hbase-cleanup.sh

#!/usr/bin/env bash
#  没有进行批注
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#
# cleans hbase related data from zookeeper and hdfs if no hbase process is alive.--------------------------------------
#
# Environment Variables
#
#   HBASE_REGIONSERVERS    File naming remote hosts.
#     Default is ${HADOOP_CONF_DIR}/regionservers
#   HADOOP_CONF_DIR  Alternate conf dir. Default is ${HADOOP_HOME}/conf.
#   HBASE_CONF_DIR  Alternate hbase conf dir. Default is ${HBASE_HOME}/conf.
#   HADOOP_SLAVE_SLEEP Seconds to sleep between spawning remote commands.
#   HADOOP_SLAVE_TIMEOUT Seconds to wait for timing out a remote command.
#   HADOOP_SSH_OPTS Options passed to ssh when running remote commands.
#


usage="Usage: hbase-cleanup.sh (zk|hdfs|all)"


bin=`dirname "$0"`
bin=`cd "$bin">/dev/null; pwd`


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


case $1 in
  --cleanZk|--cleanHdfs|--cleanAll) 
    matches="yes" ;;
  *) ;;
esac
if [ $# -ne 1 -o "$matches" = "" ]; then
  echo $usage
  exit 1;
fi


format_option=$1;


distMode=`$bin/hbase --config ${HBASE_CONF_DIR} org.apache.hadoop.hbase.util.HBaseConfTool hbase.cluster.distributed | head -n 1`


if [ "$distMode" == 'false' ];then
  echo "Skipping hbase data clearing in standalone mode." 2>&1
  exit 1;
fi


zparent=`$bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool zookeeper.znode.parent`
if [ "$zparent" == "null" ]; then zparent="/hbase"; fi


hrootdir=`$bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool hbase.rootdir`
if [ "$hrootdir" == "null" ]; then hrootdir="file:///tmp/hbase-${USER}/hbase"; fi


check_for_znodes() {
  command=$1;
  case $command in
    regionservers)
      zchild=`$bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool zookeeper.znode.rs`
      if [ "$zchild" == "null" ]; then zchild="rs"; fi
      ;;
    backupmasters)
      zchild=`$bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool zookeeper.znode.backup.masters`
      if [ "$zchild" == "null" ]; then zchild="backup-masters"; fi
      ;;
  esac
  znodes=`"$bin"/hbase zkcli ls $zparent/$zchild 2>&1 | tail -1 | sed "s/\[//" | sed "s/\]//"`
  if [ "$znodes" != "" ]; then
    echo -n "ZNode(s) [${znodes}] of $command are not expired. Exiting without cleaning hbase data."
    echo #force a newline
    exit 1;
  else
    echo -n "All ZNode(s) of $command are expired."
  fi
  echo #force a newline
}


execute_zk_command() {
  command=$1;
  "$bin"/hbase zkcli $command 2>&1
}


execute_hdfs_command() {
  command=$1;
  "$bin"/hbase org.apache.hadoop.fs.FsShell $command 2>&1
}


clean_up() {
  case $1 in
  --cleanZk) 
    execute_zk_command "rmr ${zparent}";
    ;;
  --cleanHdfs)
    execute_hdfs_command "-rmr ${hrootdir}"
    ;;
  --cleanAll)
    execute_zk_command "rmr ${zparent}";
    execute_hdfs_command "-rmr ${hrootdir}"
    ;;
  *)
    ;;
  esac
}


check_znode_exists() {
  command=$1
  "$bin"/hbase zkcli stat $command 2>&1 | grep "Node does not exist\|Connection refused"
}


check_znode_exists $zparent
if [ $? -ne 0 ]; then
  # make sure the online region server(s) znode(s) have been deleted before continuing
  check_for_znodes regionservers
  # make sure the backup master(s) znode(s) has been deleted before continuing
  check_for_znodes backupmasters
  # make sure the master znode has been deleted before continuing
  zmaster=`$bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool zookeeper.znode.master`
  if [ "$zmaster" == "null" ]; then zmaster="master"; fi
    zmaster=$zparent/$zmaster
    check_znode_exists $zmaster
  if [ $? -ne 0 ]; then
    echo -n "Master ZNode is not expired. Exiting without cleaning hbase data."
    echo #force a new line
    exit 1
  else
    echo "Active Master ZNode also expired."
  fi
  echo #force a newline
else
  echo "HBase parent znode ${zparent} does not exist."
fi


# cleans zookeeper and/or hdfs data.
clean_up $format_option