hadoop

#!/usr/bin/env bash

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MYNAME="${BASH_SOURCE-$0}"
HADOOP_SHELL_EXECNAME="${MYNAME##*/}"

## @description  build up the hadoop command's usage text.
## @audience     public
## @stability    stable
## @replaceable  no
function hadoop_usage
{
  hadoop_add_option "buildpaths" "attempt to add class files from build tree"
  hadoop_add_option "hostnames list[,of,host,names]" "hosts to use in slave mode"
  hadoop_add_option "loglevel level" "set the log4j level for this command"
  hadoop_add_option "hosts filename" "list of hosts to use in slave mode"
  hadoop_add_option "workers" "turn on worker mode"

  hadoop_add_subcommand "checknative" client "check native Hadoop and compression libraries availability"
  hadoop_add_subcommand "classpath" client "prints the class path needed to get the Hadoop jar and the required libraries"
  hadoop_add_subcommand "conftest" client "validate configuration XML files"
  hadoop_add_subcommand "credential" client "interact with credential providers"
  hadoop_add_subcommand "daemonlog" admin "get/set the log level for each daemon"
  hadoop_add_subcommand "dtutil" client "operations related to delegation tokens"
  hadoop_add_subcommand "envvars" client "display computed Hadoop environment variables"
  hadoop_add_subcommand "fs" client "run a generic filesystem user client"
  hadoop_add_subcommand "jar <jar>" client "run a jar file. NOTE: please use \"yarn jar\" to launch YARN applications, not this command."
  hadoop_add_subcommand "jnipath" client "prints the java.library.path"
  hadoop_add_subcommand "kerbname" client "show auth_to_local principal conversion"
  hadoop_add_subcommand "key" client "manage keys via the KeyProvider"
  hadoop_add_subcommand "trace" client "view and modify Hadoop tracing settings"
  hadoop_add_subcommand "version" client "print the version"
  hadoop_generate_usage "${HADOOP_SHELL_EXECNAME}" true
}

## @description  Default command handler for hadoop command
## @audience     public
## @stability    stable
## @replaceable  no
## @param        CLI arguments
function hadoopcmd_case
{
  subcmd=$1
  shift

  case ${subcmd} in
    balancer|datanode|dfs|dfsadmin|dfsgroups|  \
    namenode|secondarynamenode|fsck|fetchdt|oiv| \
    portmap|nfs3)
      hadoop_error "WARNING: Use of this script to execute ${subcmd} is deprecated."
      subcmd=${subcmd/dfsgroups/groups}
      hadoop_error "WARNING: Attempting to execute replacement \"hdfs ${subcmd}\" instead."
      hadoop_error ""
      #try to locate hdfs and if present, delegate to it.
      if [[ -f "${HADOOP_HDFS_HOME}/bin/hdfs" ]]; then
        exec "${HADOOP_HDFS_HOME}/bin/hdfs" \
          --config "${HADOOP_CONF_DIR}" "${subcmd}"  "$@"
      elif [[ -f "${HADOOP_HOME}/bin/hdfs" ]]; then
        exec "${HADOOP_HOME}/bin/hdfs" \
          --config "${HADOOP_CONF_DIR}" "${subcmd}" "$@"
      else
        hadoop_error "HADOOP_HDFS_HOME not found!"
        exit 1
      fi
    ;;

    #mapred commands for backwards compatibility
    pipes|job|queue|mrgroups|mradmin|jobtracker|tasktracker)
      hadoop_error "WARNING: Use of this script to execute ${subcmd} is deprecated."
      subcmd=${subcmd/mrgroups/groups}
      hadoop_error "WARNING: Attempting to execute replacement \"mapred ${subcmd}\" instead."
      hadoop_error ""
      #try to locate mapred and if present, delegate to it.
      if [[ -f "${HADOOP_MAPRED_HOME}/bin/mapred" ]]; then
        exec "${HADOOP_MAPRED_HOME}/bin/mapred" \
        --config "${HADOOP_CONF_DIR}" "${subcmd}" "$@"
      elif [[ -f "${HADOOP_HOME}/bin/mapred" ]]; then
        exec "${HADOOP_HOME}/bin/mapred" \
        --config "${HADOOP_CONF_DIR}" "${subcmd}" "$@"
      else
        hadoop_error "HADOOP_MAPRED_HOME not found!"
        exit 1
      fi
    ;;
    checknative)
      HADOOP_CLASSNAME=org.apache.hadoop.util.NativeLibraryChecker
    ;;
    classpath)
      hadoop_do_classpath_subcommand HADOOP_CLASSNAME "$@"
    ;;
    conftest)
      HADOOP_CLASSNAME=org.apache.hadoop.util.ConfTest
    ;;
    credential)
      HADOOP_CLASSNAME=org.apache.hadoop.security.alias.CredentialShell
    ;;
    daemonlog)
      HADOOP_CLASSNAME=org.apache.hadoop.log.LogLevel
    ;;
    dtutil)
      HADOOP_CLASSNAME=org.apache.hadoop.security.token.DtUtilShell
    ;;
    envvars)
      echo "JAVA_HOME='${JAVA_HOME}'"
      echo "HADOOP_COMMON_HOME='${HADOOP_COMMON_HOME}'"
      echo "HADOOP_COMMON_DIR='${HADOOP_COMMON_DIR}'"
      echo "HADOOP_COMMON_LIB_JARS_DIR='${HADOOP_COMMON_LIB_JARS_DIR}'"
      echo "HADOOP_COMMON_LIB_NATIVE_DIR='${HADOOP_COMMON_LIB_NATIVE_DIR}'"
      echo "HADOOP_CONF_DIR='${HADOOP_CONF_DIR}'"
      echo "HADOOP_TOOLS_HOME='${HADOOP_TOOLS_HOME}'"
      echo "HADOOP_TOOLS_DIR='${HADOOP_TOOLS_DIR}'"
      echo "HADOOP_TOOLS_LIB_JARS_DIR='${HADOOP_TOOLS_LIB_JARS_DIR}'"
      exit 0
    ;;
    fs)
      HADOOP_CLASSNAME=org.apache.hadoop.fs.FsShell
    ;;
    jar)
      if [[ -n "${YARN_OPTS}" ]] || [[ -n "${YARN_CLIENT_OPTS}" ]]; then
        hadoop_error "WARNING: Use \"yarn jar\" to launch YARN applications."
      fi
      HADOOP_CLASSNAME=org.apache.hadoop.util.RunJar
    ;;
    jnipath)
      hadoop_finalize
      echo "${JAVA_LIBRARY_PATH}"
      exit 0
    ;;
    kerbname)
      HADOOP_CLASSNAME=org.apache.hadoop.security.HadoopKerberosName
    ;;
    key)
      HADOOP_CLASSNAME=org.apache.hadoop.crypto.key.KeyShell
    ;;
    trace)
      HADOOP_CLASSNAME=org.apache.hadoop.tracing.TraceAdmin
    ;;
    version)
      HADOOP_CLASSNAME=org.apache.hadoop.util.VersionInfo
    ;;
    *)
      HADOOP_CLASSNAME="${subcmd}"
      if ! hadoop_validate_classname "${HADOOP_CLASSNAME}"; then
        hadoop_exit_with_usage 1
      fi
    ;;
  esac
}

# This script runs the hadoop core commands.

# let's locate libexec...
if [[ -n "${HADOOP_HOME}" ]]; then
  HADOOP_DEFAULT_LIBEXEC_DIR="${HADOOP_HOME}/libexec"
else
  bin=$(cd -P -- "$(dirname -- "${MYNAME}")" >/dev/null && pwd -P)
  HADOOP_DEFAULT_LIBEXEC_DIR="${bin}/../libexec"
fi

HADOOP_LIBEXEC_DIR="${HADOOP_LIBEXEC_DIR:-$HADOOP_DEFAULT_LIBEXEC_DIR}"
HADOOP_NEW_CONFIG=true
if [[ -f "${HADOOP_LIBEXEC_DIR}/hadoop-config.sh" ]]; then
  # shellcheck source=./hadoop-common-project/hadoop-common/src/main/bin/hadoop-config.sh
  . "${HADOOP_LIBEXEC_DIR}/hadoop-config.sh"
else
  echo "ERROR: Cannot execute ${HADOOP_LIBEXEC_DIR}/hadoop-config.sh." 2>&1
  exit 1
fi

# now that we have support code, let's abs MYNAME so we can use it later
MYNAME=$(hadoop_abs "${MYNAME}")

if [[ $# = 0 ]]; then
  hadoop_exit_with_usage 1
fi

HADOOP_SUBCMD=$1
shift

if hadoop_need_reexec hadoop "${HADOOP_SUBCMD}"; then
  hadoop_uservar_su hadoop "${HADOOP_SUBCMD}" \
    "${MYNAME}" \
    "--reexec" \
    "${HADOOP_USER_PARAMS[@]}"
  exit $?
fi

hadoop_verify_user_perm "${HADOOP_SHELL_EXECNAME}" "${HADOOP_SUBCMD}"

HADOOP_SUBCMD_ARGS=("$@")

if declare -f hadoop_subcommand_"${HADOOP_SUBCMD}" >/dev/null 2>&1; then
  hadoop_debug "Calling dynamically: hadoop_subcommand_${HADOOP_SUBCMD} ${HADOOP_SUBCMD_ARGS[*]}"
  "hadoop_subcommand_${HADOOP_SUBCMD}" "${HADOOP_SUBCMD_ARGS[@]}"
else
  hadoopcmd_case "${HADOOP_SUBCMD}" "${HADOOP_SUBCMD_ARGS[@]}"
fi

hadoop_add_client_opts

if [[ ${HADOOP_WORKER_MODE} = true ]]; then
  hadoop_common_worker_mode_execute "${HADOOP_COMMON_HOME}/bin/hadoop" "${HADOOP_USER_PARAMS[@]}"
  exit $?
fi

hadoop_subcommand_opts "${HADOOP_SHELL_EXECNAME}" "${HADOOP_SUBCMD}"

# everything is in globals at this point, so call the generic handler
hadoop_generic_java_subcmd_handler