Flink start-cluster.sh

1、start-cluster.sh

# 1、获取文件所在的路径
bin=`dirname "$0"`
bin=`cd "$bin"; pwd`

# 2、先加载配置文件，里面都是一些函数和变量，还有一些逻辑
. "$bin"/config.sh

# 3、启动JobManager
# Start the JobManager instance(s)
shopt -s nocasematch

# 4、判断JobManager的启动模式，是集群还是单机模式，读取的是flink-conf.yaml中的 high-availability.type
if [[ $HIGH_AVAILABILITY == "zookeeper" ]]; then
    # HA Mode
    # 5、如果是基于zookeeper集群模式，调用readMasters
    readMasters

    echo "Starting HA cluster with ${#MASTERS[@]} masters."

    for ((i=0;i<${#MASTERS[@]};++i)); do
        master=${MASTERS[i]}
        webuiport=${WEBUIPORTS[i]}

        # 6、如果是本地模式，本地启动
        if [ ${MASTERS_ALL_LOCALHOST} = true ] ; then
            "${FLINK_BIN_DIR}"/jobmanager.sh start "${master}" "${webuiport}"
        else
            # 7、远程通过SSH方式进行后台启动
            ssh -n $FLINK_SSH_OPTS $master -- "nohup /bin/bash -l \"${FLINK_BIN_DIR}/jobmanager.sh\" start ${master} ${webuiport} &"
        fi
    done

else
    echo "Starting cluster."

    # Start single JobManager on this machine
    # 8、当前节点启动JobManager
    "$FLINK_BIN_DIR"/jobmanager.sh start
fi
shopt -u nocasematch

# Start TaskManager instance(s)
# 9、启动TaskManager
TMWorkers start

2、加载config.sh

# 构建Flink ClassPath
constructFlinkClassPath() {
    local FLINK_DIST
    local FLINK_CLASSPATH

    while read -d '' -r jarfile ; do
        if [[ "$jarfile" =~ .*/flink-dist[^/]*.jar$ ]]; then
            FLINK_DIST="$FLINK_DIST":"$jarfile"
        elif [[ "$FLINK_CLASSPATH" == "" ]]; then
            FLINK_CLASSPATH="$jarfile";
        else
            FLINK_CLASSPATH="$FLINK_CLASSPATH":"$jarfile"
        fi
    done < <(find "$FLINK_LIB_DIR" ! -type d -name '*.jar' -print0 | sort -z)

    local FLINK_DIST_COUNT
    FLINK_DIST_COUNT="$(echo "$FLINK_DIST" | tr -s ':' '\n' | grep -v '^$' | wc -l)"

    # If flink-dist*.jar cannot be resolved write error messages to stderr since stdout is stored
    # as the classpath and exit function with empty classpath to force process failure
    if [[ "$FLINK_DIST" == "" ]]; then
        (>&2 echo "[ERROR] Flink distribution jar not found in $FLINK_LIB_DIR.")
        exit 1
    elif [[ "$FLINK_DIST_COUNT" -gt 1 ]]; then
        (>&2 echo "[ERROR] Multiple flink-dist*.jar found in $FLINK_LIB_DIR. Please resolve.")
        exit 1
    fi

    echo "$FLINK_CLASSPATH""$FLINK_DIST"
}

findFlinkDistJar() {
    local FLINK_DIST
    FLINK_DIST="$(find "$FLINK_LIB_DIR" -name 'flink-dist*.jar')"
    local FLINK_DIST_COUNT
    FLINK_DIST_COUNT="$(echo "$FLINK_DIST" | wc -l)"

    # If flink-dist*.jar cannot be resolved write error messages to stderr since stdout is stored
    # as the classpath and exit function with empty classpath to force process failure
    if [[ "$FLINK_DIST" == "" ]]; then
        (>&2 echo "[ERROR] Flink distribution jar not found in $FLINK_LIB_DIR.")
        exit 1
    elif [[ "$FLINK_DIST_COUNT" -gt 1 ]]; then
        (>&2 echo "[ERROR] Multiple flink-dist*.jar found in $FLINK_LIB_DIR. Please resolve.")
        exit 1
    fi

    echo "$FLINK_DIST"
}

findSqlGatewayJar() {
    local SQL_GATEWAY
    SQL_GATEWAY="$(find "$FLINK_OPT_DIR" -name 'flink-sql-gateway*.jar')"
    local SQL_GATEWAY_COUNT
    SQL_GATEWAY_COUNT="$(echo "$SQL_GATEWAY" | wc -l)"

    # If flink-sql-gateway*.jar cannot be resolved write error messages to stderr since stdout is stored
    # as the classpath and exit function with empty classpath to force process failure
    if [[ "$SQL_GATEWAY" == "" ]]; then
        (>&2 echo "[ERROR] Flink sql gateway jar not found in $FLINK_OPT_DIR.")
        exit 1
    elif [[ "$SQL_GATEWAY_COUNT" -gt 1 ]]; then
        (>&2 echo "[ERROR] Multiple flink-sql-gateway*.jar found in $FLINK_OPT_DIR. Please resolve.")
        exit 1
    fi

    echo "$SQL_GATEWAY"
}

findFlinkPythonJar() {
    local FLINK_PYTHON
    FLINK_PYTHON="$(find "$FLINK_OPT_DIR" -name 'flink-python*.jar')"
    local FLINK_PYTHON_COUNT
    FLINK_PYTHON_COUNT="$(echo "FLINK_PYTHON" | wc -l)"

    # If flink-python*.jar cannot be resolved write error messages to stderr since stdout is stored
    # as the classpath and exit function with empty classpath to force process failure
    if [[ "$FLINK_PYTHON" == "" ]]; then
        echo "[WARN] Flink python jar not found in $FLINK_OPT_DIR."
    elif [[ "$FLINK_PYTHON_COUNT" -gt 1 ]]; then
        (>&2 echo "[ERROR] Multiple flink-python*.jar found in $FLINK_OPT_DIR. Please resolve.")
        exit 1
    fi

    echo "$FLINK_PYTHON"

}
# These are used to mangle paths that are passed to java when using
# cygwin. Cygwin paths are like linux paths, i.e. /path/to/somewhere
# but the windows java version expects them in Windows Format, i.e. C:\bla\blub.
# "cygpath" can do the conversion.
manglePath() {
    UNAME=$(uname -s)
    if [ "${UNAME:0:6}" == "CYGWIN" ]; then
        echo `cygpath -w "$1"`
    else
        echo $1
    fi
}

manglePathList() {
    UNAME=$(uname -s)
    # a path list, for example a java classpath
    if [ "${UNAME:0:6}" == "CYGWIN" ]; then
        echo `cygpath -wp "$1"`
    else
        echo $1
    fi
}

# Looks up a config value by key from a simple YAML-style key-value map.
# $1: key to look up
# $2: default value to return if key does not exist
# $3: config file to read from
readFromConfig() {
    local key=$1
    local defaultValue=$2
    local configFile=$3

    # first extract the value with the given key (1st sed), then trim the result (2nd sed)
    # if a key exists multiple times, take the "last" one (tail)
    local value=`sed -n "s/^[ ]*${key}[ ]*: \([^#]*\).*$/\1/p" "${configFile}" | sed "s/^ *//;s/ *$//" | tail -n 1`

    [ -z "$value" ] && echo "$defaultValue" || echo "$value"
}

########################################################################################################################
# DEFAULT CONFIG VALUES: These values will be used when nothing has been specified in conf/flink-conf.yaml
# -or- the respective environment variables are not set.
########################################################################################################################


# WARNING !!! , these values are only used if there is nothing else is specified in
# conf/flink-conf.yaml

DEFAULT_ENV_PID_DIR="/tmp"                          # Directory to store *.pid files to
DEFAULT_ENV_LOG_MAX=10                              # Maximum number of old log files to keep
DEFAULT_ENV_JAVA_OPTS=""                            # Optional JVM args
DEFAULT_ENV_JAVA_OPTS_JM=""                         # Optional JVM args (JobManager)
DEFAULT_ENV_JAVA_OPTS_TM=""                         # Optional JVM args (TaskManager)
DEFAULT_ENV_JAVA_OPTS_HS=""                         # Optional JVM args (HistoryServer)
DEFAULT_ENV_JAVA_OPTS_CLI=""                        # Optional JVM args (Client)
DEFAULT_ENV_SSH_OPTS=""                             # Optional SSH parameters running in cluster mode
DEFAULT_YARN_CONF_DIR=""                            # YARN Configuration Directory, if necessary
DEFAULT_HADOOP_CONF_DIR=""                          # Hadoop Configuration Directory, if necessary
DEFAULT_HBASE_CONF_DIR=""                           # HBase Configuration Directory, if necessary

########################################################################################################################
# CONFIG KEYS: The default values can be overwritten by the following keys in conf/flink-conf.yaml
########################################################################################################################

KEY_TASKM_COMPUTE_NUMA="taskmanager.compute.numa"

KEY_ENV_PID_DIR="env.pid.dir"
KEY_ENV_LOG_DIR="env.log.dir"
KEY_ENV_LOG_MAX="env.log.max"
KEY_ENV_YARN_CONF_DIR="env.yarn.conf.dir"
KEY_ENV_HADOOP_CONF_DIR="env.hadoop.conf.dir"
KEY_ENV_HBASE_CONF_DIR="env.hbase.conf.dir"
KEY_ENV_JAVA_HOME="env.java.home"
KEY_ENV_JAVA_OPTS="env.java.opts.all"
KEY_ENV_JAVA_OPTS_JM="env.java.opts.jobmanager"
KEY_ENV_JAVA_OPTS_TM="env.java.opts.taskmanager"
KEY_ENV_JAVA_OPTS_HS="env.java.opts.historyserver"
KEY_ENV_JAVA_OPTS_CLI="env.java.opts.client"
KEY_ENV_SSH_OPTS="env.ssh.opts"
KEY_HIGH_AVAILABILITY="high-availability.type"
KEY_ZK_HEAP_MB="zookeeper.heap.mb"

########################################################################################################################
# PATHS AND CONFIG
########################################################################################################################

target="$0"
# For the case, the executable has been directly symlinked, figure out
# the correct bin path by following its symlink up to an upper bound.
# Note: we can't use the readlink utility here if we want to be POSIX
# compatible.
iteration=0
while [ -L "$target" ]; do
    if [ "$iteration" -gt 100 ]; then
        echo "Cannot resolve path: You have a cyclic symlink in $target."
        break
    fi
    ls=`ls -ld -- "$target"`
    target=`expr "$ls" : '.* -> \(.*\)$'`
    iteration=$((iteration + 1))
done

# Convert relative path to absolute path and resolve directory symlinks
bin=`dirname "$target"`
SYMLINK_RESOLVED_BIN=`cd "$bin"; pwd -P`

# Define the main directory of the flink installation
# If config.sh is called by pyflink-shell.sh in python bin directory(pip installed), then do not need to set the FLINK_HOME here.
if [ -z "$_FLINK_HOME_DETERMINED" ]; then
    FLINK_HOME=`dirname "$SYMLINK_RESOLVED_BIN"`
fi
if [ -z "$FLINK_LIB_DIR" ]; then FLINK_LIB_DIR=$FLINK_HOME/lib; fi
if [ -z "$FLINK_PLUGINS_DIR" ]; then FLINK_PLUGINS_DIR=$FLINK_HOME/plugins; fi
if [ -z "$FLINK_OPT_DIR" ]; then FLINK_OPT_DIR=$FLINK_HOME/opt; fi


# These need to be mangled because they are directly passed to java.
# The above lib path is used by the shell script to retrieve jars in a
# directory, so it needs to be unmangled.
FLINK_HOME_DIR_MANGLED=`manglePath "$FLINK_HOME"`
if [ -z "$FLINK_CONF_DIR" ]; then FLINK_CONF_DIR=$FLINK_HOME_DIR_MANGLED/conf; fi
FLINK_BIN_DIR=$FLINK_HOME_DIR_MANGLED/bin
DEFAULT_FLINK_LOG_DIR=$FLINK_HOME_DIR_MANGLED/log
FLINK_CONF_FILE="flink-conf.yaml"
YAML_CONF=${FLINK_CONF_DIR}/${FLINK_CONF_FILE}

### Exported environment variables ###
# 定义一些环境变量
export FLINK_CONF_DIR
export FLINK_BIN_DIR
export FLINK_PLUGINS_DIR
# export /lib dir to access it during deployment of the Yarn staging files
export FLINK_LIB_DIR
# export /opt dir to access it for the SQL client
export FLINK_OPT_DIR

########################################################################################################################
# ENVIRONMENT VARIABLES
########################################################################################################################

# read JAVA_HOME from config with no default value
MY_JAVA_HOME=$(readFromConfig ${KEY_ENV_JAVA_HOME} "" "${YAML_CONF}")
# check if config specified JAVA_HOME
if [ -z "${MY_JAVA_HOME}" ]; then
    # config did not specify JAVA_HOME. Use system JAVA_HOME
    MY_JAVA_HOME="${JAVA_HOME}"
fi
# check if we have a valid JAVA_HOME and if java is not available
if [ -z "${MY_JAVA_HOME}" ] && ! type java > /dev/null 2> /dev/null; then
    echo "Please specify JAVA_HOME. Either in Flink config ./conf/flink-conf.yaml or as system-wide JAVA_HOME."
    exit 1
else
    JAVA_HOME="${MY_JAVA_HOME}"
fi

UNAME=$(uname -s)
if [ "${UNAME:0:6}" == "CYGWIN" ]; then
    JAVA_RUN=java
else
    if [[ -d "$JAVA_HOME" ]]; then
        JAVA_RUN="$JAVA_HOME"/bin/java
    else
        JAVA_RUN=java
    fi
fi

# Define HOSTNAME if it is not already set
if [ -z "${HOSTNAME}" ]; then
    HOSTNAME=`hostname`
fi

IS_NUMBER="^[0-9]+$"

# Verify that NUMA tooling is available
command -v numactl >/dev/null 2>&1
if [[ $? -ne 0 ]]; then
    FLINK_TM_COMPUTE_NUMA="false"
else
    # Define FLINK_TM_COMPUTE_NUMA if it is not already set
    if [ -z "${FLINK_TM_COMPUTE_NUMA}" ]; then
        FLINK_TM_COMPUTE_NUMA=$(readFromConfig ${KEY_TASKM_COMPUTE_NUMA} "false" "${YAML_CONF}")
    fi
fi

if [ -z "${MAX_LOG_FILE_NUMBER}" ]; then
    MAX_LOG_FILE_NUMBER=$(readFromConfig ${KEY_ENV_LOG_MAX} ${DEFAULT_ENV_LOG_MAX} "${YAML_CONF}")
    export MAX_LOG_FILE_NUMBER
fi

if [ -z "${FLINK_LOG_DIR}" ]; then
    FLINK_LOG_DIR=$(readFromConfig ${KEY_ENV_LOG_DIR} "${DEFAULT_FLINK_LOG_DIR}" "${YAML_CONF}")
fi

if [ -z "${YARN_CONF_DIR}" ]; then
    YARN_CONF_DIR=$(readFromConfig ${KEY_ENV_YARN_CONF_DIR} "${DEFAULT_YARN_CONF_DIR}" "${YAML_CONF}")
fi

if [ -z "${HADOOP_CONF_DIR}" ]; then
    HADOOP_CONF_DIR=$(readFromConfig ${KEY_ENV_HADOOP_CONF_DIR} "${DEFAULT_HADOOP_CONF_DIR}" "${YAML_CONF}")
fi

if [ -z "${HBASE_CONF_DIR}" ]; then
    HBASE_CONF_DIR=$(readFromConfig ${KEY_ENV_HBASE_CONF_DIR} "${DEFAULT_HBASE_CONF_DIR}" "${YAML_CONF}")
fi

if [ -z "${FLINK_PID_DIR}" ]; then
    FLINK_PID_DIR=$(readFromConfig ${KEY_ENV_PID_DIR} "${DEFAULT_ENV_PID_DIR}" "${YAML_CONF}")
fi

if [ -z "${FLINK_ENV_JAVA_OPTS}" ]; then
    FLINK_ENV_JAVA_OPTS=$(readFromConfig ${KEY_ENV_JAVA_OPTS} "" "${YAML_CONF}")
    if [ -z "${FLINK_ENV_JAVA_OPTS}" ]; then
      # try deprecated key
      FLINK_ENV_JAVA_OPTS=$(readFromConfig "env.java.opts" "${DEFAULT_ENV_JAVA_OPTS}" "${YAML_CONF}")
    fi

    # Remove leading and ending double quotes (if present) of value
    FLINK_ENV_JAVA_OPTS="$( echo "${FLINK_ENV_JAVA_OPTS}" | sed -e 's/^"//'  -e 's/"$//' )"
fi

if [ -z "${FLINK_ENV_JAVA_OPTS_JM}" ]; then
    FLINK_ENV_JAVA_OPTS_JM=$(readFromConfig ${KEY_ENV_JAVA_OPTS_JM} "${DEFAULT_ENV_JAVA_OPTS_JM}" "${YAML_CONF}")
    # Remove leading and ending double quotes (if present) of value
    FLINK_ENV_JAVA_OPTS_JM="$( echo "${FLINK_ENV_JAVA_OPTS_JM}" | sed -e 's/^"//'  -e 's/"$//' )"
fi

if [ -z "${FLINK_ENV_JAVA_OPTS_TM}" ]; then
    FLINK_ENV_JAVA_OPTS_TM=$(readFromConfig ${KEY_ENV_JAVA_OPTS_TM} "${DEFAULT_ENV_JAVA_OPTS_TM}" "${YAML_CONF}")
    # Remove leading and ending double quotes (if present) of value
    FLINK_ENV_JAVA_OPTS_TM="$( echo "${FLINK_ENV_JAVA_OPTS_TM}" | sed -e 's/^"//'  -e 's/"$//' )"
fi

if [ -z "${FLINK_ENV_JAVA_OPTS_HS}" ]; then
    FLINK_ENV_JAVA_OPTS_HS=$(readFromConfig ${KEY_ENV_JAVA_OPTS_HS} "${DEFAULT_ENV_JAVA_OPTS_HS}" "${YAML_CONF}")
    # Remove leading and ending double quotes (if present) of value
    FLINK_ENV_JAVA_OPTS_HS="$( echo "${FLINK_ENV_JAVA_OPTS_HS}" | sed -e 's/^"//'  -e 's/"$//' )"
fi

if [ -z "${FLINK_ENV_JAVA_OPTS_CLI}" ]; then
    FLINK_ENV_JAVA_OPTS_CLI=$(readFromConfig ${KEY_ENV_JAVA_OPTS_CLI} "${DEFAULT_ENV_JAVA_OPTS_CLI}" "${YAML_CONF}")
    # Remove leading and ending double quotes (if present) of value
    FLINK_ENV_JAVA_OPTS_CLI="$( echo "${FLINK_ENV_JAVA_OPTS_CLI}" | sed -e 's/^"//'  -e 's/"$//' )"
fi
# -z是如果FLINK_SSH_OPTS的length为0的时候为true，-n是不为0的时候字符串为true
if [ -z "${FLINK_SSH_OPTS}" ]; then
    FLINK_SSH_OPTS=$(readFromConfig ${KEY_ENV_SSH_OPTS} "${DEFAULT_ENV_SSH_OPTS}" "${YAML_CONF}")
fi

# Define ZK_HEAP if it is not already set
if [ -z "${ZK_HEAP}" ]; then
    ZK_HEAP=$(readFromConfig ${KEY_ZK_HEAP_MB} 0 "${YAML_CONF}")
fi

# High availability
if [ -z "${HIGH_AVAILABILITY}" ]; then
     HIGH_AVAILABILITY=$(readFromConfig ${KEY_HIGH_AVAILABILITY} "" "${YAML_CONF}")
     if [ -z "${HIGH_AVAILABILITY}" ]; then
        # Try deprecated value
        DEPRECATED_HA=$(readFromConfig "high-availability" "$(readFromConfig "recovery.mode" "" "${YAML_CONF}")" "${YAML_CONF}")
        if [ -z "${DEPRECATED_HA}" ]; then
            HIGH_AVAILABILITY="none"
        elif [ ${DEPRECATED_HA} == "standalone" ]; then
            # Standalone is now 'none'
            HIGH_AVAILABILITY="none"
        else
            HIGH_AVAILABILITY=${DEPRECATED_HA}
        fi
     fi
fi

# Arguments for the JVM. Used for job and task manager JVMs.
# DO NOT USE FOR MEMORY SETTINGS! Use conf/flink-conf.yaml with keys
# JobManagerOptions#TOTAL_PROCESS_MEMORY and TaskManagerOptions#TOTAL_PROCESS_MEMORY for that!
if [ -z "${JVM_ARGS}" ]; then
    JVM_ARGS=""
fi

# Check if deprecated HADOOP_HOME is set, and specify config path to HADOOP_CONF_DIR if it's empty.
if [ -z "$HADOOP_CONF_DIR" ]; then
    if [ -n "$HADOOP_HOME" ]; then
        # HADOOP_HOME is set. Check if its a Hadoop 1.x or 2.x HADOOP_HOME path
        if [ -d "$HADOOP_HOME/conf" ]; then
            # It's Hadoop 1.x
            HADOOP_CONF_DIR="$HADOOP_HOME/conf"
        fi
        if [ -d "$HADOOP_HOME/etc/hadoop" ]; then
            # It's Hadoop 2.2+
            HADOOP_CONF_DIR="$HADOOP_HOME/etc/hadoop"
        fi
    fi
fi

# if neither HADOOP_CONF_DIR nor HADOOP_CLASSPATH are set, use some common default (if available)
if [ -z "$HADOOP_CONF_DIR" ] && [ -z "$HADOOP_CLASSPATH" ]; then
    if [ -d "/etc/hadoop/conf" ]; then
        echo "Setting HADOOP_CONF_DIR=/etc/hadoop/conf because no HADOOP_CONF_DIR or HADOOP_CLASSPATH was set."
        HADOOP_CONF_DIR="/etc/hadoop/conf"
    fi
fi

# Check if deprecated HBASE_HOME is set, and specify config path to HBASE_CONF_DIR if it's empty.
if [ -z "$HBASE_CONF_DIR" ]; then
    if [ -n "$HBASE_HOME" ]; then
        # HBASE_HOME is set.
        if [ -d "$HBASE_HOME/conf" ]; then
            HBASE_CONF_DIR="$HBASE_HOME/conf"
        fi
    fi
fi

# try and set HBASE_CONF_DIR to some common default if it's not set
if [ -z "$HBASE_CONF_DIR" ]; then
    if [ -d "/etc/hbase/conf" ]; then
        echo "Setting HBASE_CONF_DIR=/etc/hbase/conf because no HBASE_CONF_DIR was set."
        HBASE_CONF_DIR="/etc/hbase/conf"
    fi
fi

INTERNAL_HADOOP_CLASSPATHS="${HADOOP_CLASSPATH}:${HADOOP_CONF_DIR}:${YARN_CONF_DIR}"

if [ -n "${HBASE_CONF_DIR}" ]; then
    INTERNAL_HADOOP_CLASSPATHS="${INTERNAL_HADOOP_CLASSPATHS}:${HBASE_CONF_DIR}"
fi

# Auxiliary function which extracts the name of host from a line which
# also potentially includes topology information and the taskManager type
extractHostName() {
    # handle comments: extract first part of string (before first # character)
    WORKER=`echo $1 | cut -d'#' -f 1`

    # Extract the hostname from the network hierarchy
    if [[ "$WORKER" =~ ^.*/([0-9a-zA-Z.-]+)$ ]]; then
            WORKER=${BASH_REMATCH[1]}
    fi

    echo $WORKER
}

readMasters() {
    MASTERS_FILE="${FLINK_CONF_DIR}/masters"

    if [[ ! -f "${MASTERS_FILE}" ]]; then
        echo "No masters file. Please specify masters in 'conf/masters'."
        exit 1
    fi

    MASTERS=()
    WEBUIPORTS=()

    MASTERS_ALL_LOCALHOST=true
    GOON=true
    while $GOON; do
        read line || GOON=false
        HOSTWEBUIPORT=$( extractHostName $line)

        if [ -n "$HOSTWEBUIPORT" ]; then
            HOST=$(echo $HOSTWEBUIPORT | cut -f1 -d:)
            WEBUIPORT=$(echo $HOSTWEBUIPORT | cut -s -f2 -d:)
            MASTERS+=(${HOST})

            if [ -z "$WEBUIPORT" ]; then
                WEBUIPORTS+=(0)
            else
                WEBUIPORTS+=(${WEBUIPORT})
            fi

            if [ "${HOST}" != "localhost" ] && [ "${HOST}" != "127.0.0.1" ] ; then
                MASTERS_ALL_LOCALHOST=false
            fi
        fi
    done < "$MASTERS_FILE"
}

# 12、循环遍历slaves文件里面的节点
readWorkers() {
    WORKERS_FILE="${FLINK_CONF_DIR}/workers"

    if [[ ! -f "$WORKERS_FILE" ]]; then
        echo "No workers file. Please specify workers in 'conf/workers'."
        exit 1
    fi

    WORKERS=()

    WORKERS_ALL_LOCALHOST=true
    GOON=true
    while $GOON; do
        read line || GOON=false
        HOST=$( extractHostName $line)
        if [ -n "$HOST" ] ; then
            WORKERS+=(${HOST})
            if [ "${HOST}" != "localhost" ] && [ "${HOST}" != "127.0.0.1" ] ; then
                WORKERS_ALL_LOCALHOST=false
            fi
        fi
    done < "$WORKERS_FILE"
}

# starts or stops TMs on all workers
# TMWorkers start|stop
# 10、启动所有的TaskManager
TMWorkers() {
    CMD=$1

    # 11、读取slaves配置文件内容
    readWorkers

    # 13、本机启动
    if [ ${WORKERS_ALL_LOCALHOST} = true ] ; then
        # all-local setup
        for worker in ${WORKERS[@]}; do
            "${FLINK_BIN_DIR}"/taskmanager.sh "${CMD}"
        done
    else
        # 14、远程启动
        # non-local setup
        # start/stop TaskManager instance(s) using pdsh (Parallel Distributed Shell) when available
        command -v pdsh >/dev/null 2>&1
        if [[ $? -ne 0 ]]; then
            for worker in ${WORKERS[@]}; do
                ssh -n $FLINK_SSH_OPTS $worker -- "nohup /bin/bash -l \"${FLINK_BIN_DIR}/taskmanager.sh\" \"${CMD}\" &"
            done
        else
            PDSH_SSH_ARGS="" PDSH_SSH_ARGS_APPEND=$FLINK_SSH_OPTS pdsh -w $(IFS=, ; echo "${WORKERS[*]}") \
                "nohup /bin/bash -l \"${FLINK_BIN_DIR}/taskmanager.sh\" \"${CMD}\""
        fi
    fi
}

runBashJavaUtilsCmd() {
    local cmd=$1
    local conf_dir=$2
    local class_path=$3
    local dynamic_args=${@:4}
    class_path=`manglePathList "${class_path}"`

    local output=`"${JAVA_RUN}" -classpath "${class_path}" org.apache.flink.runtime.util.bash.BashJavaUtils ${cmd} --configDir "${conf_dir}" $dynamic_args 2>&1 | tail -n 1000`
    if [[ $? -ne 0 ]]; then
        echo "[ERROR] Cannot run BashJavaUtils to execute command ${cmd}." 1>&2
        # Print the output in case the user redirect the log to console.
        echo "$output" 1>&2
        exit 1
    fi

    echo "$output"
}

extractExecutionResults() {
    local output="$1"
    local expected_lines="$2"
    local EXECUTION_PREFIX="BASH_JAVA_UTILS_EXEC_RESULT:"
    local execution_results
    local num_lines

    execution_results=$(echo "${output}" | grep ${EXECUTION_PREFIX})
    num_lines=$(echo "${execution_results}" | wc -l)
    # explicit check for empty result, because if execution_results is empty, then wc returns 1
    if [[ -z ${execution_results} ]]; then
        echo "[ERROR] The execution result is empty." 1>&2
        exit 1
    fi
    if [[ ${num_lines} -ne ${expected_lines} ]]; then
        echo "[ERROR] The execution results has unexpected number of lines, expected: ${expected_lines}, actual: ${num_lines}." 1>&2
        echo "[ERROR] An execution result line is expected following the prefix '${EXECUTION_PREFIX}'" 1>&2
        echo "$output" 1>&2
        exit 1
    fi

    echo "${execution_results//${EXECUTION_PREFIX}/}"
}

extractLoggingOutputs() {
    local output="$1"
    local EXECUTION_PREFIX="BASH_JAVA_UTILS_EXEC_RESULT:"

    echo "${output}" | grep -v ${EXECUTION_PREFIX}
}

parseResourceParamsAndExportLogs() {
  local cmd=$1
  java_utils_output=$(runBashJavaUtilsCmd ${cmd} "${FLINK_CONF_DIR}" "${FLINK_BIN_DIR}/bash-java-utils.jar:$(findFlinkDistJar)" "${@:2}")
  logging_output=$(extractLoggingOutputs "${java_utils_output}")
  params_output=$(extractExecutionResults "${java_utils_output}" 2)

  if [[ $? -ne 0 ]]; then
    echo "[ERROR] Could not get JVM parameters and dynamic configurations properly."
    echo "[ERROR] Raw output from BashJavaUtils:"
    echo "$java_utils_output"
    exit 1
  fi

  jvm_params=$(echo "${params_output}" | head -n1)
  export JVM_ARGS="${JVM_ARGS} ${jvm_params}"
  export DYNAMIC_PARAMETERS=$(IFS=" " echo "${params_output}" | tail -n1)

  export FLINK_INHERITED_LOGS="
$FLINK_INHERITED_LOGS

RESOURCE_PARAMS extraction logs:
jvm_params: $jvm_params
dynamic_configs: $DYNAMIC_PARAMETERS
logs: $logging_output
"
}

parseJmArgsAndExportLogs() {
  parseResourceParamsAndExportLogs GET_JM_RESOURCE_PARAMS "$@"
}

parseTmArgsAndExportLogs() {
  parseResourceParamsAndExportLogs GET_TM_RESOURCE_PARAMS "$@"
}

关键的函数 TMWorkers(启动TaskManager)、readMasters(读取masters信息)、readWorkers(读取worker信息)，定义了一些环境变量

3、jobmanager.sh

# Start/stop a Flink JobManager.
USAGE="Usage: jobmanager.sh ((start|start-foreground) [args])|stop|stop-all"

STARTSTOP=$1

if [ -z $2 ] || [[ $2 == "-D" ]]; then
    # start [-D ...]
    args=("${@:2}")
elif [ -z $3 ] || [[ $3 == "-D" ]]; then
    # legacy path: start  [-D ...]
    HOST=$2
    args=("${@:3}")
else
    # legacy path: start   [-D ...]
    HOST=$2
    WEBUIPORT=$3
    args=("${@:4}")
fi

# 16、校验参数
if [[ $STARTSTOP != "start" ]] && [[ $STARTSTOP != "start-foreground" ]] && [[ $STARTSTOP != "stop" ]] && [[ $STARTSTOP != "stop-all" ]]; then
  echo $USAGE
  exit 1
fi

bin=`dirname "$0"`
bin=`cd "$bin"; pwd`

# 17、加载config.sh
. "$bin"/config.sh

# 18、JobManager启动的主类，这是还是很重要的
ENTRYPOINT=standalonesession

if [[ $STARTSTOP == "start" ]] || [[ $STARTSTOP == "start-foreground" ]]; then
    # Add JobManager-specific JVM options
    export FLINK_ENV_JAVA_OPTS="${FLINK_ENV_JAVA_OPTS} ${FLINK_ENV_JAVA_OPTS_JM}"
    parseJmArgsAndExportLogs "${ARGS[@]}"

    args=("--configDir" "${FLINK_CONF_DIR}" "--executionMode" "cluster" "${args[@]}")
    if [ ! -z $HOST ]; then
        args+=("--host")
        args+=("${HOST}")
    fi

    if [ ! -z $WEBUIPORT ]; then
        args+=("--webui-port")
        args+=("${WEBUIPORT}")
    fi

    if [ ! -z "${DYNAMIC_PARAMETERS}" ]; then
        args=(${DYNAMIC_PARAMETERS[@]} "${args[@]}")
    fi
fi

if [[ $STARTSTOP == "start-foreground" ]]; then
    exec "${FLINK_BIN_DIR}"/flink-console.sh $ENTRYPOINT "${args[@]}"
else
    # 19、通过 flink-daemon.sh 启动脚本 standalonesession
    "${FLINK_BIN_DIR}"/flink-daemon.sh $STARTSTOP $ENTRYPOINT "${args[@]}"
fi

4、taskmanger.sh

# Start/stop a Flink TaskManager.
USAGE="Usage: taskmanager.sh (start|start-foreground|stop|stop-all)"

STARTSTOP=$1

ARGS=("${@:2}")

if [[ $STARTSTOP != "start" ]] && [[ $STARTSTOP != "start-foreground" ]] && [[ $STARTSTOP != "stop" ]] && [[ $STARTSTOP != "stop-all" ]]; then
  echo $USAGE
  exit 1
fi

bin=`dirname "$0"`
bin=`cd "$bin"; pwd`

. "$bin"/config.sh

# 20、定义变量taskexecutor
ENTRYPOINT=taskexecutor

if [[ $STARTSTOP == "start" ]] || [[ $STARTSTOP == "start-foreground" ]]; then

    # if no other JVM options are set, set the GC to G1
    if [ -z "${FLINK_ENV_JAVA_OPTS}" ] && [ -z "${FLINK_ENV_JAVA_OPTS_TM}" ]; then
        export JVM_ARGS="$JVM_ARGS -XX:+UseG1GC"
    fi

    # Add TaskManager-specific JVM options
    export FLINK_ENV_JAVA_OPTS="${FLINK_ENV_JAVA_OPTS} ${FLINK_ENV_JAVA_OPTS_TM}"

    # Startup parameters

    parseTmArgsAndExportLogs "${ARGS[@]}"

    if [ ! -z "${DYNAMIC_PARAMETERS}" ]; then
        ARGS=(${DYNAMIC_PARAMETERS[@]} "${ARGS[@]}")
    fi

    ARGS=("--configDir" "${FLINK_CONF_DIR}" "${ARGS[@]}")
fi

if [[ $STARTSTOP == "start-foreground" ]]; then
    exec "${FLINK_BIN_DIR}"/flink-console.sh $ENTRYPOINT "${ARGS[@]}"
else
    if [[ $FLINK_TM_COMPUTE_NUMA == "false" ]]; then
        # Start a single TaskManager
        "${FLINK_BIN_DIR}"/flink-daemon.sh $STARTSTOP $ENTRYPOINT "${ARGS[@]}"
    else
        # Example output from `numactl --show` on an AWS c4.8xlarge:
        # policy: default
        # preferred node: current
        # physcpubind: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
        # cpubind: 0 1
        # nodebind: 0 1
        # membind: 0 1
        read -ra NODE_LIST <<< $(numactl --show | grep "^nodebind: ")
        for NODE_ID in "${NODE_LIST[@]:1}"; do
            # Start a TaskManager for each NUMA node
            # 启动
            numactl --membind=$NODE_ID --cpunodebind=$NODE_ID -- "${FLINK_BIN_DIR}"/flink-daemon.sh $STARTSTOP $ENTRYPOINT "${ARGS[@]}"
        done
    fi
fi

5、flink-daemon.sh

# Start/stop a Flink daemon.
USAGE="Usage: flink-daemon.sh (start|stop|stop-all) (taskexecutor|zookeeper|historyserver|standalonesession|standalonejob|sql-gateway) [args]"

STARTSTOP=$1
DAEMON=$2
ARGS=("${@:3}") # get remaining arguments as array

bin=`dirname "$0"`
bin=`cd "$bin"; pwd`

# 加载配置
. "$bin"/config.sh

case $DAEMON in
    (taskexecutor)
        # 21、TaskExecutor启动的类，TaskManagerRunner
        CLASS_TO_RUN=org.apache.flink.runtime.taskexecutor.TaskManagerRunner
    ;;

    (zookeeper)
        CLASS_TO_RUN=org.apache.flink.runtime.zookeeper.FlinkZooKeeperQuorumPeer
    ;;

    (historyserver)
        CLASS_TO_RUN=org.apache.flink.runtime.webmonitor.history.HistoryServer
    ;;

    (standalonesession)
        # 22、JobManager启动类 StandaloneSessionClusterEntrypoint
        CLASS_TO_RUN=org.apache.flink.runtime.entrypoint.StandaloneSessionClusterEntrypoint
    ;;

    (standalonejob)
        CLASS_TO_RUN=org.apache.flink.container.entrypoint.StandaloneApplicationClusterEntryPoint
    ;;

    (sql-gateway)
        CLASS_TO_RUN=org.apache.flink.table.gateway.SqlGateway
        SQL_GATEWAY_CLASSPATH="`findSqlGatewayJar`":"`findFlinkPythonJar`"
    ;;

    (*)
        echo "Unknown daemon '${DAEMON}'. $USAGE."
        exit 1
    ;;
esac

if [ "$FLINK_IDENT_STRING" = "" ]; then
    FLINK_IDENT_STRING="$USER"
fi

FLINK_TM_CLASSPATH=`constructFlinkClassPath`

pid=$FLINK_PID_DIR/flink-$FLINK_IDENT_STRING-$DAEMON.pid

mkdir -p "$FLINK_PID_DIR"

# Log files for daemons are indexed from the process ID's position in the PID
# file. The following lock prevents a race condition during daemon startup
# when multiple daemons read, index, and write to the PID file concurrently.
# The lock is created on the PID directory since a lock file cannot be safely
# removed. The daemon is started with the lock closed and the lock remains
# active in this script until the script exits.
command -v flock >/dev/null 2>&1
if [[ $? -eq 0 ]]; then
    exec 200<"$FLINK_PID_DIR"
    flock 200
fi

# Ascending ID depending on number of lines in pid file.
# This allows us to start multiple daemon of each type.
id=$([ -f "$pid" ] && echo $(wc -l < "$pid") || echo "0")

FLINK_LOG_PREFIX="${FLINK_LOG_DIR}/flink-${FLINK_IDENT_STRING}-${DAEMON}-${id}-${HOSTNAME}"
log="${FLINK_LOG_PREFIX}.log"
out="${FLINK_LOG_PREFIX}.out"

log_setting=("-Dlog.file=${log}" "-Dlog4j.configuration=file:${FLINK_CONF_DIR}/log4j.properties" "-Dlog4j.configurationFile=file:${FLINK_CONF_DIR}/log4j.properties" "-Dlogback.configurationFile=file:${FLINK_CONF_DIR}/logback.xml")

function guaranteed_kill {
  to_stop_pid=$1
  daemon=$2

  # send sigterm for graceful shutdown
  kill $to_stop_pid
  # if timeout exists, use it
  if command -v timeout &> /dev/null ; then
    # wait 10 seconds for process to stop. By default, Flink kills the JVM 5 seconds after sigterm.
    timeout 10 tail --pid=$to_stop_pid -f /dev/null &> /dev/null
    if [ "$?" -eq 124 ]; then
      echo "Daemon $daemon didn't stop within 10 seconds. Killing it."
      # send sigkill
      kill -9 $to_stop_pid
    fi
  fi
}

case $STARTSTOP in

    (start)

        # Print a warning if daemons are already running on host
        if [ -f "$pid" ]; then
          active=()
          while IFS='' read -r p || [[ -n "$p" ]]; do
            kill -0 $p >/dev/null 2>&1
            if [ $? -eq 0 ]; then
              active+=($p)
            fi
          done < "${pid}"

          count="${#active[@]}"

          if [ ${count} -gt 0 ]; then
            echo "[INFO] $count instance(s) of $DAEMON are already running on $HOSTNAME."
          fi
        fi

        # Evaluate user options for local variable expansion
        FLINK_ENV_JAVA_OPTS=$(eval echo ${FLINK_ENV_JAVA_OPTS})

        echo "Starting $DAEMON daemon on host $HOSTNAME."
        "$JAVA_RUN" $JVM_ARGS ${FLINK_ENV_JAVA_OPTS} "${log_setting[@]}" -classpath "`manglePathList "$FLINK_TM_CLASSPATH:$SQL_GATEWAY_CLASSPATH:$INTERNAL_HADOOP_CLASSPATHS"`" ${CLASS_TO_RUN} "${ARGS[@]}" > "$out" 200<&- 2>&1 < /dev/null &

        mypid=$!

        # Add to pid file if successful start
        if [[ ${mypid} =~ ${IS_NUMBER} ]] && kill -0 $mypid > /dev/null 2>&1 ; then
            echo $mypid >> "$pid"
        else
            echo "Error starting $DAEMON daemon."
            exit 1
        fi
    ;;

    (stop)
        if [ -f "$pid" ]; then
            # Remove last in pid file
            to_stop=$(tail -n 1 "$pid")

            if [ -z $to_stop ]; then
                rm "$pid" # If all stopped, clean up pid file
                echo "No $DAEMON daemon to stop on host $HOSTNAME."
            else
                sed \$d "$pid" > "$pid.tmp" # all but last line

                # If all stopped, clean up pid file
                [ $(wc -l < "$pid.tmp") -eq 0 ] && rm "$pid" "$pid.tmp" || mv "$pid.tmp" "$pid"

                if kill -0 $to_stop > /dev/null 2>&1; then
                    echo "Stopping $DAEMON daemon (pid: $to_stop) on host $HOSTNAME."
                    guaranteed_kill $to_stop $DAEMON
                else
                    echo "No $DAEMON daemon (pid: $to_stop) is running anymore on $HOSTNAME."
                fi
            fi
        else
            echo "No $DAEMON daemon to stop on host $HOSTNAME."
        fi
    ;;

    (stop-all)
        if [ -f "$pid" ]; then
            mv "$pid" "${pid}.tmp"

            while read to_stop; do
                if kill -0 $to_stop > /dev/null 2>&1; then
                    echo "Stopping $DAEMON daemon (pid: $to_stop) on host $HOSTNAME."
                    guaranteed_kill $to_stop $DAEMON
                else
                    echo "Skipping $DAEMON daemon (pid: $to_stop), because it is not running anymore on $HOSTNAME."
                fi
            done < "${pid}.tmp"
            rm "${pid}.tmp"
        fi
    ;;

    (*)
        echo "Unexpected argument '$STARTSTOP'. $USAGE."
        exit 1
    ;;

esac

6、总结

启动集群会加载config.sh文件，会获取Masters和Slavers配置信息

• jobmanager.sh 来启动 JobManager
• taskmanager.sh 来启动 TaskManager

都通过flink-daemon.sh脚本来启动 JVM 进程，分析flink-daemon.sh脚本发现

• JobManager 的启动实现类是 : StandaloneSessionClusterEntrypoint
• TaskManager的启实现类是 : TaskManagerRunner

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