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#
# 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.
#
# Add or remove servers from draining mode via zookeeper
# Deprecated in 2.0, and will be removed in 3.0. Use Admin decommission
# API instead.
require 'optparse'
include Java
java_import org.apache.hadoop.hbase.HBaseConfiguration
java_import org.apache.hadoop.hbase.client.ConnectionFactory
java_import org.apache.hadoop.hbase.client.HBaseAdmin
java_import org.apache.hadoop.hbase.zookeeper.ZKUtil
java_import org.apache.hadoop.hbase.zookeeper.ZNodePaths
java_import org.slf4j.LoggerFactory
# Name of this script
NAME = 'draining_servers'.freeze
# Do command-line parsing
options = {}
optparse = OptionParser.new do |opts|
opts.banner = "Usage: ./hbase org.jruby.Main #{NAME}.rb [options] add|remove|list <hostname>|<host:port>|<servername> ..."
opts.separator 'Add remove or list servers in draining mode. Can accept either hostname to drain all region servers' \
'in that host, a host:port pair or a host,port,startCode triplet. More than one server can be given separated by space'
opts.on('-h', '--help', 'Display usage information') do
puts opts
exit
end
end
optparse.parse!
# Return array of servernames where servername is hostname+port+startcode
# comma-delimited
def getServers(admin)
serverInfos = admin.getClusterStatus.getServers
servers = []
for server in serverInfos
servers << server.getServerName
end
servers
end
def getServerNames(hostOrServers, config)
ret = []
connection = ConnectionFactory.createConnection(config)
for hostOrServer in hostOrServers
# check whether it is already serverName. No need to connect to cluster
parts = hostOrServer.split(',')
if parts.size == 3
ret << hostOrServer
else
admin = connection.getAdmin unless admin
servers = getServers(admin)
hostOrServer = hostOrServer.tr(':', ',')
for server in servers
ret << server if server.start_with?(hostOrServer)
end
end
end
admin.close if admin
connection.close
ret
end
def addServers(_options, hostOrServers)
config = HBaseConfiguration.create
servers = getServerNames(hostOrServers, config)
zkw = org.apache.hadoop.hbase.zookeeper.ZKWatcher.new(config, 'draining_servers', nil)
begin
parentZnode = zkw.getZNodePaths.drainingZNode
for server in servers
node = ZNodePaths.joinZNode(parentZnode, server)
ZKUtil.createAndFailSilent(zkw, node)
end
ensure
zkw.close
end
end
def removeServers(_options, hostOrServers)
config = HBaseConfiguration.create
servers = getServerNames(hostOrServers, config)
zkw = org.apache.hadoop.hbase.zookeeper.ZKWatcher.new(config, 'draining_servers', nil)
begin
parentZnode = zkw.getZNodePaths.drainingZNode
for server in servers
node = ZNodePaths.joinZNode(parentZnode, server)
ZKUtil.deleteNodeFailSilent(zkw, node)
end
ensure
zkw.close
end
end
# list servers in draining mode
def listServers(_options)
config = HBaseConfiguration.create
zkw = org.apache.hadoop.hbase.zookeeper.ZKWatcher.new(config, 'draining_servers', nil)
begin
parentZnode = zkw.getZNodePaths.drainingZNode
servers = ZKUtil.listChildrenNoWatch(zkw, parentZnode)
servers.each { |server| puts server }
ensure
zkw.close
end
end
hostOrServers = ARGV[1..ARGV.size]
# Create a logger and save it to ruby global
$LOG = LoggerFactory.getLogger(NAME)
case ARGV[0]
when 'add'
if ARGV.length < 2
puts optparse
exit 1
end
addServers(options, hostOrServers)
when 'remove'
if ARGV.length < 2
puts optparse
exit 1
end
removeServers(options, hostOrServers)
when 'list'
listServers(options)
else
puts optparse
exit 3
end
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