --class org.apache.spark.deploy.master.Master --host $SPARK_MASTER_HOST --port $SPARK_MASTER_PORT \
#--webui-port $SPARK_MASTER_WEBUI_PORT $ORIGINAL_ARGS
"${SPARK_HOME}/sbin"/spark-daemon.sh start $CLASS  \
  --host $SPARK_MASTER_HOST --port $SPARK_MASTER_PORT --webui-port $SPARK_MASTER_WEBUI_PORT \
  $ORIGINAL_ARGS

##stat-slaves.sh:

#!/usr/bin/env bash

.......................

##调用脚本初始化环境

. "${SPARK_HOME}/sbin/spark-config.sh"
. "${SPARK_HOME}/bin/load-spark-env.sh"

# Find the port number for the master
if [ "$SPARK_MASTER_PORT" = "" ]; then
  SPARK_MASTER_PORT=  ##master的端口
fi

if [ "$SPARK_MASTER_HOST" = "" ]; then
  case `uname` in
      (SunOS)
      SPARK_MASTER_HOST="`/usr/sbin/check-hostname | awk '{print $NF}'`"
      ;;
      (*)
      SPARK_MASTER_HOST="`hostname -f`" ##master的主机名
      ;;
  esac
fi

# Launch the slaves
"${SPARK_HOME}/sbin/slaves.sh" cd "${SPARK_HOME}" \; "${SPARK_HOME}/sbin/start-slave.sh" "spark://$SPARK_MASTER_HOST:$SPARK_MASTER_PORT"

##${SPARK_HOME}/sbin/slaves.sh:

#!/usr/bin/env bash

........................
. "${SPARK_HOME}/sbin/spark-config.sh"

. "${SPARK_HOME}/bin/load-spark-env.sh"

###获取slaves列表
if [ "$HOSTLIST" = "" ]; then
  if [ "$SPARK_SLAVES" = "" ]; then
    if [ -f "${SPARK_CONF_DIR}/slaves" ]; then
      HOSTLIST=`cat "${SPARK_CONF_DIR}/slaves"`
    else
      HOSTLIST=localhost
    fi
  else
    HOSTLIST=`cat "${SPARK_SLAVES}"`
  fi
fi
........................

if [ "$SPARK_SSH_OPTS" = "" ]; then
  SPARK_SSH_OPTS="-o StrictHostKeyChecking=no"
fi

##读取conf/slaves文件并遍历，通过ssh连接到对应slave节点，启动 ${SPARK_HOME}/sbin/start-slave.sh spark://$SPARK_MASTER_HOST:$SPARK_MASTER_PORT
for slave in `echo "$HOSTLIST"|sed  "s/#.*$//;/^$/d"`; do
  if [ -n "${SPARK_SSH_FOREGROUND}" ]; then
    ssh $SPARK_SSH_OPTS "$slave" $"${@// /\\ }" \
      >& | sed "s/^/$slave: /"
  else
    ssh $SPARK_SSH_OPTS "$slave" $"${@// /\\ }" \
      >& | sed "s/^/$slave: /" &
  fi
  if [ "$SPARK_SLAVE_SLEEP" != "" ]; then
    sleep $SPARK_SLAVE_SLEEP
  fi
done

wait

###"${SPARK_HOME}/sbin/start-slave.sh":

#!/usr/bin/env bash

# Starts a slave on the machine this script is executed on.
#
# Environment Variables
#
#   SPARK_WORKER_INSTANCES  The number of worker instances to run on this
#                           slave.  Default is 1.
#   SPARK_WORKER_PORT       The base port number for the first worker. If set,
#                           subsequent workers will increment this number.  If
#                           unset, Spark will find a valid port number, but
#                           with no guarantee of a predictable pattern.
#   SPARK_WORKER_WEBUI_PORT The base port for the web interface of the first
#                           worker.  Subsequent workers will increment this
#                           number.  Default is 8081.

# NOTE: This exact class name is matched downstream by SparkSubmit.
# Any changes need to be reflected there.
CLASS="org.apache.spark.deploy.worker.Worker"

. "${SPARK_HOME}/sbin/spark-config.sh"

. "${SPARK_HOME}/bin/load-spark-env.sh"

.......................
MASTER=$ #获取master参数
shift

# Determine desired worker port
if [ "$SPARK_WORKER_WEBUI_PORT" = "" ]; then
  SPARK_WORKER_WEBUI_PORT=  #work的webui端口
fi

# Start up the appropriate number of workers on this machine.
# quick local function to start a worker
function start_instance {
  WORKER_NUM=$ ##通过SPARK_WORKER_INSTANCES得到 WORKER_NUM
  shift

  if [ "$SPARK_WORKER_PORT" = "" ]; then
    PORT_FLAG=
    PORT_NUM=
  else
    PORT_FLAG="--port"
    PORT_NUM=$(( $SPARK_WORKER_PORT + $WORKER_NUM -  )) ##端口依次递增
  fi
  WEBUI_PORT=$(( $SPARK_WORKER_WEBUI_PORT + $WORKER_NUM -  ))
  ##${SPARK_HOME}/sbin /spark-daemon.sh start org.apache.spark.deploy.worker.Worker $WORKER_NUM  \
  ##--webui-port "$WEBUI_PORT" $PORT_FLAG $PORT_NUM $MASTER "$@"
  "${SPARK_HOME}/sbin"/spark-daemon.sh start $CLASS $WORKER_NUM \
     --webui-port "$WEBUI_PORT" $PORT_FLAG $PORT_NUM $MASTER "$@"
}

if [ "$SPARK_WORKER_INSTANCES" = "" ]; then
  start_instance  "$@"
else
  for ((i=; i<$SPARK_WORKER_INSTANCES; i++)); do
    start_instance $((  + $i )) "$@"
  done
fi