spark复习笔记(4):spark脚本分析

1.[start-all.sh]

#!/usr/bin/env bash

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

# Start all spark daemons.　　　　#启动所有守护进程
# Starts the master on this node.　　#在这个节点上启动master
# Starts a worker on each node specified in conf/slaves   #在conf/slaves文件下指定的节点上启动worker进程

if [ -z "${SPARK_HOME}" ]; then　　　　#判断spark环境变量在不在
  export SPARK_HOME="$(cd "`dirname "$0"`"/..; pwd)"　　#如果在的话，就把环境变量导入
fi

# Load the Spark configuration　　　　#加载配置文件
. "${SPARK_HOME}/sbin/spark-config.sh"　　#调用spark-config.sh脚本

# Start Master
"${SPARK_HOME}/sbin"/start-master.sh　　#启动master脚本进程

# Start Workers
"${SPARK_HOME}/sbin"/start-slaves.sh　　#启动slaves脚本进程

2.[start-master.sh]

#!/usr/bin/env bash

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

# Starts the master on the machine this script is executed on.　　#在这个机器上执行脚本，启动master进程

if [ -z "${SPARK_HOME}" ]; then　　　　#首先配置环境变量
  export SPARK_HOME="$(cd "`dirname "$0"`"/..; pwd)"
fi

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

if [[ "$@" = *--help ]] || [[ "$@" = *-h ]]; then
  echo "Usage: ./sbin/start-master.sh [options]"
  pattern="Usage:"
  pattern+="|Using Spark's default log4j profile:"
  pattern+="|Registered signal handlers for"

  "${SPARK_HOME}"/bin/spark-class $CLASS --help 2>&1 | grep -v "$pattern" 1>&2
  exit 1
fi

ORIGINAL_ARGS="$@"

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

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

if [ "$SPARK_MASTER_PORT" = "" ]; then
  SPARK_MASTER_PORT=7077
fi

if [ "$SPARK_MASTER_HOST" = "" ]; then
  SPARK_MASTER_HOST=`hostname -f`
fi

if [ "$SPARK_MASTER_WEBUI_PORT" = "" ]; then
  SPARK_MASTER_WEBUI_PORT=8080
fi

"${SPARK_HOME}/sbin"/spark-daemon.sh start $CLASS 1 
  --host $SPARK_MASTER_HOST --port $SPARK_MASTER_PORT --webui-port $SPARK_MASTER_WEBUI_PORT 
  $ORIGINAL_ARGS