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draining_servers.rb
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draining_servers.rb
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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
require 'optparse'
include Java
import org.apache.hadoop.hbase.HBaseConfiguration
import org.apache.hadoop.hbase.client.HBaseAdmin
import org.apache.hadoop.hbase.zookeeper.ZKUtil
import org.apache.commons.logging.Log
import org.apache.commons.logging.LogFactory
# Name of this script
NAME = "draining_servers"
# 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
options[:debug] = false
opts.on('-d', '--debug', 'Display extra debug logging') do
options[:debug] = true
end
end
optparse.parse!
# Return array of servernames where servername is hostname+port+startcode
# comma-delimited
def getServers(admin)
serverInfos = admin.getClusterStatus().getServerInfo()
servers = []
for server in serverInfos
servers << server.getServerName()
end
return servers
end
def getServerNames(hostOrServers, config)
ret = []
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 = HBaseAdmin.new(config) if not admin
servers = getServers(admin)
hostOrServer = hostOrServer.gsub(/:/, ",")
for server in servers
ret << server if server.start_with?(hostOrServer)
end
end
end
admin.close() if admin
return ret
end
def addServers(options, hostOrServers)
config = HBaseConfiguration.create()
servers = getServerNames(hostOrServers, config)
zkw = org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.new(config, "draining_servers", nil)
parentZnode = zkw.drainingZNode
begin
for server in servers
node = ZKUtil.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.ZooKeeperWatcher.new(config, "draining_servers", nil)
parentZnode = zkw.drainingZNode
begin
for server in servers
node = ZKUtil.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.ZooKeeperWatcher.new(config, "draining_servers", nil)
parentZnode = zkw.drainingZNode
servers = ZKUtil.listChildrenNoWatch(zkw, parentZnode)
servers.each {|server| puts server}
end
hostOrServers = ARGV[1..ARGV.size()]
# Create a logger and disable the DEBUG-level annoying client logging
def configureLogging(options)
apacheLogger = LogFactory.getLog(NAME)
# Configure log4j to not spew so much
unless (options[:debug])
logger = org.apache.log4j.Logger.getLogger("org.apache.hadoop.hbase")
logger.setLevel(org.apache.log4j.Level::WARN)
logger = org.apache.log4j.Logger.getLogger("org.apache.zookeeper")
logger.setLevel(org.apache.log4j.Level::WARN)
end
return apacheLogger
end
# Create a logger and save it to ruby global
$LOG = configureLogging(options)
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