#! /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.
# */
#
# The hbase command script.  Based on the hadoop command script putting
# in hbase classes, libs and configurations ahead of hadoop's.
#
# TODO: Narrow the amount of duplicated code.
#
# Environment Variables:
#
#   JAVA_HOME        The java implementation to use.  Overrides JAVA_HOME.
#
#   HBASE_CLASSPATH  Extra Java CLASSPATH entries.
#
#   HBASE_CLASSPATH_PREFIX Extra Java CLASSPATH entries that should be
#                    prefixed to the system classpath.
#
#   HBASE_HEAPSIZE   The maximum amount of heap to use.
#                    Default is unset and uses the JVMs default setting
#                    (usually 1/4th of the available memory).
#
#   HBASE_LIBRARY_PATH  HBase additions to JAVA_LIBRARY_PATH for adding
#                    native libraries.
#
#   HBASE_OPTS       Extra Java runtime options.
#
#   HBASE_CONF_DIR   Alternate conf dir. Default is ${HBASE_HOME}/conf.
#
#   HBASE_ROOT_LOGGER The root appender. Default is INFO,console
#
#   JRUBY_HOME       JRuby path: $JRUBY_HOME/lib/jruby.jar should exist.
#                    Defaults to the jar packaged with HBase.
#
#   JRUBY_OPTS       Extra options (eg '--1.9') passed to hbase.
#                    Empty by default.
#
#   HBASE_SHELL_OPTS Extra options passed to the hbase shell.
#                    Empty by default.
#
bin=`dirname "$0"`
bin=`cd "$bin">/dev/null; pwd`

read -d '' options_string << EOF
Options:
  --config DIR         Configuration direction to use. Default: ./conf
  --hosts HOSTS        Override the list in 'regionservers' file
  --auth-as-server     Authenticate to ZooKeeper using servers configuration
  --internal-classpath Skip attempting to use client facing jars (WARNING: unstable results between versions)
  --help or -h         Print this help message
EOF
show_usage() {
  echo "Usage: hbase [<options>] <command> [<args>]"
  echo "$options_string"
  echo ""
  echo "Commands:"
  echo "Some commands take arguments. Pass no args or -h for usage."
  echo "  shell            Run the HBase shell"
  echo "  hbck             Run the HBase 'fsck' tool. Defaults read-only hbck1."
  echo "                   Pass '-j /path/to/HBCK2.jar' to run hbase-2.x HBCK2."
  echo "  snapshot         Tool for managing snapshots"
  if [ "${in_omnibus_tarball}" = "true" ]; then
    echo "  wal              Write-ahead-log analyzer"
    echo "  hfile            Store file analyzer"
    echo "  zkcli            Run the ZooKeeper shell"
    echo "  master           Run an HBase HMaster node"
    echo "  regionserver     Run an HBase HRegionServer node"
    echo "  zookeeper        Run a ZooKeeper server"
    echo "  rest             Run an HBase REST server"
    echo "  thrift           Run the HBase Thrift server"
    echo "  thrift2          Run the HBase Thrift2 server"
    echo "  clean            Run the HBase clean up script"
  fi
  echo "  classpath        Dump hbase CLASSPATH"
  echo "  mapredcp         Dump CLASSPATH entries required by mapreduce"
  echo "  pe               Run PerformanceEvaluation"
  echo "  ltt              Run LoadTestTool"
  echo "  canary           Run the Canary tool"
  echo "  version          Print the version"
  echo "  backup           Backup tables for recovery"
  echo "  restore          Restore tables from existing backup image"
  echo "  completebulkload Run BulkLoadHFiles tool"
  echo "  regionsplitter   Run RegionSplitter tool"
  echo "  rowcounter       Run RowCounter tool"
  echo "  cellcounter      Run CellCounter tool"
  echo "  pre-upgrade      Run Pre-Upgrade validator tool"
  echo "  hbtop            Run HBTop tool"
  echo "  CLASSNAME        Run the class named CLASSNAME"
}

if [ "--help" = "$1" ] || [ "-h" = "$1" ]; then
  show_usage
  exit 0
fi

# This will set HBASE_HOME, etc.
. "$bin"/hbase-config.sh

cygwin=false
case "`uname`" in
CYGWIN*) cygwin=true;;
esac

# Detect if we are in hbase sources dir
in_dev_env=false
if [ -d "${HBASE_HOME}/target" ]; then
  in_dev_env=true
fi

# Detect if we are in the omnibus tarball
in_omnibus_tarball="false"
if [ -f "${HBASE_HOME}/bin/hbase-daemons.sh" ]; then
  in_omnibus_tarball="true"
fi

# if no args specified, show usage
if [ $# = 0 ]; then
  show_usage
  exit 1
fi

# get arguments
COMMAND=$1
shift

JAVA=$JAVA_HOME/bin/java

# override default settings for this command, if applicable
if [ -f "$HBASE_HOME/conf/hbase-env-$COMMAND.sh" ]; then
  . "$HBASE_HOME/conf/hbase-env-$COMMAND.sh"
fi

# establish a default value for HBASE_OPTS if it's not already set. For now,
# all we set is the garbage collector.
if [ -z "${HBASE_OPTS}" ] ; then
  major_version_number="$(parse_java_major_version "$(read_java_version)")"
  case "$major_version_number" in
  8|9|10)
    HBASE_OPTS="-XX:+UseConcMarkSweepGC"
    ;;
  11|*)
    HBASE_OPTS="-XX:+UseG1GC"
    ;;
  esac
  export HBASE_OPTS
fi

add_size_suffix() {
    # add an 'm' suffix if the argument is missing one, otherwise use whats there
    local val="$1"
    local lastchar=${val: -1}
    if [[ "mMgG" == *$lastchar* ]]; then
        echo $val
    else
        echo ${val}m
    fi
}

if [[ -n "$HBASE_HEAPSIZE" ]]; then
    JAVA_HEAP_MAX="-Xmx$(add_size_suffix $HBASE_HEAPSIZE)"
fi

if [[ -n "$HBASE_OFFHEAPSIZE" ]]; then
    JAVA_OFFHEAP_MAX="-XX:MaxDirectMemorySize=$(add_size_suffix $HBASE_OFFHEAPSIZE)"
fi

# so that filenames w/ spaces are handled correctly in loops below
ORIG_IFS=$IFS
IFS=

# CLASSPATH initially contains $HBASE_CONF_DIR
CLASSPATH="${HBASE_CONF_DIR}"
CLASSPATH=${CLASSPATH}:$JAVA_HOME/lib/tools.jar

add_to_cp_if_exists() {
  if [ -d "$@" ]; then
    CLASSPATH=${CLASSPATH}:"$@"
  fi
}

# For releases, add hbase & webapps to CLASSPATH
# Webapps must come first else it messes up Jetty
if [ -d "$HBASE_HOME/hbase-webapps" ]; then
  add_to_cp_if_exists "${HBASE_HOME}"
fi
#add if we are in a dev environment
if [ -d "$HBASE_HOME/hbase-server/target/hbase-webapps" ]; then
  if [ "$COMMAND" = "thrift" ] ; then
    add_to_cp_if_exists "${HBASE_HOME}/hbase-thrift/target"
  elif [ "$COMMAND" = "thrift2" ] ; then
    add_to_cp_if_exists "${HBASE_HOME}/hbase-thrift/target"
  elif [ "$COMMAND" = "rest" ] ; then
    add_to_cp_if_exists "${HBASE_HOME}/hbase-rest/target"
  else
    add_to_cp_if_exists "${HBASE_HOME}/hbase-server/target"
    # Needed for GetJavaProperty check below
    add_to_cp_if_exists "${HBASE_HOME}/hbase-server/target/classes"
  fi
fi

#If avail, add Hadoop to the CLASSPATH and to the JAVA_LIBRARY_PATH
# Allow this functionality to be disabled
if [ "$HBASE_DISABLE_HADOOP_CLASSPATH_LOOKUP" != "true" ] ; then
  HADOOP_IN_PATH=$(PATH="${HADOOP_HOME:-${HADOOP_PREFIX}}/bin:$PATH" which hadoop 2>/dev/null)
fi

# Add libs to CLASSPATH
declare shaded_jar

if [ "${INTERNAL_CLASSPATH}" != "true" ]; then
  # find our shaded jars
  declare shaded_client
  declare shaded_client_byo_hadoop
  declare shaded_mapreduce
  for f in "${HBASE_HOME}"/lib/shaded-clients/hbase-shaded-client*.jar; do
    if [[ "${f}" =~ byo-hadoop ]]; then
      shaded_client_byo_hadoop="${f}"
    else
      shaded_client="${f}"
    fi
  done
  for f in "${HBASE_HOME}"/lib/shaded-clients/hbase-shaded-mapreduce*.jar; do
    shaded_mapreduce="${f}"
  done

  # If command can use our shaded client, use it
  declare -a commands_in_client_jar=("classpath" "version" "hbtop")
  for c in "${commands_in_client_jar[@]}"; do
    if [ "${COMMAND}" = "${c}" ]; then
      if [ -n "${HADOOP_IN_PATH}" ] && [ -f "${HADOOP_IN_PATH}" ]; then
        # If we didn't find a jar above, this will just be blank and the
        # check below will then default back to the internal classpath.
        shaded_jar="${shaded_client_byo_hadoop}"
      else
        # If we didn't find a jar above, this will just be blank and the
        # check below will then default back to the internal classpath.
        shaded_jar="${shaded_client}"
      fi
      break
    fi
  done

  # If command needs our shaded mapreduce, use it
  # N.B "mapredcp" is not included here because in the shaded case it skips our built classpath
  declare -a commands_in_mr_jar=("hbck" "snapshot" "regionsplitter" "pre-upgrade")
  for c in "${commands_in_mr_jar[@]}"; do
    if [ "${COMMAND}" = "${c}" ]; then
      # If we didn't find a jar above, this will just be blank and the
      # check below will then default back to the internal classpath.
      shaded_jar="${shaded_mapreduce}"
      break
    fi
  done

  # Some commands specifically only can use shaded mapreduce when we'll get a full hadoop classpath at runtime
  if [ -n "${HADOOP_IN_PATH}" ] && [ -f "${HADOOP_IN_PATH}" ]; then
    declare -a commands_in_mr_need_hadoop=("backup" "restore" "rowcounter" "cellcounter")
    for c in "${commands_in_mr_need_hadoop[@]}"; do
      if [ "${COMMAND}" = "${c}" ]; then
        # If we didn't find a jar above, this will just be blank and the
        # check below will then default back to the internal classpath.
        shaded_jar="${shaded_mapreduce}"
        break
      fi
    done
  fi
fi


if [ -n "${shaded_jar}" ] && [ -f "${shaded_jar}" ]; then
  CLASSPATH="${CLASSPATH}:${shaded_jar}"
# fall through to grabbing all the lib jars and hope we're in the omnibus tarball
#
# N.B. shell specifically can't rely on the shaded artifacts because RSGroups is only
# available as non-shaded
#
# N.B. pe and ltt can't easily rely on shaded artifacts because they live in hbase-mapreduce:test-jar
# and need some other jars that haven't been relocated. Currently enumerating that list
# is too hard to be worth it.
#
else
  for f in $HBASE_HOME/lib/*.jar; do
    CLASSPATH=${CLASSPATH}:$f;
  done
  # make it easier to check for shaded/not later on.
  shaded_jar=""
fi
for f in "${HBASE_HOME}"/lib/client-facing-thirdparty/*.jar; do
  if [[ ! "${f}" =~ ^.*/htrace-core-3.*\.jar$ ]] && \
     [ "${f}" != "htrace-core.jar$" ] && \
     [[ ! "${f}" =~ ^.*/slf4j-log4j.*$ ]]; then
    CLASSPATH="${CLASSPATH}:${f}"
  fi
done

# default log directory & file
if [ "$HBASE_LOG_DIR" = "" ]; then
  HBASE_LOG_DIR="$HBASE_HOME/logs"
fi
if [ "$HBASE_LOGFILE" = "" ]; then
  HBASE_LOGFILE='hbase.log'
fi

function append_path() {
  if [ -z "$1" ]; then
    echo "$2"
  else
    echo "$1:$2"
  fi
}

JAVA_PLATFORM=""

# if HBASE_LIBRARY_PATH is defined lets use it as first or second option
if [ "$HBASE_LIBRARY_PATH" != "" ]; then
  JAVA_LIBRARY_PATH=$(append_path "$JAVA_LIBRARY_PATH" "$HBASE_LIBRARY_PATH")
fi

#If configured and available, add Hadoop to the CLASSPATH and to the JAVA_LIBRARY_PATH
if [ -n "${HADOOP_IN_PATH}" ] && [ -f "${HADOOP_IN_PATH}" ]; then
  # If built hbase, temporarily add hbase-server*.jar to classpath for GetJavaProperty
  # Exclude hbase-server*-tests.jar
  temporary_cp=
  for f in "${HBASE_HOME}"/lib/hbase-server*.jar; do
    if [[ ! "${f}" =~ ^.*\-tests\.jar$ ]]; then
      temporary_cp=":$f"
    fi
  done
  HADOOP_JAVA_LIBRARY_PATH=$(HADOOP_CLASSPATH="$CLASSPATH${temporary_cp}" "${HADOOP_IN_PATH}" \
                             org.apache.hadoop.hbase.util.GetJavaProperty java.library.path)
  if [ -n "$HADOOP_JAVA_LIBRARY_PATH" ]; then
    JAVA_LIBRARY_PATH=$(append_path "${JAVA_LIBRARY_PATH}" "$HADOOP_JAVA_LIBRARY_PATH")
  fi
  CLASSPATH=$(append_path "${CLASSPATH}" "$(${HADOOP_IN_PATH} classpath 2>/dev/null)")
else
  # Otherwise, if we're providing Hadoop we should include htrace 3 if we were built with a version that needs it.
  for f in "${HBASE_HOME}"/lib/client-facing-thirdparty/htrace-core-3*.jar "${HBASE_HOME}"/lib/client-facing-thirdparty/htrace-core.jar; do
    if [ -f "${f}" ]; then
      CLASSPATH="${CLASSPATH}:${f}"
      break
    fi
  done
  # Some commands require special handling when using shaded jars. For these cases, we rely on hbase-shaded-mapreduce
  # instead of hbase-shaded-client* because we make use of some IA.Private classes that aren't in the latter. However,
  # we don't invoke them using the "hadoop jar" command so we need to ensure there are some Hadoop classes available
  # when we're not doing runtime hadoop classpath lookup.
  #
  # luckily the set of classes we need are those packaged in the shaded-client.
  for c in "${commands_in_mr_jar[@]}"; do
    if [ "${COMMAND}" = "${c}" ] && [ -n "${shaded_jar}" ]; then
      CLASSPATH="${CLASSPATH}:${shaded_client:?We couldn\'t find the shaded client jar even though we did find the shaded MR jar. for command ${COMMAND} we need both. please use --internal-classpath as a workaround.}"
      break
    fi
  done
fi

# Add user-specified CLASSPATH last
if [ "$HBASE_CLASSPATH" != "" ]; then
  CLASSPATH=${CLASSPATH}:${HBASE_CLASSPATH}
fi

# Add user-specified CLASSPATH prefix first
if [ "$HBASE_CLASSPATH_PREFIX" != "" ]; then
  CLASSPATH=${HBASE_CLASSPATH_PREFIX}:${CLASSPATH}
fi

# cygwin path translation
if $cygwin; then
  CLASSPATH=`cygpath -p -w "$CLASSPATH"`
  HBASE_HOME=`cygpath -d "$HBASE_HOME"`
  HBASE_LOG_DIR=`cygpath -d "$HBASE_LOG_DIR"`
fi

if [ -d "${HBASE_HOME}/build/native" -o -d "${HBASE_HOME}/lib/native" ]; then
  if [ -z $JAVA_PLATFORM ]; then
    JAVA_PLATFORM=`CLASSPATH=${CLASSPATH} ${JAVA} org.apache.hadoop.util.PlatformName | sed -e "s/ /_/g"`
  fi
  if [ -d "$HBASE_HOME/build/native" ]; then
    JAVA_LIBRARY_PATH=$(append_path "$JAVA_LIBRARY_PATH" "${HBASE_HOME}/build/native/${JAVA_PLATFORM}/lib")
  fi

  if [ -d "${HBASE_HOME}/lib/native" ]; then
    JAVA_LIBRARY_PATH=$(append_path "$JAVA_LIBRARY_PATH" "${HBASE_HOME}/lib/native/${JAVA_PLATFORM}")
  fi
fi

# cygwin path translation
if $cygwin; then
  JAVA_LIBRARY_PATH=`cygpath -p "$JAVA_LIBRARY_PATH"`
fi

# restore ordinary behaviour
unset IFS

#Set the right GC options based on the what we are running
declare -a server_cmds=("master" "regionserver" "thrift" "thrift2" "rest" "avro" "zookeeper")
for cmd in ${server_cmds[@]}; do
	if [[ $cmd == $COMMAND ]]; then
		server=true
		break
	fi
done

if [[ $server ]]; then
	HBASE_OPTS="$HBASE_OPTS $SERVER_GC_OPTS"
else
	HBASE_OPTS="$HBASE_OPTS $CLIENT_GC_OPTS"
fi

if [ "$AUTH_AS_SERVER" == "true" ] || [ "$COMMAND" = "hbck" ]; then
   if [ -n "$HBASE_SERVER_JAAS_OPTS" ]; then
     HBASE_OPTS="$HBASE_OPTS $HBASE_SERVER_JAAS_OPTS"
   else
     HBASE_OPTS="$HBASE_OPTS $HBASE_REGIONSERVER_OPTS"
   fi
fi

# check if the command needs jline
declare -a jline_cmds=("zkcli" "org.apache.hadoop.hbase.zookeeper.ZKMainServer")
for cmd in "${jline_cmds[@]}"; do
  if [[ $cmd == "$COMMAND" ]]; then
    jline_needed=true
    break
  fi
done

# for jruby
# (1) for the commands which need jruby (see jruby_cmds defined below)
#     A. when JRUBY_HOME is specified explicitly, eg. export JRUBY_HOME=/usr/local/share/jruby
#        CLASSPATH and HBASE_OPTS are updated according to JRUBY_HOME specified
#     B. when JRUBY_HOME is not specified explicitly
#        add jruby packaged with HBase to CLASSPATH
# (2) for other commands, do nothing

# check if the commmand needs jruby
declare -a jruby_cmds=("shell" "org.jruby.Main")
for cmd in "${jruby_cmds[@]}"; do
  if [[ $cmd == "$COMMAND" ]]; then
    jruby_needed=true
    break
  fi
done

add_maven_deps_to_classpath() {
  f="${HBASE_HOME}/hbase-build-configuration/target/$1"

  if [ ! -f "${f}" ]; then
      echo "As this is a development environment, we need ${f} to be generated from maven (command: mvn install -DskipTests)"
      exit 1
  fi
  CLASSPATH=${CLASSPATH}:$(cat "${f}")
}

add_jdk11_deps_to_classpath() {
  for f in ${HBASE_HOME}/lib/jdk11/*; do
    if [ -f "${f}" ]; then
      CLASSPATH="${CLASSPATH}:${f}"
    fi
  done
}

#Add the development env class path stuff
if $in_dev_env; then
  add_maven_deps_to_classpath "cached_classpath.txt"

  if [[ $jline_needed ]]; then
    add_maven_deps_to_classpath "cached_classpath_jline.txt"
  elif [[ $jruby_needed ]]; then
    add_maven_deps_to_classpath "cached_classpath_jruby.txt"
  fi
fi

# the command needs jruby
if [[ $jruby_needed ]]; then
  if [ "$JRUBY_HOME" != "" ]; then  # JRUBY_HOME is specified explicitly, eg. export JRUBY_HOME=/usr/local/share/jruby
    # add jruby.jar into CLASSPATH
    CLASSPATH="$JRUBY_HOME/lib/jruby.jar:$CLASSPATH"

    # add jruby to HBASE_OPTS
    HBASE_OPTS="$HBASE_OPTS -Djruby.home=$JRUBY_HOME -Djruby.lib=$JRUBY_HOME/lib"

  else  # JRUBY_HOME is not specified explicitly
    if ! $in_dev_env; then  # not in dev environment
      # add jruby packaged with HBase to CLASSPATH
      JRUBY_PACKAGED_WITH_HBASE="$HBASE_HOME/lib/ruby/*.jar"
      for jruby_jar in $JRUBY_PACKAGED_WITH_HBASE; do
        CLASSPATH=$jruby_jar:$CLASSPATH;
      done
    fi
  fi
fi

# figure out which class to run
if [ "$COMMAND" = "shell" ] ; then
	#find the hbase ruby sources
  # assume we are in a binary install if lib/ruby exists
  if [ -d "$HBASE_HOME/lib/ruby" ]; then
    # We want jruby to consume these things rather than our bootstrap script;
    # jruby will look for the env variable 'JRUBY_OPTS'.
    JRUBY_OPTS="${JRUBY_OPTS} -X+O"
    export JRUBY_OPTS
    # hbase-shell.jar contains a 'jar-bootstrap.rb'
    # for more info see
    # https://github.com/jruby/jruby/wiki/StandaloneJarsAndClasses#standalone-executable-jar-files
    CLASS="org.jruby.JarBootstrapMain"
  # otherwise assume we are running in a source checkout
  else
    HBASE_OPTS="$HBASE_OPTS -Dhbase.ruby.sources=$HBASE_HOME/hbase-shell/src/main/ruby"
    CLASS="org.jruby.Main -X+O ${JRUBY_OPTS} ${HBASE_HOME}/hbase-shell/src/main/ruby/jar-bootstrap.rb"
  fi
  HBASE_OPTS="$HBASE_OPTS $HBASE_SHELL_OPTS"
elif [ "$COMMAND" = "hbck" ] ; then
  # Look for the -j /path/to/HBCK2.jar parameter. Else pass through to hbck.
  case "${1}" in
    -j)
    # Found -j parameter. Add arg to CLASSPATH and set CLASS to HBCK2.
    shift
    JAR="${1}"
    if [ ! -f "${JAR}" ]; then
      echo "${JAR} file not found!"
      echo "Usage: hbase [<options>] hbck -jar /path/to/HBCK2.jar [<args>]"
      exit 1
    fi
    CLASSPATH="${JAR}:${CLASSPATH}";
    CLASS="org.apache.hbase.HBCK2"
    shift # past argument=value
    ;;
    *)
    CLASS='org.apache.hadoop.hbase.util.HBaseFsck'
    ;;
  esac
elif [ "$COMMAND" = "wal" ] ; then
  CLASS='org.apache.hadoop.hbase.wal.WALPrettyPrinter'
elif [ "$COMMAND" = "hfile" ] ; then
  CLASS='org.apache.hadoop.hbase.io.hfile.HFilePrettyPrinter'
elif [ "$COMMAND" = "zkcli" ] ; then
  CLASS="org.apache.hadoop.hbase.zookeeper.ZKMainServer"
  for f in $HBASE_HOME/lib/zkcli/*.jar; do
    CLASSPATH="${CLASSPATH}:$f";
  done
elif [ "$COMMAND" = "backup" ] ; then
  CLASS='org.apache.hadoop.hbase.backup.BackupDriver'
  if [ -n "${shaded_jar}" ] ; then
    for f in "${HBASE_HOME}"/lib/hbase-backup*.jar; do
      if [ -f "${f}" ]; then
        CLASSPATH="${CLASSPATH}:${f}"
        break
      fi
    done
  fi
elif [ "$COMMAND" = "restore" ] ; then
  CLASS='org.apache.hadoop.hbase.backup.RestoreDriver'
  if [ -n "${shaded_jar}" ] ; then
    for f in "${HBASE_HOME}"/lib/hbase-backup*.jar; do
      if [ -f "${f}" ]; then
        CLASSPATH="${CLASSPATH}:${f}"
        break
      fi
    done
    for f in "${HBASE_HOME}"/lib/commons-lang3*.jar; do
      if [ -f "${f}" ]; then
        CLASSPATH="${CLASSPATH}:${f}"
        break
      fi
    done
  fi
elif [ "$COMMAND" = "upgrade" ] ; then
  echo "This command was used to upgrade to HBase 0.96, it was removed in HBase 2.0.0."
  echo "Please follow the documentation at http://hbase.apache.org/book.html#upgrading."
  exit 1
elif [ "$COMMAND" = "snapshot" ] ; then
  SUBCOMMAND=$1
  shift
  if [ "$SUBCOMMAND" = "create" ] ; then
    CLASS="org.apache.hadoop.hbase.snapshot.CreateSnapshot"
  elif [ "$SUBCOMMAND" = "info" ] ; then
    CLASS="org.apache.hadoop.hbase.snapshot.SnapshotInfo"
  elif [ "$SUBCOMMAND" = "export" ] ; then
    CLASS="org.apache.hadoop.hbase.snapshot.ExportSnapshot"
  else
    echo "Usage: hbase [<options>] snapshot <subcommand> [<args>]"
    echo "$options_string"
    echo ""
    echo "Subcommands:"
    echo "  create          Create a new snapshot of a table"
    echo "  info            Tool for dumping snapshot information"
    echo "  export          Export an existing snapshot"
    exit 1
  fi
elif [ "$COMMAND" = "master" ] ; then
  CLASS='org.apache.hadoop.hbase.master.HMaster'
  if [ "$1" != "stop" ] && [ "$1" != "clear" ] ; then
    HBASE_OPTS="$HBASE_OPTS $HBASE_MASTER_OPTS"
  fi
elif [ "$COMMAND" = "regionserver" ] ; then
  CLASS='org.apache.hadoop.hbase.regionserver.HRegionServer'
  if [ "$1" != "stop" ] ; then
    HBASE_OPTS="$HBASE_OPTS $HBASE_REGIONSERVER_OPTS"
  fi
elif [ "$COMMAND" = "thrift" ] ; then
  CLASS='org.apache.hadoop.hbase.thrift.ThriftServer'
  if [ "$1" != "stop" ] ; then
    HBASE_OPTS="$HBASE_OPTS $HBASE_THRIFT_OPTS"
  fi
elif [ "$COMMAND" = "thrift2" ] ; then
  CLASS='org.apache.hadoop.hbase.thrift2.ThriftServer'
  if [ "$1" != "stop" ] ; then
    HBASE_OPTS="$HBASE_OPTS $HBASE_THRIFT_OPTS"
  fi
elif [ "$COMMAND" = "rest" ] ; then
  CLASS='org.apache.hadoop.hbase.rest.RESTServer'
  if [ "$1" != "stop" ] ; then
    HBASE_OPTS="$HBASE_OPTS $HBASE_REST_OPTS"
  fi
elif [ "$COMMAND" = "zookeeper" ] ; then
  CLASS='org.apache.hadoop.hbase.zookeeper.HQuorumPeer'
  if [ "$1" != "stop" ] ; then
    HBASE_OPTS="$HBASE_OPTS $HBASE_ZOOKEEPER_OPTS"
  fi
elif [ "$COMMAND" = "clean" ] ; then
  case $1 in
    --cleanZk|--cleanHdfs|--cleanAll)
      matches="yes" ;;
    *) ;;
  esac
  if [ $# -ne 1 -o "$matches" = "" ]; then
    echo "Usage: hbase clean (--cleanZk|--cleanHdfs|--cleanAll)"
    echo "Options: "
    echo "        --cleanZk   cleans hbase related data from zookeeper."
    echo "        --cleanHdfs cleans hbase related data from hdfs."
    echo "        --cleanAll  cleans hbase related data from both zookeeper and hdfs."
    exit 1;
  fi
  "$bin"/hbase-cleanup.sh --config ${HBASE_CONF_DIR} $@
  exit $?
elif [ "$COMMAND" = "mapredcp" ] ; then
  # If we didn't find a jar above, this will just be blank and the
  # check below will then default back to the internal classpath.
  shaded_jar="${shaded_mapreduce}"
  if [ "${INTERNAL_CLASSPATH}" != "true" ] && [ -f "${shaded_jar}" ]; then
    echo -n "${shaded_jar}"
    for f in "${HBASE_HOME}"/lib/client-facing-thirdparty/*.jar; do
      if [[ ! "${f}" =~ ^.*/htrace-core-3.*\.jar$ ]] && \
         [ "${f}" != "htrace-core.jar$" ] && \
         [[ ! "${f}" =~ ^.*/slf4j-log4j.*$ ]]; then
        echo -n ":${f}"
      fi
    done
    echo ""
    exit 0
  fi
  CLASS='org.apache.hadoop.hbase.util.MapreduceDependencyClasspathTool'
elif [ "$COMMAND" = "classpath" ] ; then
  echo "$CLASSPATH"
  exit 0
elif [ "$COMMAND" = "pe" ] ; then
  CLASS='org.apache.hadoop.hbase.PerformanceEvaluation'
  HBASE_OPTS="$HBASE_OPTS $HBASE_PE_OPTS"
elif [ "$COMMAND" = "ltt" ] ; then
  CLASS='org.apache.hadoop.hbase.util.LoadTestTool'
  HBASE_OPTS="$HBASE_OPTS $HBASE_LTT_OPTS"
elif [ "$COMMAND" = "canary" ] ; then
  CLASS='org.apache.hadoop.hbase.tool.CanaryTool'
  HBASE_OPTS="$HBASE_OPTS $HBASE_CANARY_OPTS"
elif [ "$COMMAND" = "version" ] ; then
  CLASS='org.apache.hadoop.hbase.util.VersionInfo'
elif [ "$COMMAND" = "regionsplitter" ] ; then
  CLASS='org.apache.hadoop.hbase.util.RegionSplitter'
elif [ "$COMMAND" = "rowcounter" ] ; then
  CLASS='org.apache.hadoop.hbase.mapreduce.RowCounter'
elif [ "$COMMAND" = "cellcounter" ] ; then
  CLASS='org.apache.hadoop.hbase.mapreduce.CellCounter'
elif [ "$COMMAND" = "pre-upgrade" ] ; then
  CLASS='org.apache.hadoop.hbase.tool.PreUpgradeValidator'
elif [ "$COMMAND" = "completebulkload" ] ; then
  CLASS='org.apache.hadoop.hbase.tool.BulkLoadHFilesTool'
elif [ "$COMMAND" = "hbtop" ] ; then
  CLASS='org.apache.hadoop.hbase.hbtop.HBTop'
  if [ -n "${shaded_jar}" ] ; then
    for f in "${HBASE_HOME}"/lib/hbase-hbtop*.jar; do
      if [ -f "${f}" ]; then
        CLASSPATH="${CLASSPATH}:${f}"
        break
      fi
    done
    for f in "${HBASE_HOME}"/lib/commons-lang3*.jar; do
      if [ -f "${f}" ]; then
        CLASSPATH="${CLASSPATH}:${f}"
        break
      fi
    done
  fi

  if [ -f "${HBASE_HOME}/conf/log4j-hbtop.properties" ] ; then
    HBASE_HBTOP_OPTS="${HBASE_HBTOP_OPTS} -Dlog4j.configuration=file:${HBASE_HOME}/conf/log4j-hbtop.properties"
  fi
  HBASE_OPTS="${HBASE_OPTS} ${HBASE_HBTOP_OPTS}"
else
  CLASS=$COMMAND
fi

# Add lib/jdk11 jars to the classpath

if [ "${DEBUG}" = "true" ]; then
  echo "Deciding on addition of lib/jdk11 jars to the classpath"
fi

addJDK11Jars=false

if [ "${HBASE_JDK11}" != "" ]; then
  # Use the passed Environment Variable HBASE_JDK11
  if [ "${HBASE_JDK11}" = "include" ]; then
    addJDK11Jars=true
    if [ "${DEBUG}" = "true" ]; then
      echo "HBASE_JDK11 set as 'include' hence adding JDK11 jars to classpath."
    fi
  elif [ "${HBASE_JDK11}" = "exclude" ]; then
    if [ "${DEBUG}" = "true" ]; then
      echo "HBASE_JDK11 set as 'exclude' hence skipping JDK11 jars to classpath."
    fi
  else
    echo "[HBASE_JDK11] contains unsupported value(s) - ${HBASE_JDK11}. Ignoring passed value."
    echo "[HBASE_JDK11] supported values: [include, exclude]."
  fi
else
  # Use JDK detection
  version="$(read_java_version)"
  major_version_number="$(parse_java_major_version "$version")"

  if [ "${DEBUG}" = "true" ]; then
    echo "HBASE_JDK11 not set hence using JDK detection."
    echo "Extracted JDK version - ${version}, major_version_number - ${major_version_number}"
  fi

  if [[ "$major_version_number" -ge "11" ]]; then
    if [ "${DEBUG}" = "true" ]; then
      echo "Version ${version} is greater-than/equal to 11 hence adding JDK11 jars to classpath."
    fi
    addJDK11Jars=true
  elif [ "${DEBUG}" = "true" ]; then
      echo "Version ${version} is lesser than 11 hence skipping JDK11 jars from classpath."
  fi
fi

if [ "${addJDK11Jars}" = "true" ]; then
  add_jdk11_deps_to_classpath
  if [ "${DEBUG}" = "true" ]; then
      echo "Added JDK11 jars to classpath."
    fi
elif [ "${DEBUG}" = "true" ]; then
  echo "JDK11 jars skipped from classpath."
fi

# Have JVM dump heap if we run out of memory.  Files will be 'launch directory'
# and are named like the following: java_pid21612.hprof. Apparently it doesn't
# 'cost' to have this flag enabled. Its a 1.6 flag only. See:
# http://blogs.sun.com/alanb/entry/outofmemoryerror_looks_a_bit_better
HBASE_OPTS="$HBASE_OPTS -Dhbase.log.dir=$HBASE_LOG_DIR"
HBASE_OPTS="$HBASE_OPTS -Dhbase.log.file=$HBASE_LOGFILE"
HBASE_OPTS="$HBASE_OPTS -Dhbase.home.dir=$HBASE_HOME"
HBASE_OPTS="$HBASE_OPTS -Dhbase.id.str=$HBASE_IDENT_STRING"
HBASE_OPTS="$HBASE_OPTS -Dhbase.root.logger=${HBASE_ROOT_LOGGER:-INFO,console}"
if [ "x$JAVA_LIBRARY_PATH" != "x" ]; then
  HBASE_OPTS="$HBASE_OPTS -Djava.library.path=$JAVA_LIBRARY_PATH"
  export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$JAVA_LIBRARY_PATH"
fi

# Enable security logging on the master and regionserver only
if [ "$COMMAND" = "master" ] || [ "$COMMAND" = "regionserver" ]; then
  HBASE_OPTS="$HBASE_OPTS -Dhbase.security.logger=${HBASE_SECURITY_LOGGER:-INFO,RFAS}"
else
  HBASE_OPTS="$HBASE_OPTS -Dhbase.security.logger=${HBASE_SECURITY_LOGGER:-INFO,NullAppender}"
fi

HEAP_SETTINGS="$JAVA_HEAP_MAX $JAVA_OFFHEAP_MAX"
# by now if we're running a command it means we need logging
for f in ${HBASE_HOME}/lib/client-facing-thirdparty/slf4j-log4j*.jar; do
  if [ -f "${f}" ]; then
    CLASSPATH="${CLASSPATH}:${f}"
    break
  fi
done

# Exec unless HBASE_NOEXEC is set.
export CLASSPATH
if [ "${DEBUG}" = "true" ]; then
  echo "classpath=${CLASSPATH}" >&2
  HBASE_OPTS="${HBASE_OPTS} -Xdiag"
fi

if [ "${HBASE_NOEXEC}" != "" ]; then
  "$JAVA" -Dproc_$COMMAND -XX:OnOutOfMemoryError="kill -9 %p" $HEAP_SETTINGS $HBASE_OPTS $CLASS "$@"
else
  export JVM_PID="$$"
  exec "$JAVA" -Dproc_$COMMAND -XX:OnOutOfMemoryError="kill -9 %p" $HEAP_SETTINGS $HBASE_OPTS $CLASS "$@"
fi