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From an...@apache.org
Subject [11/16] zookeeper git commit: ZOOKEEPER-3155: Remove Forrest XMLs and their build process from the …
Date Tue, 06 Nov 2018 17:50:30 GMT
http://git-wip-us.apache.org/repos/asf/zookeeper/blob/e5fc1228/docs/zookeeperHierarchicalQuorums.html
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-        PDF</a>
-</div>
-<h1>Introduction to hierarchical quorums</h1>
-<div id="front-matter"></div>
-  
-
-  
-
-    
-<p>
-    This document gives an example of how to use hierarchical quorums. The basic idea is
-    very simple. First, we split servers into groups, and add a line for each group listing
-    the servers that form this group. Next we have to assign a weight to each server.  
-    </p>
-    
-    
-<p>
-    The following example shows how to configure a system with three groups of three servers
-    each, and we assign a weight of 1 to each server:
-    </p>
-    
-    
-<pre class="code">
-    group.1=1:2:3
-    group.2=4:5:6
-    group.3=7:8:9
-   
-    weight.1=1
-    weight.2=1
-    weight.3=1
-    weight.4=1
-    weight.5=1
-    weight.6=1
-    weight.7=1
-    weight.8=1
-    weight.9=1
- 	</pre>
-
-	
-<p>    
-    When running the system, we are able to form a quorum once we have a majority of votes from
-    a majority of non-zero-weight groups. Groups that have zero weight are discarded and not
-    considered when forming quorums. Looking at the example, we are able to form a quorum once
-    we have votes from at least two servers from each of two different groups.
-    </p> 
- 
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http://git-wip-us.apache.org/repos/asf/zookeeper/blob/e5fc1228/docs/zookeeperHierarchicalQuorums.pdf
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http://git-wip-us.apache.org/repos/asf/zookeeper/blob/e5fc1228/docs/zookeeperInternals.html
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-<div id="front-matter">
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-<a href="#ch_Introduction">Introduction</a>
-</li>
-<li>
-<a href="#sc_atomicBroadcast">Atomic Broadcast</a>
-<ul class="minitoc">
-<li>
-<a href="#sc_guaranteesPropertiesDefinitions">Guarantees, Properties, and Definitions</a>
-</li>
-<li>
-<a href="#sc_leaderElection">Leader Activation</a>
-</li>
-<li>
-<a href="#sc_activeMessaging">Active Messaging</a>
-</li>
-<li>
-<a href="#sc_summary">Summary</a>
-</li>
-<li>
-<a href="#sc_comparisons">Comparisons</a>
-</li>
-</ul>
-</li>
-<li>
-<a href="#sc_quorum">Quorums</a>
-</li>
-<li>
-<a href="#sc_logging">Logging</a>
-<ul class="minitoc">
-<li>
-<a href="#sc_developerGuidelines">Developer Guidelines</a>
-<ul class="minitoc">
-<li>
-<a href="#sc_rightLevel">Logging at the Right Level</a>
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-<li>
-<a href="#sc_slf4jIdioms">Use of Standard slf4j Idioms</a>
-</li>
-</ul>
-</li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-  
-
-  
-
-  
-<a name="ch_Introduction"></a>
-<h2 class="h3">Introduction</h2>
-<div class="section">
-<p>This document contains information on the inner workings of ZooKeeper. 
-    So far, it discusses these topics:
-    </p>
-<ul>    
-
-<li>
-<p>
-<a href="#sc_atomicBroadcast">Atomic Broadcast</a>
-</p>
-</li>
-
-<li>
-<p>
-<a href="#sc_logging">Logging</a>
-</p>
-</li>
-
-</ul>
-</div>
-
-
-<a name="sc_atomicBroadcast"></a>
-<h2 class="h3">Atomic Broadcast</h2>
-<div class="section">
-<p>
-At the heart of ZooKeeper is an atomic messaging system that keeps all of the servers in sync.</p>
-<a name="sc_guaranteesPropertiesDefinitions"></a>
-<h3 class="h4">Guarantees, Properties, and Definitions</h3>
-<p>
-The specific guarantees provided by the messaging system used by ZooKeeper are the following:</p>
-<dl>
-
-
-<dt>
-<term>
-<em>Reliable delivery</em>
-</term>
-</dt>
-<dd>
-<p>If a message, m, is delivered 
-by one server, it will be eventually delivered by all servers.</p>
-</dd>
-
-
-<dt>
-<term>
-<em>Total order</em>
-</term>
-</dt>
-<dd>
-<p> If a message is 
-delivered before message b by one server, a will be delivered before b by all 
-servers. If a and b are delivered messages, either a will be delivered before b 
-or b will be delivered before a.</p>
-</dd>
-
-
-<dt>
-<term>
-<em>Causal order</em> 
-</term>
-</dt>
-<dd>
-<p>
-If a message b is sent after a message a has been delivered by the sender of b, 
-a must be ordered before b. If a sender sends c after sending b, c must be ordered after b.
-</p>
-</dd>
-
-
-</dl>
-<p>
-The ZooKeeper messaging system also needs to be efficient, reliable, and easy to 
-implement and maintain. We make heavy use of messaging, so we need the system to 
-be able to handle thousands of requests per second. Although we can require at 
-least k+1 correct servers to send new messages, we must be able to recover from 
-correlated failures such as power outages. When we implemented the system we had 
-little time and few engineering resources, so we needed a protocol that is 
-accessible to engineers and is easy to implement. We found that our protocol 
-satisfied all of these goals.
-
-</p>
-<p>
-Our protocol assumes that we can construct point-to-point FIFO channels between 
-the servers. While similar services usually assume message delivery that can 
-lose or reorder messages, our assumption of FIFO channels is very practical 
-given that we use TCP for communication. Specifically we rely on the following property of TCP:</p>
-<dl>
-
-
-<dt>
-<term>
-<em>Ordered delivery</em>
-</term>
-</dt>
-<dd>
-<p>Data is delivered in the same order it is sent and a message m is 
-delivered only after all messages sent before m have been delivered. 
-(The corollary to this is that if message m is lost all messages after m will be lost.)</p>
-</dd>
-
-
-<dt>
-<term>
-<em>No message after close</em>
-</term>
-</dt>
-<dd>
-<p>Once a FIFO channel is closed, no messages will be received from it.</p>
-</dd>
-
-
-</dl>
-<p>
-FLP proved that consensus cannot be achieved in asynchronous distributed systems 
-if failures are possible. To ensure we achieve consensus in the presence of failures 
-we use timeouts. However, we rely on times for liveness not for correctness. So, 
-if timeouts stop working (clocks malfunction for example) the messaging system may 
-hang, but it will not violate its guarantees.</p>
-<p>When describing the ZooKeeper messaging protocol we will talk of packets, 
-proposals, and messages:</p>
-<dl>
-
-<dt>
-<term>
-<em>Packet</em>
-</term>
-</dt>
-<dd>
-<p>a sequence of bytes sent through a FIFO channel</p>
-</dd>
-<dt>
-<term>
-<em>Proposal</em>
-</term>
-</dt>
-<dd>
-<p>a unit of agreement. Proposals are agreed upon by exchanging packets 
-with a quorum of ZooKeeper servers. Most proposals contain messages, however the 
-NEW_LEADER proposal is an example of a proposal that does not correspond to a message.</p>
-</dd>
-<dt>
-<term>
-<em>Message</em>
-</term>
-</dt>
-<dd>
-<p>a sequence of bytes to be atomically broadcast to all ZooKeeper 
-servers. A message put into a proposal and agreed upon before it is delivered.</p>
-</dd>
-
-
-</dl>
-<p>
-As stated above, ZooKeeper guarantees a total order of messages, and it also 
-guarantees a total order of proposals. ZooKeeper exposes the total ordering using
-a ZooKeeper transaction id (<em>zxid</em>). All proposals will be stamped with a zxid when 
-it is proposed and exactly reflects the total ordering. Proposals are sent to all 
-ZooKeeper servers and committed when a quorum of them acknowledge the proposal. 
-If a proposal contains a message, the message will be delivered when the proposal 
-is committed. Acknowledgement means the server has recorded the proposal to persistent storage. 
-Our quorums have the requirement that any pair of quorum must have at least one server 
-in common. We ensure this by requiring that all quorums have size (<em>n/2+1</em>) where 
-n is the number of servers that make up a ZooKeeper service.
-</p>
-<p>
-The zxid has two parts: the epoch and a counter. In our implementation the zxid 
-is a 64-bit number. We use the high order 32-bits for the epoch and the low order 
-32-bits for the counter. Because it has two parts represent the zxid both as a 
-number and as a pair of integers, (<em>epoch, count</em>). The epoch number represents a 
-change in leadership. Each time a new leader comes into power it will have its 
-own epoch number. We have a simple algorithm to assign a unique zxid to a proposal: 
-the leader simply increments the zxid to obtain a unique zxid for each proposal. 
-<em>Leadership activation will ensure that only one leader uses a given epoch, so our 
-simple algorithm guarantees that every proposal will have a unique id.</em>
-
-</p>
-<p>
-ZooKeeper messaging consists of two phases:</p>
-<dl>
-
-<dt>
-<term>
-<em>Leader activation</em>
-</term>
-</dt>
-<dd>
-<p>In this phase a leader establishes the correct state of the system 
-and gets ready to start making proposals.</p>
-</dd>
-
-
-<dt>
-<term>
-<em>Active messaging</em>
-</term>
-</dt>
-<dd>
-<p>In this phase a leader accepts messages to propose and coordinates message delivery.</p>
-</dd>
-
-</dl>
-<p>
-ZooKeeper is a holistic protocol. We do not focus on individual proposals, rather 
-look at the stream of proposals as a whole. Our strict ordering allows us to do this 
-efficiently and greatly simplifies our protocol. Leadership activation embodies 
-this holistic concept. A leader becomes active only when a quorum of followers 
-(The leader counts as a follower as well. You can always vote for yourself ) has synced 
-up with the leader, they have the same state. This state consists of all of the 
-proposals that the leader believes have been committed and the proposal to follow 
-the leader, the NEW_LEADER proposal. (Hopefully you are thinking to 
-yourself, <em>Does the set of proposals that the leader believes has been committed 
-included all the proposals that really have been committed?</em> The answer is <em>yes</em>. 
-Below, we make clear why.)
-</p>
-<a name="sc_leaderElection"></a>
-<h3 class="h4">Leader Activation</h3>
-<p>
-Leader activation includes leader election. We currently have two leader election 
-algorithms in ZooKeeper: LeaderElection and FastLeaderElection (AuthFastLeaderElection 
-is a variant of FastLeaderElection that uses UDP and allows servers to perform a simple
-form of authentication to avoid IP spoofing). ZooKeeper messaging doesn't care about the 
-exact method of electing a leader has long as the following holds:
-</p>
-<ul>
-
-
-<li>
-<p>The leader has seen the highest zxid of all the followers.</p>
-</li>
-
-<li>
-<p>A quorum of servers have committed to following the leader.</p>
-</li>
-
-
-</ul>
-<p>
-Of these two requirements only the first, the highest zxid amoung the followers 
-needs to hold for correct operation. The second requirement, a quorum of followers, 
-just needs to hold with high probability. We are going to recheck the second requirement, 
-so if a failure happens during or after the leader election and quorum is lost, 
-we will recover by abandoning leader activation and running another election.
-</p>
-<p>
-After leader election a single server will be designated as a leader and start 
-waiting for followers to connect. The rest of the servers will try to connect to 
-the leader. The leader will sync up with followers by sending any proposals they 
-are missing, or if a follower is missing too many proposals, it will send a full 
-snapshot of the state to the follower.
-</p>
-<p>
-There is a corner case in which a follower that has proposals, U, not seen 
-by a leader arrives. Proposals are seen in order, so the proposals of U will have a zxids 
-higher than zxids seen by the leader. The follower must have arrived after the 
-leader election, otherwise the follower would have been elected leader given that 
-it has seen a higher zxid. Since committed proposals must be seen by a quorum of 
-servers, and a quorum of servers that elected the leader did not see U, the proposals 
-of you have not been committed, so they can be discarded. When the follower connects 
-to the leader, the leader will tell the follower to discard U.
-</p>
-<p>
-A new leader establishes a zxid to start using for new proposals by getting the 
-epoch, e, of the highest zxid it has seen and setting the next zxid to use to be 
-(e+1, 0), fter the leader syncs with a follower, it will propose a NEW_LEADER 
-proposal. Once the NEW_LEADER proposal has been committed, the leader will activate 
-and start receiving and issuing proposals.
-</p>
-<p>
-It all sounds complicated but here are the basic rules of operation during leader 
-activation:
-</p>
-<ul>
-
-<li>
-<p>A follower will ACK the NEW_LEADER proposal after it has synced with the leader.</p>
-</li>
-
-<li>
-<p>A follower will only ACK a NEW_LEADER proposal with a given zxid from a single server.</p>
-</li>
-
-<li>
-<p>A new leader will COMMIT the NEW_LEADER proposal when a quorum of followers have ACKed it.</p>
-</li>
-
-<li>
-<p>A follower will commit any state it received from the leader when the NEW_LEADER proposal is COMMIT.</p>
-</li>
-
-<li>
-<p>A new leader will not accept new proposals until the NEW_LEADER proposal has been COMMITED.</p>
-</li>
-
-</ul>
-<p>
-If leader election terminates erroneously, we don't have a problem since the 
-NEW_LEADER proposal will not be committed since the leader will not have quorum. 
-When this happens, the leader and any remaining followers will timeout and go back 
-to leader election.
-</p>
-<a name="sc_activeMessaging"></a>
-<h3 class="h4">Active Messaging</h3>
-<p>
-Leader Activation does all the heavy lifting. Once the leader is coronated he can 
-start blasting out proposals. As long as he remains the leader no other leader can 
-emerge since no other leader will be able to get a quorum of followers. If a new 
-leader does emerge, 
-it means that the leader has lost quorum, and the new leader will clean up any 
-mess left over during her leadership activation.
-</p>
-<p>ZooKeeper messaging operates similar to a classic two-phase commit.</p>
-<img alt="" src="images/2pc.jpg"><p>
-All communication channels are FIFO, so everything is done in order. Specifically 
-the following operating constraints are observed:</p>
-<ul>
-
-
-<li>
-<p>The leader sends proposals to all followers using 
-the same order. Moreover, this order follows the order in which requests have been 
-received. Because we use FIFO channels this means that followers also receive proposals in order.
-</p>
-</li>
-
-
-<li>
-<p>Followers process messages in the order they are received. This 
-means that messages will be ACKed in order and the leader will receive ACKs from 
-followers in order, due to the FIFO channels. It also means that if message $m$ 
-has been written to non-volatile storage, all messages that were proposed before 
-$m$ have been written to non-volatile storage.</p>
-</li>
-
-
-<li>
-<p>The leader will issue a COMMIT to all followers as soon as a 
-quorum of followers have ACKed a message. Since messages are ACKed in order, 
-COMMITs will be sent by the leader as received by the followers in order.</p>
-</li>
-
-
-<li>
-<p>COMMITs are processed in order. Followers deliver a proposals 
-message when that proposal is committed.</p>
-</li>
-
-
-</ul>
-<a name="sc_summary"></a>
-<h3 class="h4">Summary</h3>
-<p>So there you go. Why does it work? Specifically, why does a set of proposals 
-believed by a new leader always contain any proposal that has actually been committed? 
-First, all proposals have a unique zxid, so unlike other protocols, we never have 
-to worry about two different values being proposed for the same zxid; followers 
-(a leader is also a follower) see and record proposals in order; proposals are 
-committed in order; there is only one active leader at a time since followers only 
-follow a single leader at a time; a new leader has seen all committed proposals 
-from the previous epoch since it has seen the highest zxid from a quorum of servers; 
-any uncommited proposals from a previous epoch seen by a new leader will be committed 
-by that leader before it becomes active.</p>
-<a name="sc_comparisons"></a>
-<h3 class="h4">Comparisons</h3>
-<p>
-Isn't this just Multi-Paxos? No, Multi-Paxos requires some way of assuring that 
-there is only a single coordinator. We do not count on such assurances. Instead 
-we use the leader activation to recover from leadership change or old leaders 
-believing they are still active.
-</p>
-<p>
-Isn't this just Paxos? Your active messaging phase looks just like phase 2 of Paxos? 
-Actually, to us active messaging looks just like 2 phase commit without the need to 
-handle aborts. Active messaging is different from both in the sense that it has 
-cross proposal ordering requirements. If we do not maintain strict FIFO ordering of 
-all packets, it all falls apart. Also, our leader activation phase is different from 
-both of them. In particular, our use of epochs allows us to skip blocks of uncommitted
-proposals and to not worry about duplicate proposals for a given zxid.
-</p>
-</div>
-
-
-<a name="sc_quorum"></a>
-<h2 class="h3">Quorums</h2>
-<div class="section">
-<p>
-Atomic broadcast and leader election use the notion of quorum to guarantee a consistent
-view of the system. By default, ZooKeeper uses majority quorums, which means that every
-voting that happens in one of these protocols requires a majority to vote on. One example is
-acknowledging a leader proposal: the leader can only commit once it receives an
-acknowledgement from a quorum of servers.
-</p>
-<p>
-If we extract the properties that we really need from our use of majorities, we have that we only
-need to guarantee that groups of processes used to validate an operation by voting (e.g., acknowledging
-a leader proposal) pairwise intersect in at least one server. Using majorities guarantees such a property.
-However, there are other ways of constructing quorums different from majorities. For example, we can assign
-weights to the votes of servers, and say that the votes of some servers are more important. To obtain a quorum,
-we get enough votes so that the sum of weights of all votes is larger than half of the total sum of all weights.    
-</p>
-<p>
-A different construction that uses weights and is useful in wide-area deployments (co-locations) is a hierarchical
-one. With this construction, we split the servers into disjoint groups and assign weights to processes. To form 
-a quorum, we have to get a hold of enough servers from a majority of groups G, such that for each group g in G,
-the sum of votes from g is larger than half of the sum of weights in g. Interestingly, this construction enables
-smaller quorums. If we have, for example, 9 servers, we split them into 3 groups, and assign a weight of 1 to each
-server, then we are able to form quorums of size 4. Note that two subsets of processes composed each of a majority
-of servers from each of a majority of groups necessarily have a non-empty intersection. It is reasonable to expect
-that a majority of co-locations will have a majority of servers available with high probability. 
-</p>
-<p>
-With ZooKeeper, we provide a user with the ability of configuring servers to use majority quorums, weights, or a 
-hierarchy of groups.
-</p>
-</div>
-
-
-<a name="sc_logging"></a>
-<h2 class="h3">Logging</h2>
-<div class="section">
-<p>
-Zookeeper uses 
-<a href="http://www.slf4j.org/index.html">slf4j</a> as an abstraction layer for logging. 
-<a href="http://logging.apache.org/log4j">log4j</a> in version 1.2 is chosen as the final logging implementation for now.
-For better embedding support, it is planned in the future to leave the decision of choosing the final logging implementation to the end user.
-Therefore, always use the slf4j api to write log statements in the code, but configure log4j for how to log at runtime.
-Note that slf4j has no FATAL level, former messages at FATAL level have been moved to ERROR level. 
-For information on configuring log4j for
-ZooKeeper, see the <a href="zookeeperAdmin.html#sc_logging">Logging</a> section 
-of the <a href="zookeeperAdmin.html">ZooKeeper Administrator's Guide.</a>
-
-
-</p>
-<a name="sc_developerGuidelines"></a>
-<h3 class="h4">Developer Guidelines</h3>
-<p>Please follow the  
-<a href="http://www.slf4j.org/manual.html">slf4j manual</a> when creating log statements within code.
-Also read the
-<a href="http://www.slf4j.org/faq.html#logging_performance">FAQ on performance</a>
-, when creating log statements. Patch reviewers will look for the following:</p>
-<a name="sc_rightLevel"></a>
-<h4>Logging at the Right Level</h4>
-<p>
-There are several levels of logging in slf4j. 
-It's important to pick the right one. In order of higher to lower severity:</p>
-<ol>
-   
-<li>
-<p>ERROR level designates error events that might still allow the application to continue running.</p>
-</li>
-   
-<li>
-<p>WARN level designates potentially harmful situations.</p>
-</li>
-   
-<li>
-<p>INFO level designates informational messages that highlight the progress of the application at coarse-grained level.</p>
-</li>
-   
-<li>
-<p>DEBUG Level designates fine-grained informational events that are most useful to debug an application.</p>
-</li>
-   
-<li>
-<p>TRACE Level designates finer-grained informational events than the DEBUG.</p>
-</li>
-
-</ol>
-<p>
-ZooKeeper is typically run in production such that log messages of INFO level 
-severity and higher (more severe) are output to the log.</p>
-<a name="sc_slf4jIdioms"></a>
-<h4>Use of Standard slf4j Idioms</h4>
-<p>
-<em>Static Message Logging</em>
-</p>
-<pre class="code">
-LOG.debug("process completed successfully!");
-</pre>
-<p>
-However when creating parameterized messages are required, use formatting anchors.
-</p>
-<pre class="code">
-LOG.debug("got {} messages in {} minutes",new Object[]{count,time});    
-</pre>
-<p>
-<em>Naming</em>
-</p>
-<p>
-Loggers should be named after the class in which they are used.
-</p>
-<pre class="code">
-public class Foo {
-    private static final Logger LOG = LoggerFactory.getLogger(Foo.class);
-    ....
-    public Foo() {
-       LOG.info("constructing Foo");
-</pre>
-<p>
-<em>Exception handling</em>
-</p>
-<pre class="code">
-try {
-  // code
-} catch (XYZException e) {
-  // do this
-  LOG.error("Something bad happened", e);
-  // don't do this (generally)
-  // LOG.error(e);
-  // why? because "don't do" case hides the stack trace
- 
-  // continue process here as you need... recover or (re)throw
-}
-</pre>
-</div>
-
-
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-<div id="content">
-<div title="Portable Document Format" class="pdflink">
-<a class="dida" href="zookeeperJMX.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br>
-        PDF</a>
-</div>
-<h1>ZooKeeper JMX</h1>
-<div id="front-matter">
-<div id="minitoc-area">
-<ul class="minitoc">
-<li>
-<a href="#ch_jmx">JMX</a>
-</li>
-<li>
-<a href="#ch_starting">Starting ZooKeeper with JMX enabled</a>
-</li>
-<li>
-<a href="#ch_console">Run a JMX console</a>
-</li>
-<li>
-<a href="#ch_reference">ZooKeeper MBean Reference</a>
-</li>
-</ul>
-</div>
-</div>
-  
-
-  
-
-  
-<a name="ch_jmx"></a>
-<h2 class="h3">JMX</h2>
-<div class="section">
-<p>Apache ZooKeeper has extensive support for JMX, allowing you
-    to view and manage a ZooKeeper serving ensemble.</p>
-<p>This document assumes that you have basic knowledge of
-    JMX. See <a href="http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/">
-    Sun JMX Technology</a> page to get started with JMX.
-    </p>
-<p>See the <a href="http://java.sun.com/javase/6/docs/technotes/guides/management/agent.html">
-    JMX Management Guide</a> for details on setting up local and
-    remote management of VM instances. By default the included
-    <em>zkServer.sh</em> supports only local management -
-    review the linked document to enable support for remote management
-    (beyond the scope of this document).
-    </p>
-</div>
-
-  
-<a name="ch_starting"></a>
-<h2 class="h3">Starting ZooKeeper with JMX enabled</h2>
-<div class="section">
-<p>The class
-      <em>org.apache.zookeeper.server.quorum.QuorumPeerMain</em>
-      will start a JMX manageable ZooKeeper server. This class
-      registers the proper MBeans during initalization to support JMX
-      monitoring and management of the
-      instance. See <em>bin/zkServer.sh</em> for one
-      example of starting ZooKeeper using QuorumPeerMain.</p>
-</div>
-
-  
-<a name="ch_console"></a>
-<h2 class="h3">Run a JMX console</h2>
-<div class="section">
-<p>There are a number of JMX consoles available which can connect
-      to the running server. For this example we will use Sun's
-      <em>jconsole</em>.</p>
-<p>The Java JDK ships with a simple JMX console
-      named <a href="http://java.sun.com/developer/technicalArticles/J2SE/jconsole.html">jconsole</a>
-      which can be used to connect to ZooKeeper and inspect a running
-      server. Once you've started ZooKeeper using QuorumPeerMain
-      start <em>jconsole</em>, which typically resides in
-      <em>JDK_HOME/bin/jconsole</em>
-</p>
-<p>When the "new connection" window is displayed either connect
-      to local process (if jconsole started on same host as Server) or
-      use the remote process connection.</p>
-<p>By default the "overview" tab for the VM is displayed (this
-      is a great way to get insight into the VM btw). Select
-      the "MBeans" tab.</p>
-<p>You should now see <em>org.apache.ZooKeeperService</em>
-      on the left hand side. Expand this item and depending on how you've
-      started the server you will be able to monitor and manage various
-      service related features.</p>
-<p>Also note that ZooKeeper will register log4j MBeans as
-    well. In the same section along the left hand side you will see
-    "log4j". Expand that to manage log4j through JMX. Of particular
-    interest is the ability to dynamically change the logging levels
-    used by editing the appender and root thresholds. Log4j MBean
-    registration can be disabled by passing
-    <em>-Dzookeeper.jmx.log4j.disable=true</em> to the JVM
-    when starting ZooKeeper.
-    </p>
-</div>
-
-  
-<a name="ch_reference"></a>
-<h2 class="h3">ZooKeeper MBean Reference</h2>
-<div class="section">
-<p>This table details JMX for a server participating in a
-    replicated ZooKeeper ensemble (ie not standalone). This is the
-    typical case for a production environment.</p>
-<table class="ForrestTable" cellspacing="1" cellpadding="4">
-<caption>MBeans, their names and description</caption>
-      
-<title>MBeans, their names and description</title>
-
-      
-          
-<tr>
-            
-<th>MBean</th>
-            <th>MBean Object Name</th>
-            <th>Description</th>
-          
-</tr>
-        
-          
-<tr>
-            
-<td>Quorum</td>
-            <td>ReplicatedServer_id&lt;#&gt;</td>
-            <td>Represents the Quorum, or Ensemble - parent of all
-            cluster members. Note that the object name includes the
-            "myid" of the server (name suffix) that your JMX agent has
-            connected to.</td>
-          
-</tr>
-          
-<tr>
-            
-<td>LocalPeer|RemotePeer</td>
-            <td>replica.&lt;#&gt;</td>
-            <td>Represents a local or remote peer (ie server
-            participating in the ensemble). Note that the object name
-            includes the "myid" of the server (name suffix).</td>
-          
-</tr>
-          
-<tr>
-            
-<td>LeaderElection</td>
-            <td>LeaderElection</td>
-            <td>Represents a ZooKeeper cluster leader election which is
-            in progress. Provides information about the election, such as
-            when it started.</td>
-          
-</tr>
-          
-<tr>
-            
-<td>Leader</td>
-            <td>Leader</td>
-            <td>Indicates that the parent replica is the leader and
-            provides attributes/operations for that server. Note that
-            Leader is a subclass of ZooKeeperServer, so it provides
-            all of the information normally associated with a
-            ZooKeeperServer node.</td>
-          
-</tr>
-          
-<tr>
-            
-<td>Follower</td>
-            <td>Follower</td>
-            <td>Indicates that the parent replica is a follower and
-            provides attributes/operations for that server. Note that
-            Follower is a subclass of ZooKeeperServer, so it provides
-            all of the information normally associated with a
-            ZooKeeperServer node.</td>
-          
-</tr>
-          
-<tr>
-            
-<td>DataTree</td>
-            <td>InMemoryDataTree</td>
-            <td>Statistics on the in memory znode database, also
-            operations to access finer (and more computationally
-            intensive) statistics on the data (such as ephemeral
-            count). InMemoryDataTrees are children of ZooKeeperServer
-            nodes.</td>
-          
-</tr>
-          
-<tr>
-            
-<td>ServerCnxn</td>
-            <td>&lt;session_id&gt;</td>
-            <td>Statistics on each client connection, also
-            operations on those connections (such as
-            termination). Note the object name is the session id of
-            the connection in hex form.</td>
-          
-</tr>
-    
-</table>
-<p>This table details JMX for a standalone server. Typically
-    standalone is only used in development situations.</p>
-<table class="ForrestTable" cellspacing="1" cellpadding="4">
-<caption>MBeans, their names and description</caption>
-      
-<title>MBeans, their names and description</title>
-
-      
-          
-<tr>
-            
-<th>MBean</th>
-            <th>MBean Object Name</th>
-            <th>Description</th>
-          
-</tr>
-        
-          
-<tr>
-            
-<td>ZooKeeperServer</td>
-            <td>StandaloneServer_port&lt;#&gt;</td>
-            <td>Statistics on the running server, also operations
-            to reset these attributes. Note that the object name
-            includes the client port of the server (name
-            suffix).</td>
-          
-</tr>
-          
-<tr>
-            
-<td>DataTree</td>
-            <td>InMemoryDataTree</td>
-            <td>Statistics on the in memory znode database, also
-            operations to access finer (and more computationally
-            intensive) statistics on the data (such as ephemeral
-            count).</td>
-          
-</tr>
-          
-<tr>
-            
-<td>ServerCnxn</td>
-            <td>&lt;session_id&gt;</td>
-            <td>Statistics on each client connection, also
-            operations on those connections (such as
-            termination). Note the object name is the session id of
-            the connection in hex form.</td>
-          
-</tr>
-    
-</table>
-</div>
-
-
-<p align="right">
-<font size="-2"></font>
-</p>
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http://git-wip-us.apache.org/repos/asf/zookeeper/blob/e5fc1228/docs/zookeeperJMX.pdf
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-        PDF</a>
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-<div id="front-matter">
-<div id="minitoc-area">
-<ul class="minitoc">
-<li>
-<a href="#ch_Introduction">Observers: Scaling ZooKeeper Without Hurting Write Performance
-      </a>
-</li>
-<li>
-<a href="#sc_UsingObservers">How to use Observers</a>
-</li>
-<li>
-<a href="#ch_UseCases">Example use cases</a>
-</li>
-</ul>
-</div>
-</div>
-  
-
-  
-
-  
-<a name="ch_Introduction"></a>
-<h2 class="h3">Observers: Scaling ZooKeeper Without Hurting Write Performance
-      </h2>
-<div class="section">
-<p>
-      Although ZooKeeper performs very well by having clients connect directly
-      to voting members of the ensemble, this architecture makes it hard to
-      scale out to huge numbers of clients. The problem is that as we add more
-      voting members, the write performance drops. This is due to the fact that
-      a write operation requires the agreement of (in general) at least half the
-      nodes in an ensemble and therefore the cost of a vote can increase
-      significantly as more voters are added.
-    </p>
-<p>
-      We have introduced a new type of ZooKeeper node called
-      an <em>Observer</em> which helps address this problem and
-      further improves ZooKeeper's scalability. Observers are non-voting members
-      of an ensemble which only hear the results of votes, not the agreement
-      protocol that leads up to them. Other than this simple distinction,
-      Observers function exactly the same as Followers - clients may connect to
-      them and send read and write requests to them. Observers forward these
-      requests to the Leader like Followers do, but they then simply wait to
-      hear the result of the vote. Because of this, we can increase the number
-      of Observers as much as we like without harming the performance of votes.
-    </p>
-<p>
-      Observers have other advantages. Because they do not vote, they are not a
-      critical part of the ZooKeeper ensemble. Therefore they can fail, or be
-      disconnected from the cluster, without harming the availability of the
-      ZooKeeper service. The benefit to the user is that Observers may connect
-      over less reliable network links than Followers. In fact, Observers may be
-      used to talk to a ZooKeeper server from another data center. Clients of
-      the Observer will see fast reads, as all reads are served locally, and
-      writes result in minimal network traffic as the number of messages
-      required in the absence of the vote protocol is smaller.
-    </p>
-</div>
-  
-<a name="sc_UsingObservers"></a>
-<h2 class="h3">How to use Observers</h2>
-<div class="section">
-<p>Setting up a ZooKeeper ensemble that uses Observers is very simple,
-    and requires just two changes to your config files. Firstly, in the config
-    file of every node that is to be an Observer, you must place this line:
-    </p>
-<pre class="code">
-      peerType=observer
-    </pre>
-<p>
-      This line tells ZooKeeper that the server is to be an Observer. Secondly,
-      in every server config file, you must add :observer to the server
-      definition line of each Observer. For example:
-    </p>
-<pre class="code">
-      server.1:localhost:2181:3181:observer
-    </pre>
-<p>
-      This tells every other server that server.1 is an Observer, and that they
-      should not expect it to vote. This is all the configuration you need to do
-      to add an Observer to your ZooKeeper cluster. Now you can connect to it as
-      though it were an ordinary Follower. Try it out, by running:</p>
-<pre class="code">
-      $ bin/zkCli.sh -server localhost:2181
-    </pre>
-<p>
-      where localhost:2181 is the hostname and port number of the Observer as
-      specified in every config file. You should see a command line prompt
-      through which you can issue commands like <em>ls</em> to query
-      the ZooKeeper service.
-    </p>
-</div>
-  
-  
-<a name="ch_UseCases"></a>
-<h2 class="h3">Example use cases</h2>
-<div class="section">
-<p>
-      Two example use cases for Observers are listed below. In fact, wherever
-      you wish to scale the number of clients of your ZooKeeper ensemble, or
-      where you wish to insulate the critical part of an ensemble from the load
-      of dealing with client requests, Observers are a good architectural
-      choice.
-    </p>
-<ul>
-      
-<li>
-	
-<p> As a datacenter bridge: Forming a ZK ensemble between two
-	datacenters is a problematic endeavour as the high variance in latency
-	between the datacenters could lead to false positive failure detection
-	and partitioning. However if the ensemble runs entirely in one
-	datacenter, and the second datacenter runs only Observers, partitions
-	aren't problematic as the ensemble remains connected. Clients of the
-	Observers may still see and issue proposals.</p>
-      
-</li>
-      
-<li>
-	
-<p>As a link to a message bus: Some companies have expressed an
-	interest in using ZK as a component of a persistent reliable message
-	bus. Observers would give a natural integration point for this work: a
-	plug-in mechanism could be used to attach the stream of proposals an
-	Observer sees to a publish-subscribe system, again without loading the
-	core ensemble.
-	</p>
-      
-</li>
-    
-</ul>
-</div>
-
-<p align="right">
-<font size="-2"></font>
-</p>
-</div>
-<!--+
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-    +-->
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http://git-wip-us.apache.org/repos/asf/zookeeper/blob/e5fc1228/docs/zookeeperOtherInfo.pdf
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