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| <div id="overview"><a href="../../../../../apidocs/org/trafodion/dcs/master/MasterLeaderElection.html">View Javadoc</a></div><pre> |
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| <a class="jxr_linenumber" name="1" href="#1">1</a> <em class="jxr_javadoccomment">/**</em>
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| <a class="jxr_linenumber" name="2" href="#2">2</a> <em class="jxr_javadoccomment">* @@@ START COPYRIGHT @@@</em>
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| <a class="jxr_linenumber" name="3" href="#3">3</a>
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| <a class="jxr_linenumber" name="4" href="#4">4</a> <em class="jxr_javadoccomment">Licensed to the Apache Software Foundation (ASF) under one</em>
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| <a class="jxr_linenumber" name="5" href="#5">5</a> <em class="jxr_javadoccomment">or more contributor license agreements. See the NOTICE file</em>
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| <a class="jxr_linenumber" name="6" href="#6">6</a> <em class="jxr_javadoccomment">distributed with this work for additional information</em>
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| <a class="jxr_linenumber" name="7" href="#7">7</a> <em class="jxr_javadoccomment">regarding copyright ownership. The ASF licenses this file</em>
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| <a class="jxr_linenumber" name="8" href="#8">8</a> <em class="jxr_javadoccomment">to you under the Apache License, Version 2.0 (the</em>
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| <a class="jxr_linenumber" name="9" href="#9">9</a> <em class="jxr_javadoccomment">"License"); you may not use this file except in compliance</em>
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| <a class="jxr_linenumber" name="10" href="#10">10</a> <em class="jxr_javadoccomment">with the License. You may obtain a copy of the License at</em>
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| <a class="jxr_linenumber" name="11" href="#11">11</a>
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| <a class="jxr_linenumber" name="12" href="#12">12</a> <em class="jxr_javadoccomment"> <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
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| <a class="jxr_linenumber" name="13" href="#13">13</a>
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| <a class="jxr_linenumber" name="14" href="#14">14</a> <em class="jxr_javadoccomment">Unless required by applicable law or agreed to in writing,</em>
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| <a class="jxr_linenumber" name="15" href="#15">15</a> <em class="jxr_javadoccomment">software distributed under the License is distributed on an</em>
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| <a class="jxr_linenumber" name="16" href="#16">16</a> <em class="jxr_javadoccomment">"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em>
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| <a class="jxr_linenumber" name="17" href="#17">17</a> <em class="jxr_javadoccomment">KIND, either express or implied. See the License for the</em>
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| <a class="jxr_linenumber" name="18" href="#18">18</a> <em class="jxr_javadoccomment">specific language governing permissions and limitations</em>
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| <a class="jxr_linenumber" name="19" href="#19">19</a> <em class="jxr_javadoccomment">under the License.</em>
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| <a class="jxr_linenumber" name="20" href="#20">20</a>
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| <a class="jxr_linenumber" name="21" href="#21">21</a> <em class="jxr_javadoccomment">* @@@ END COPYRIGHT @@@</em>
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| <a class="jxr_linenumber" name="22" href="#22">22</a> <em class="jxr_javadoccomment"> */</em>
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| <a class="jxr_linenumber" name="23" href="#23">23</a> <em class="jxr_javadoccomment">/**</em>
|
| <a class="jxr_linenumber" name="24" href="#24">24</a> <em class="jxr_javadoccomment"> * Copyright 2007 The Apache Software Foundation</em>
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| <a class="jxr_linenumber" name="25" href="#25">25</a> <em class="jxr_javadoccomment"> *</em>
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| <a class="jxr_linenumber" name="26" href="#26">26</a> <em class="jxr_javadoccomment"> * Licensed to the Apache Software Foundation (ASF) under one</em>
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| <a class="jxr_linenumber" name="27" href="#27">27</a> <em class="jxr_javadoccomment"> * or more contributor license agreements. See the NOTICE file</em>
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| <a class="jxr_linenumber" name="28" href="#28">28</a> <em class="jxr_javadoccomment"> * distributed with this work for additional information</em>
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| <a class="jxr_linenumber" name="29" href="#29">29</a> <em class="jxr_javadoccomment"> * regarding copyright ownership. The ASF licenses this file</em>
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| <a class="jxr_linenumber" name="30" href="#30">30</a> <em class="jxr_javadoccomment"> * to you under the Apache License, Version 2.0 (the</em>
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| <a class="jxr_linenumber" name="31" href="#31">31</a> <em class="jxr_javadoccomment"> * "License"); you may not use this file except in compliance</em>
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| <a class="jxr_linenumber" name="32" href="#32">32</a> <em class="jxr_javadoccomment"> * with the License. You may obtain a copy of the License at</em>
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| <a class="jxr_linenumber" name="33" href="#33">33</a> <em class="jxr_javadoccomment"> *</em>
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| <a class="jxr_linenumber" name="34" href="#34">34</a> <em class="jxr_javadoccomment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
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| <a class="jxr_linenumber" name="35" href="#35">35</a> <em class="jxr_javadoccomment"> *</em>
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| <a class="jxr_linenumber" name="36" href="#36">36</a> <em class="jxr_javadoccomment"> * Unless required by applicable law or agreed to in writing, software</em>
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| <a class="jxr_linenumber" name="37" href="#37">37</a> <em class="jxr_javadoccomment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
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| <a class="jxr_linenumber" name="38" href="#38">38</a> <em class="jxr_javadoccomment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
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| <a class="jxr_linenumber" name="39" href="#39">39</a> <em class="jxr_javadoccomment"> * See the License for the specific language governing permissions and</em>
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| <a class="jxr_linenumber" name="40" href="#40">40</a> <em class="jxr_javadoccomment"> * limitations under the License.</em>
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| <a class="jxr_linenumber" name="41" href="#41">41</a> <em class="jxr_javadoccomment"> */</em>
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| <a class="jxr_linenumber" name="42" href="#42">42</a>
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| <a class="jxr_linenumber" name="43" href="#43">43</a> <strong class="jxr_keyword">package</strong> org.trafodion.dcs.master;
|
| <a class="jxr_linenumber" name="44" href="#44">44</a>
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| <a class="jxr_linenumber" name="45" href="#45">45</a> <strong class="jxr_keyword">import</strong> org.apache.zookeeper.*;
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| <a class="jxr_linenumber" name="46" href="#46">46</a> <strong class="jxr_keyword">import</strong> org.apache.zookeeper.data.Stat;
|
| <a class="jxr_linenumber" name="47" href="#47">47</a>
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| <a class="jxr_linenumber" name="48" href="#48">48</a> <strong class="jxr_keyword">import</strong> java.io.IOException;
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| <a class="jxr_linenumber" name="49" href="#49">49</a> <strong class="jxr_keyword">import</strong> java.util.Collections;
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| <a class="jxr_linenumber" name="50" href="#50">50</a> <strong class="jxr_keyword">import</strong> java.util.List;
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| <a class="jxr_linenumber" name="51" href="#51">51</a>
|
| <a class="jxr_linenumber" name="52" href="#52">52</a> <strong class="jxr_keyword">import</strong> org.apache.commons.logging.Log;
|
| <a class="jxr_linenumber" name="53" href="#53">53</a> <strong class="jxr_keyword">import</strong> org.apache.commons.logging.LogFactory;
|
| <a class="jxr_linenumber" name="54" href="#54">54</a>
|
| <a class="jxr_linenumber" name="55" href="#55">55</a> <strong class="jxr_keyword">import</strong> org.trafodion.dcs.Constants;
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| <a class="jxr_linenumber" name="56" href="#56">56</a> <strong class="jxr_keyword">import</strong> org.trafodion.dcs.util.*;
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| <a class="jxr_linenumber" name="57" href="#57">57</a>
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| <a class="jxr_linenumber" name="58" href="#58">58</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/trafodion/dcs/master/MasterLeaderElection.html">MasterLeaderElection</a> {
|
| <a class="jxr_linenumber" name="59" href="#59">59</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Log LOG = LogFactory
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| <a class="jxr_linenumber" name="60" href="#60">60</a> .getLog(MasterLeaderElection.<strong class="jxr_keyword">class</strong>);
|
| <a class="jxr_linenumber" name="61" href="#61">61</a> <strong class="jxr_keyword">private</strong> <a href="../../../../org/trafodion/dcs/master/DcsMaster.html">DcsMaster</a> master = <strong class="jxr_keyword">null</strong>;
|
| <a class="jxr_linenumber" name="62" href="#62">62</a> <strong class="jxr_keyword">private</strong> String myZnode;
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| <a class="jxr_linenumber" name="63" href="#63">63</a> <strong class="jxr_keyword">private</strong> String parentZnode;
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| <a class="jxr_linenumber" name="64" href="#64">64</a> <strong class="jxr_keyword">private</strong> String leaderZnode;
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| <a class="jxr_linenumber" name="65" href="#65">65</a> <strong class="jxr_keyword">private</strong> <a href="../../../../org/trafodion/dcs/master/FloatingIp.html">FloatingIp</a> floatingIp;
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| <a class="jxr_linenumber" name="66" href="#66">66</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> isLeader = false;
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| <a class="jxr_linenumber" name="67" href="#67">67</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> isFollower = false;
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| <a class="jxr_linenumber" name="68" href="#68">68</a>
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| <a class="jxr_linenumber" name="69" href="#69">69</a> <strong class="jxr_keyword">public</strong> <a href="../../../../org/trafodion/dcs/master/MasterLeaderElection.html">MasterLeaderElection</a>(<a href="../../../../org/trafodion/dcs/master/DcsMaster.html">DcsMaster</a> master) <strong class="jxr_keyword">throws</strong> IOException,
|
| <a class="jxr_linenumber" name="70" href="#70">70</a> InterruptedException, KeeperException {
|
| <a class="jxr_linenumber" name="71" href="#71">71</a> <strong class="jxr_keyword">this</strong>.master = master;
|
| <a class="jxr_linenumber" name="72" href="#72">72</a> <strong class="jxr_keyword">this</strong>.parentZnode = master.getZKParentZnode();
|
| <a class="jxr_linenumber" name="73" href="#73">73</a>
|
| <a class="jxr_linenumber" name="74" href="#74">74</a> <strong class="jxr_keyword">try</strong> {
|
| <a class="jxr_linenumber" name="75" href="#75">75</a> <strong class="jxr_keyword">this</strong>.floatingIp = FloatingIp.getInstance(master);
|
| <a class="jxr_linenumber" name="76" href="#76">76</a> } <strong class="jxr_keyword">catch</strong> (Exception e) {
|
| <a class="jxr_linenumber" name="77" href="#77">77</a> <strong class="jxr_keyword">if</strong> (LOG.isErrorEnabled()) {
|
| <a class="jxr_linenumber" name="78" href="#78">78</a> LOG.error(<span class="jxr_string">"Error creating class FloatingIp ["</span> + e.getMessage() + <span class="jxr_string">"]"</span>);
|
| <a class="jxr_linenumber" name="79" href="#79">79</a> }
|
| <a class="jxr_linenumber" name="80" href="#80">80</a> floatingIp = <strong class="jxr_keyword">null</strong>;
|
| <a class="jxr_linenumber" name="81" href="#81">81</a> }
|
| <a class="jxr_linenumber" name="82" href="#82">82</a>
|
| <a class="jxr_linenumber" name="83" href="#83">83</a> byte[] data = Bytes.toBytes(master.getServerName() + <span class="jxr_string">":"</span>
|
| <a class="jxr_linenumber" name="84" href="#84">84</a> + master.getInstance() + <span class="jxr_string">":"</span>);
|
| <a class="jxr_linenumber" name="85" href="#85">85</a> setNodePath(master.getZkClient().create(
|
| <a class="jxr_linenumber" name="86" href="#86">86</a> parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_MASTER_LEADER
|
| <a class="jxr_linenumber" name="87" href="#87">87</a> + <span class="jxr_string">"/"</span> + <span class="jxr_string">"leader-n_"</span>, data, ZooDefs.Ids.OPEN_ACL_UNSAFE,
|
| <a class="jxr_linenumber" name="88" href="#88">88</a> CreateMode.EPHEMERAL_SEQUENTIAL));
|
| <a class="jxr_linenumber" name="89" href="#89">89</a> elect();
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| <a class="jxr_linenumber" name="90" href="#90">90</a> }
|
| <a class="jxr_linenumber" name="91" href="#91">91</a>
|
| <a class="jxr_linenumber" name="92" href="#92">92</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> setNodePath(String myZnode) {
|
| <a class="jxr_linenumber" name="93" href="#93">93</a> <strong class="jxr_keyword">this</strong>.myZnode = myZnode;
|
| <a class="jxr_linenumber" name="94" href="#94">94</a> }
|
| <a class="jxr_linenumber" name="95" href="#95">95</a>
|
| <a class="jxr_linenumber" name="96" href="#96">96</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">synchronized</strong> <strong class="jxr_keyword">void</strong> elect() <strong class="jxr_keyword">throws</strong> IOException, InterruptedException,
|
| <a class="jxr_linenumber" name="97" href="#97">97</a> KeeperException {
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| <a class="jxr_linenumber" name="98" href="#98">98</a>
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| <a class="jxr_linenumber" name="99" href="#99">99</a> <em class="jxr_comment">// If I'm the leader ignore further znode events</em>
|
| <a class="jxr_linenumber" name="100" href="#100">100</a> <strong class="jxr_keyword">if</strong> (isLeader)
|
| <a class="jxr_linenumber" name="101" href="#101">101</a> <strong class="jxr_keyword">return</strong>;
|
| <a class="jxr_linenumber" name="102" href="#102">102</a>
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| <a class="jxr_linenumber" name="103" href="#103">103</a> List<String> znodeList = master.getZkClient().getChildren(
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| <a class="jxr_linenumber" name="104" href="#104">104</a> parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_MASTER_LEADER,
|
| <a class="jxr_linenumber" name="105" href="#105">105</a> <strong class="jxr_keyword">new</strong> <a href="../../../../org/trafodion/dcs/master/MasterLeaderElection.html">ElectionNodeWatcher</a>());
|
| <a class="jxr_linenumber" name="106" href="#106">106</a>
|
| <a class="jxr_linenumber" name="107" href="#107">107</a> Collections.sort(znodeList);
|
| <a class="jxr_linenumber" name="108" href="#108">108</a> leaderZnode = parentZnode
|
| <a class="jxr_linenumber" name="109" href="#109">109</a> + Constants.DEFAULT_ZOOKEEPER_ZNODE_MASTER_LEADER + <span class="jxr_string">"/"</span>
|
| <a class="jxr_linenumber" name="110" href="#110">110</a> + znodeList.get(0);
|
| <a class="jxr_linenumber" name="111" href="#111">111</a>
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| <a class="jxr_linenumber" name="112" href="#112">112</a> <strong class="jxr_keyword">if</strong> (myZnode.equals(leaderZnode))
|
| <a class="jxr_linenumber" name="113" href="#113">113</a> isLeader = <strong class="jxr_keyword">true</strong>;
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| <a class="jxr_linenumber" name="114" href="#114">114</a> <strong class="jxr_keyword">else</strong>
|
| <a class="jxr_linenumber" name="115" href="#115">115</a> isLeader = false;
|
| <a class="jxr_linenumber" name="116" href="#116">116</a>
|
| <a class="jxr_linenumber" name="117" href="#117">117</a> <strong class="jxr_keyword">if</strong>(LOG.isDebugEnabled())
|
| <a class="jxr_linenumber" name="118" href="#118">118</a> LOG.debug(<span class="jxr_string">"leaderZnode="</span> + leaderZnode + <span class="jxr_string">", myZnode="</span> + myZnode + <span class="jxr_string">",isLeader="</span> + isLeader);
|
| <a class="jxr_linenumber" name="119" href="#119">119</a>
|
| <a class="jxr_linenumber" name="120" href="#120">120</a> <strong class="jxr_keyword">if</strong> (isLeader) {
|
| <a class="jxr_linenumber" name="121" href="#121">121</a> LOG.info(<span class="jxr_string">"I'm the Leader ["</span> + myZnode + <span class="jxr_string">"]"</span>);
|
| <a class="jxr_linenumber" name="122" href="#122">122</a> <strong class="jxr_keyword">if</strong> (floatingIp != <strong class="jxr_keyword">null</strong>) {
|
| <a class="jxr_linenumber" name="123" href="#123">123</a> <strong class="jxr_keyword">try</strong> {
|
| <a class="jxr_linenumber" name="124" href="#124">124</a> floatingIp.runScript();
|
| <a class="jxr_linenumber" name="125" href="#125">125</a> } <strong class="jxr_keyword">catch</strong> (Exception e) {
|
| <a class="jxr_linenumber" name="126" href="#126">126</a> <strong class="jxr_keyword">if</strong> (LOG.isErrorEnabled()) {
|
| <a class="jxr_linenumber" name="127" href="#127">127</a> LOG.error(<span class="jxr_string">"Error invoking FloatingIp ["</span> + e.getMessage() + <span class="jxr_string">"]"</span>);
|
| <a class="jxr_linenumber" name="128" href="#128">128</a> }
|
| <a class="jxr_linenumber" name="129" href="#129">129</a> }
|
| <a class="jxr_linenumber" name="130" href="#130">130</a> }
|
| <a class="jxr_linenumber" name="131" href="#131">131</a> master.setIsLeader();
|
| <a class="jxr_linenumber" name="132" href="#132">132</a> } <strong class="jxr_keyword">else</strong> {
|
| <a class="jxr_linenumber" name="133" href="#133">133</a> LOG.info(<span class="jxr_string">"I'm a follower ["</span> + myZnode + <span class="jxr_string">"]"</span>);
|
| <a class="jxr_linenumber" name="134" href="#134">134</a> isFollower = <strong class="jxr_keyword">true</strong>;<em class="jxr_comment">// See ServerManager.getZkRunning()</em>
|
| <a class="jxr_linenumber" name="135" href="#135">135</a> }
|
| <a class="jxr_linenumber" name="136" href="#136">136</a> }
|
| <a class="jxr_linenumber" name="137" href="#137">137</a>
|
| <a class="jxr_linenumber" name="138" href="#138">138</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/trafodion/dcs/master/MasterLeaderElection.html">ElectionNodeWatcher</a> <strong class="jxr_keyword">implements</strong> Watcher {
|
| <a class="jxr_linenumber" name="139" href="#139">139</a> <em class="jxr_comment">// watches /LEADER node's children changes.</em>
|
| <a class="jxr_linenumber" name="140" href="#140">140</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> process(WatchedEvent event) {
|
| <a class="jxr_linenumber" name="141" href="#141">141</a> <strong class="jxr_keyword">if</strong> (event.getType() == Event.EventType.NodeChildrenChanged) {
|
| <a class="jxr_linenumber" name="142" href="#142">142</a> LOG.info(<span class="jxr_string">"Node changed ["</span> + event.getPath()
|
| <a class="jxr_linenumber" name="143" href="#143">143</a> + <span class="jxr_string">"], electing a leader."</span>);
|
| <a class="jxr_linenumber" name="144" href="#144">144</a> <strong class="jxr_keyword">try</strong> {
|
| <a class="jxr_linenumber" name="145" href="#145">145</a> elect();
|
| <a class="jxr_linenumber" name="146" href="#146">146</a> } <strong class="jxr_keyword">catch</strong> (IOException e) {
|
| <a class="jxr_linenumber" name="147" href="#147">147</a> LOG.error(e);
|
| <a class="jxr_linenumber" name="148" href="#148">148</a> } <strong class="jxr_keyword">catch</strong> (InterruptedException e) {
|
| <a class="jxr_linenumber" name="149" href="#149">149</a> LOG.error(e);
|
| <a class="jxr_linenumber" name="150" href="#150">150</a> } <strong class="jxr_keyword">catch</strong> (KeeperException e) {
|
| <a class="jxr_linenumber" name="151" href="#151">151</a> LOG.error(e);
|
| <a class="jxr_linenumber" name="152" href="#152">152</a> }
|
| <a class="jxr_linenumber" name="153" href="#153">153</a> }
|
| <a class="jxr_linenumber" name="154" href="#154">154</a> }
|
| <a class="jxr_linenumber" name="155" href="#155">155</a> }
|
| <a class="jxr_linenumber" name="156" href="#156">156</a>
|
| <a class="jxr_linenumber" name="157" href="#157">157</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isFollower() {
|
| <a class="jxr_linenumber" name="158" href="#158">158</a> <strong class="jxr_keyword">return</strong> isFollower;
|
| <a class="jxr_linenumber" name="159" href="#159">159</a> }
|
| <a class="jxr_linenumber" name="160" href="#160">160</a>
|
| <a class="jxr_linenumber" name="161" href="#161">161</a> }
|
| </pre> |
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