svn commit: r1576856 - /hbase/trunk/bin/draining_servers.rb

[en...@apache.org]

Author: enis
Date: Wed Mar 12 19:00:47 2014
New Revision: 1576856

URL: http://svn.apache.org/r1576856
Log:
HBASE-10688 Add a draining_node script to manage nodes in draining mode

Added:
    hbase/trunk/bin/draining_servers.rb

Added: hbase/trunk/bin/draining_servers.rb
URL: http://svn.apache.org/viewvc/hbase/trunk/bin/draining_servers.rb?rev=1576856&view=auto
==============================================================================
--- hbase/trunk/bin/draining_servers.rb (added)
+++ hbase/trunk/bin/draining_servers.rb Wed Mar 12 19:00:47 2014
@@ -0,0 +1,164 @@
+#
+# 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