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From an...@apache.org
Subject [17/18] zookeeper git commit: ZOOKEEPER-3155: Remove Forrest XMLs and their build process from the …
Date Fri, 09 Nov 2018 16:41:54 GMT
http://git-wip-us.apache.org/repos/asf/zookeeper/blob/ab59048a/docs/bookkeeperStarted.html
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-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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-        PDF</a>
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-<h1>BookKeeper Getting Started Guide</h1>
-<div id="front-matter">
-<div id="minitoc-area">
-<ul class="minitoc">
-<li>
-<a href="#bk_GettingStarted">Getting Started: Setting up BookKeeper to write logs.</a>
-<ul class="minitoc">
-<li>
-<a href="#bk_Prerequisites">Pre-requisites</a>
-</li>
-<li>
-<a href="#bk_Download">Download</a>
-</li>
-<li>
-<a href="#bk_localBK">LocalBookKeeper</a>
-</li>
-<li>
-<a href="#bk_setupBookies">Setting up bookies</a>
-</li>
-<li>
-<a href="#bk_setupZK">Setting up ZooKeeper</a>
-</li>
-<li>
-<a href="#bk_example">Example</a>
-</li>
-</ul>
-</li>
-</ul>
-</div>
-</div>
-  
-
-  
-  
-<a name="bk_GettingStarted"></a>
-<h2 class="h3">Getting Started: Setting up BookKeeper to write logs.</h2>
-<div class="section">
-<p>This document contains information to get you started quickly with
-    BookKeeper. It is aimed primarily at developers willing to try it out, and
-    contains simple installation instructions for a simple BookKeeper installation
-    and a simple programming example. For further programming detail, please refer to 
-    <a href="bookkeeperProgrammer.html">BookKeeper Programmer's Guide</a>.
-    </p>
-<a name="bk_Prerequisites"></a>
-<h3 class="h4">Pre-requisites</h3>
-<p>See <a href="bookkeeperConfig.html#bk_sysReq">
-    	      System Requirements</a> in the Admin guide.</p>
-<a name="bk_Download"></a>
-<h3 class="h4">Download</h3>
-<p> BookKeeper is distributed along with ZooKeeper. To get a ZooKeeper distribution, 
-			   download a recent
-    	    <a href="http://zookeeper.apache.org/releases.html">
-        	  stable</a> release from one of the Apache Download
-       	 Mirrors.</p>
-<a name="bk_localBK"></a>
-<h3 class="h4">LocalBookKeeper</h3>
-<p> Under org.apache.bookkeeper.util, you'll find a java program
-		called LocalBookKeeper.java that sets you up to run BookKeeper on a 
-		single machine. This is far from ideal from a performance perspective,
-		but the program is useful for both test and educational purposes.
-		</p>
-<a name="bk_setupBookies"></a>
-<h3 class="h4">Setting up bookies</h3>
-<p> If you're bold and you want more than just running things locally, then
-		you'll need to run bookies in different servers. You'll need at least three bookies
-		to start with.  
-		</p>
-<p>
-		For each bookie, we need to execute a command like the following:
-		</p>
-<p>
-<span class="codefrag computeroutput">
-		java -cp .:./zookeeper-&lt;version&gt;-bookkeeper.jar:./zookeeper-&lt;version&gt;.jar\
-		:lib/slf4j-api-1.6.1.jar:lib/slf4j-log4j12-1.6.1.jar:lib/log4j-1.2.15.jar -Dlog4j.configuration=log4j.properties\ 
-		org.apache.bookkeeper.proto.BookieServer 3181 127.0.0.1:2181 /path_to_log_device/\
-		/path_to_ledger_device/
-		</span>
-</p>
-<p> "/path_to_log_device/" and "/path_to_ledger_device/" are different paths. Also, port 3181
-		is the port that a bookie listens on for connection requests from clients. 127.0.0.1:2181 is the hostname:port 
-		for the ZooKeeper server. In this example, the standalone ZooKeeper server is running locally on port 2181.
-		If we had multiple ZooKeeper servers, this parameter would be a comma separated list of all the hostname:port
-		values corresponding to them.
-		</p>
-<a name="bk_setupZK"></a>
-<h3 class="h4">Setting up ZooKeeper</h3>
-<p> ZooKeeper stores metadata on behalf of BookKeeper clients and bookies. To get a minimal 
-	  	ZooKeeper installation to work with BookKeeper, we can set up one server running in
-	  	standalone mode. Once we have the server running, we need to create a few znodes:
-	  	</p>
-<ol>
-	  	
-<li>
-	  	
-<p>
-<span class="codefrag computeroutput">
-	  	/ledgers	
-	  	</span>
-</p>
-	  	
-</li>
-	  	
-	  	
-<li>
-	  	
-<p>
-<span class="codefrag computeroutput">
-	  	/ledgers/available
-	  	</span>
-</p>
-	  	
-</li>
-	  	
-	  	
-<li>
-	  	
-<p> For each bookie, we add one znode such that the name of the znode is the
-	  	concatenation of the machine name and the port number that the bookie is 
-	  	listening on. For example, if a bookie is running on bookie.foo.com an is listening 
-	  	on port 3181, we add a znode 
-	  	<span class="codefrag computeroutput">/ledgers/available/bookie.foo.com:3181</span>.  
-	  	</p>
-	  	
-</li>
-	  	
-</ol>
-<a name="bk_example"></a>
-<h3 class="h4">Example</h3>
-<p>
-	    In the following excerpt of code, we:
-	    </p>
-<ol>
-	    	
-<li>
-	    	
-<p>
-	    	Create a ledger;
-	    	</p>
-	    	
-</li>
-	    	
-	    	
-<li>
-	    	
-<p>
-	    	Write to the ledger;
-	    	</p>
-	    	
-</li>
-	    	
-	    	
-<li>
-	    	
-<p>
-	    	Close the ledger;
-	    	</p>
-	    	
-</li>
-	    	
-	    	
-<li>
-	    	
-<p>
-	    	Open the same ledger for reading;
-	    	</p>
-	    	
-</li>
-	    	
-	    	
-<li>
-	    	
-<p>
-	    	Read from the ledger;
-	    	</p>
-	    	
-</li>
-	    	
-	    	
-<li>
-	    	
-<p>
-	    	Close the ledger again;
-	    	</p>
-	    	
-</li>
-	    
-</ol>
-<pre class="code">
-LedgerHandle lh = bkc.createLedger(ledgerPassword);
-ledgerId = lh.getId();
-ByteBuffer entry = ByteBuffer.allocate(4);
-
-for(int i = 0; i &lt; 10; i++){
-	entry.putInt(i);
-	entry.position(0);
-	entries.add(entry.array());				
-	lh.addEntry(entry.array());
-}
-lh.close();
-lh = bkc.openLedger(ledgerId, ledgerPassword);		
-			
-Enumeration&lt;LedgerEntry&gt; ls = lh.readEntries(0, 9);
-int i = 0;
-while(ls.hasMoreElements()){
-	ByteBuffer origbb = ByteBuffer.wrap(
-				entries.get(i++));
-	Integer origEntry = origbb.getInt();
-	ByteBuffer result = ByteBuffer.wrap(
-				ls.nextElement().getEntry());
-
-	Integer retrEntry = result.getInt();
-}
-lh.close();
-	    </pre>
-</div>
-
-<p align="right">
-<font size="-2"></font>
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http://git-wip-us.apache.org/repos/asf/zookeeper/blob/ab59048a/docs/bookkeeperStarted.pdf
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http://git-wip-us.apache.org/repos/asf/zookeeper/blob/ab59048a/docs/bookkeeperStream.html
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-        PDF</a>
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-<h1>Streaming with BookKeeper</h1>
-<div id="front-matter">
-<div id="minitoc-area">
-<ul class="minitoc">
-<li>
-<a href="#bk_StreamSummary">Summary</a>
-</li>
-<li>
-<a href="#bk_LedgerOutputStream">Writing a stream of bytes</a>
-</li>
-<li>
-<a href="#bk_LedgerInputStream">Reading a stream of bytes</a>
-</li>
-</ul>
-</div>
-</div>
-  
-
-  
-	
-<a name="bk_StreamSummary"></a>
-<h2 class="h3">Summary</h2>
-<div class="section">
-<p>
-    When using the BookKeeper API, an application has to split the data to write into entries, each
-    entry being a byte array. This is natural for many applications. For example, when using BookKeeper
-    for write-ahead logging, an application typically wants to write the modifications corresponding
-    to a command or a transaction. Some other applications, however, might not have a natural boundary
-    for entries, and may prefer to write and read streams of bytes. This is exactly the purpose of the
-    stream API we have implemented on top of BookKeeper.
-    </p>
-<p>
-    The stream API is implemented in the package <span class="codefrag computeroutput">Streaming</span>, and it contains two main classes: <span class="codefrag computeroutput">LedgerOutputStream</span> and 
-    <span class="codefrag computeroutput">LedgerInputStream</span>. The class names are indicative of what they do.
-    </p>
-</div>
-    
-    
-<a name="bk_LedgerOutputStream"></a>
-<h2 class="h3">Writing a stream of bytes</h2>
-<div class="section">
-<p>
-    Class <span class="codefrag computeroutput">LedgerOutputStream</span> implements two constructors and five public methods:
-    </p>
-<p>
-    
-<span class="codefrag computeroutput">
-	public LedgerOutputStream(LedgerHandle lh) 
-    </span>
-	
-</p>
-<p>
-    where:
-    </p>
-<ul>
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">lh</span> is a ledger handle for a previously created and open ledger.  
-    	</p>
-    	
-</li>
-    
-</ul>
-<p>
-    
-<span class="codefrag computeroutput">
-	public LedgerOutputStream(LedgerHandle lh, int size) 
-    </span>
-	
-</p>
-<p>
-    where:
-    </p>
-<ul>
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">lh</span> is a ledger handle for a previously created and open ledger.  
-    	</p>
-    	
-</li>
-
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">size</span> is the size of the byte buffer to store written bytes before flushing.  
-    	</p>
-    	
-</li>
-    
-</ul>
-<p>
-   	
-<strong>Closing a stream.</strong> This call closes the stream by flushing the write buffer.
-   	</p>
-<p>
-    
-<span class="codefrag computeroutput">
-	public void close() 
-    </span>
-	
-</p>
-<p>
-    which has no parameters.
-    </p>
-<p>
-   	
-<strong>Flushing a stream.</strong> This call essentially flushes the write buffer.
-   	</p>
-<p>
-    
-<span class="codefrag computeroutput">
-	public synchronized void flush() 
-    </span>
-	
-</p>
-<p>
-    which has no parameters.
-    </p>
-<p>
-   	
-<strong>Writing bytes.</strong> There are three calls for writing bytes to a stream.
-   	</p>
-<p>
-    
-<span class="codefrag computeroutput">
-	public synchronized void write(byte[] b) 
-    </span>
-	
-</p>
-<p>
-    where:
-    </p>
-<ul>
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">b</span> is an array of bytes to write.  
-    	</p>
-    	
-</li>
-    
-</ul>
-<p>
-    
-<span class="codefrag computeroutput">
-	public synchronized void write(byte[] b, int off, int len) 
-    </span>
-	
-</p>
-<p>
-    where:
-    </p>
-<ul>
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">b</span> is an array of bytes to write.  
-    	</p>
-    	
-</li>
-    	
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">off</span> is a buffer offset.  
-    	</p>
-    	
-</li>
-    	
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">len</span> is the length to write.  
-    	</p>
-    	
-</li>
-    
-</ul>
-<p>
-    
-<span class="codefrag computeroutput">
-	public synchronized void write(int b) 
-    </span>
-	
-</p>
-<p>
-    where:
-    </p>
-<ul>
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">b</span> contains a byte to write. The method writes the least significant byte of the integer four bytes.    
-    	</p>
-    	
-</li>
-    
-</ul>
-</div>
-    
-    
-<a name="bk_LedgerInputStream"></a>
-<h2 class="h3">Reading a stream of bytes</h2>
-<div class="section">
-<p>
-    Class <span class="codefrag computeroutput">LedgerOutputStream</span> implements two constructors and four public methods:
-    </p>
-<p>
-    
-<span class="codefrag computeroutput">
-	public LedgerInputStream(LedgerHandle lh)
-	throws BKException, InterruptedException 
-    </span>
-	
-</p>
-<p>
-    where:
-    </p>
-<ul>
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">lh</span> is a ledger handle for a previously created and open ledger.  
-    	</p>
-    	
-</li>
-    
-</ul>
-<p>
-    
-<span class="codefrag computeroutput">
-	public LedgerInputStream(LedgerHandle lh, int size) 
-    throws BKException, InterruptedException
-    </span>
-	
-</p>
-<p>
-    where:
-    </p>
-<ul>
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">lh</span> is a ledger handle for a previously created and open ledger.  
-    	</p>
-    	
-</li>
-
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">size</span> is the size of the byte buffer to store bytes that the application
-        will eventually read.  
-    	</p>
-    	
-</li>
-    
-</ul>
-<p>
-   	
-<strong>Closing.</strong> There is one call to close an input stream, but the call
-   	is currently empty and the application is responsible for closing the ledger handle. 
-   	</p>
-<p>
-    
-<span class="codefrag computeroutput">
-	public void close()
-    </span>
-	
-</p>
-<p>
-    which has no parameters.
-    </p>
-<p>
-   	
-<strong>Reading.</strong> There are three calls to read from the stream.
-   	</p>
-<p>
-    
-<span class="codefrag computeroutput">
-	public synchronized int read()
-	throws IOException 
-    </span>
-	
-</p>
-<p>
-    which has no parameters.
-    </p>
-<p>
-    
-<span class="codefrag computeroutput">
-	public synchronized int read(byte[] b)
-	throws IOException 
-    </span>
-	
-</p>
-<p>
-    where:
-    </p>
-<ul>
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">b</span> is a byte array to write to.  
-    	</p>
-    	
-</li>
-    
-</ul>
-<p>
-    
-<span class="codefrag computeroutput">
-	public synchronized int read(byte[] b, int off, int len)
-	throws IOException 
-    </span>
-	
-</p>
-<p>
-    where:
-    </p>
-<ul>
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">b</span> is a byte array to write to.  
-    	</p>
-    	
-</li>
-    	
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">off</span> is an offset for byte array <span class="codefrag computeroutput">b</span>.  
-    	</p>
-    	
-</li>
-    	
-    	
-<li>
-    	
-<p> 
-        
-<span class="codefrag computeroutput">len</span> is the length in bytes to write to <span class="codefrag computeroutput">b</span>.  
-    	</p>
-    	
-</li>
-    
-</ul>
-</div>
-  
-<p align="right">
-<font size="-2"></font>
-</p>
-</div>
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-    +-->
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-</div>
-<h1>ZooKeeper: Because Coordinating Distributed Systems is a Zoo</h1>
-<div id="front-matter"></div>
-    
-<p>ZooKeeper is a high-performance coordination service for
-      distributed applications.  It exposes common services - such as
-      naming, configuration management, synchronization, and group
-      services - in a simple interface so you don't have to write them
-      from scratch.  You can use it off-the-shelf to implement
-      consensus, group management, leader election, and presence
-      protocols. And you can build on it for your own, specific needs.
-    </p>
-
-    
-<p>
-      The following documents describe concepts and procedures to get
-      you started using ZooKeeper. If you have more questions, please
-      ask the <a href="http://zookeeper.apache.org/mailing_lists.html">mailing list</a> or browse the
-      archives.
-    </p>
-    
-<ul>
-
-      
-<li>
-<strong>ZooKeeper Overview</strong>
-<p>Technical Overview Documents for Client Developers, Adminstrators, and Contributors</p>
-      
-<ul>
-<li>
-<a href="zookeeperOver.html">Overview</a> - a bird's eye view of ZooKeeper, including design concepts and architecture</li>
-      
-<li>
-<a href="zookeeperStarted.html">Getting Started</a> - a tutorial-style guide for developers to install, run, and program to ZooKeeper</li>
-      
-<li>
-<a href="releasenotes.html">Release Notes</a> - new developer and user facing features, improvements, and incompatibilities</li>
-      
-</ul>
-      
-</li>
-      
-      
-<li>
-<strong>Developers</strong>
-<p> Documents for Developers using the ZooKeeper Client API</p>
-      
-<ul>
-            
-<li>
-<a href="api/index.html">API Docs</a> - the technical reference to ZooKeeper Client APIs</li>
-      
-<li>
-<a href="zookeeperProgrammers.html">Programmer's Guide</a> - a client application developer's guide to ZooKeeper</li>
-      
-<li>
-<a href="javaExample.html">ZooKeeper Java Example</a> - a simple Zookeeper client appplication, written in Java</li>
-      
-<li>
-<a href="zookeeperTutorial.html">Barrier and Queue Tutorial</a> - sample implementations of barriers and queues</li>  
-      
-<li>
-<a href="recipes.html">ZooKeeper Recipes</a> - higher level solutions to common problems in distributed applications</li>
-      
-</ul>
-      
-</li>
-      
-      
-<li>
-<strong>Administrators &amp; Operators</strong> 
-<p> Documents for Administrators and Operations Engineers of ZooKeeper Deployments</p>
-      
-<ul>
-      
-<li>
-<a href="zookeeperAdmin.html">Administrator's Guide</a> - a guide for system administrators and anyone else who might deploy ZooKeeper</li>
-      
-<li>
-<a href="zookeeperQuotas.html">Quota Guide</a> - a guide for system administrators on Quotas in ZooKeeper. </li>
-      
-<li>
-<a href="zookeeperJMX.html">JMX</a> - how to enable JMX in ZooKeeper</li>
-      
-<li>
-<a href="zookeeperHierarchicalQuorums.html">Hierarchical quorums</a>
-</li>
-      
-<li>
-<a href="zookeeperObservers.html">Observers</a> - non-voting ensemble members that easily improve ZooKeeper's scalability</li>
-      
-<li>
-<a href="zookeeperReconfig.html">Dynamic Reconfiguration</a> - a guide on how to use dynamic reconfiguration in ZooKeeper</li>
-      
-</ul>
-      
-</li>
-      
-      
-<li>
-<strong>Contributors</strong>
-<p> Documents for Developers Contributing to the ZooKeeper Open Source Project</p>
-      
-<ul>
-      
-<li>
-<a href="zookeeperInternals.html">ZooKeeper Internals</a> - assorted topics on the inner workings of ZooKeeper</li>
-      
-</ul>
-      
-</li>
-      
-      
-<li>
-<strong>Miscellaneous ZooKeeper Documentation</strong>
-      
-<ul>
-      
-<li>
-<a href="https://cwiki.apache.org/confluence/display/ZOOKEEPER">Wiki</a>
-</li>
-      
-<li>
-<a href="https://cwiki.apache.org/confluence/display/ZOOKEEPER/FAQ">FAQ</a>
-</li>    
-      
-</ul>
-      
-</li>
-    
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-</div>
-<h1>ZooKeeper Java Example</h1>
-<div id="front-matter">
-<div id="minitoc-area">
-<ul class="minitoc">
-<li>
-<a href="#ch_Introduction">A Simple Watch Client</a>
-<ul class="minitoc">
-<li>
-<a href="#sc_requirements">Requirements</a>
-</li>
-<li>
-<a href="#sc_design">Program Design</a>
-</li>
-</ul>
-</li>
-<li>
-<a href="#sc_executor">The Executor Class</a>
-</li>
-<li>
-<a href="#sc_DataMonitor">The DataMonitor Class</a>
-</li>
-<li>
-<a href="#sc_completeSourceCode">Complete Source Listings</a>
-</li>
-</ul>
-</div>
-</div>
-  
-
-  
-
-  
-<a name="ch_Introduction"></a>
-<h2 class="h3">A Simple Watch Client</h2>
-<div class="section">
-<p>To introduce you to the ZooKeeper Java API, we develop here a very simple 
-    watch client. This ZooKeeper client watches a ZooKeeper node for changes 
-    and responds to by starting or stopping a program.</p>
-<a name="sc_requirements"></a>
-<h3 class="h4">Requirements</h3>
-<p>The client has four requirements:</p>
-<ul>
-<li>
-<p>It takes as parameters:</p>
-        
-<ul>
-        
-<li>
-<p>the address of the ZooKeeper service</p>
-</li>
-        
-<li>
-<p>the name of a znode - the one to be watched</p>
-</li>
-        
-<li>
-<p>the name of a file to write the output to</p>
-</li>
-        
-<li>
-<p>an executable with arguments.</p>
-</li>
-</ul>
-</li>
-    
-<li>
-<p>It fetches the data associated with the znode and starts the executable.</p>
-</li>
-    
-<li>
-<p>If the znode changes, the client refetches the contents and restarts the executable.</p>
-</li>
-    
-<li>
-<p>If the znode disappears, the client kills the executable.</p>
-</li>
-</ul>
-<a name="sc_design"></a>
-<h3 class="h4">Program Design</h3>
-<p>Conventionally, ZooKeeper applications are broken into two units, one which maintains the connection, 
-   and the other which monitors data.  In this application, the class called the <strong>Executor</strong> 
-   maintains the ZooKeeper connection, and the class called the  <strong>DataMonitor</strong> monitors the data
-   in the ZooKeeper tree. Also, Executor contains the main thread and contains the execution logic.
-   It is responsible for what little user interaction there is, as well as interaction with the exectuable program you
-   pass in as an argument and which the sample (per the requirements) shuts down and restarts, according to the 
-   state of the znode.</p>
-</div>
-
-   
-<a name="sc_executor"></a>
-<h2 class="h3">The Executor Class</h2>
-<div class="section">
-<p>The Executor object is the primary container of the sample application. It contains 
-    both the <strong>ZooKeeper</strong> object, <strong>DataMonitor</strong>, as described above in 
-    <a href="#sc_design">Program Design</a>.  </p>
-<pre class="code">
-    // from the Executor class...
-    
-    public static void main(String[] args) {
-        if (args.length &lt; 4) {
-            System.err
-                    .println("USAGE: Executor hostPort znode filename program [args ...]");
-            System.exit(2);
-        }
-        String hostPort = args[0];
-        String znode = args[1];
-        String filename = args[2];
-        String exec[] = new String[args.length - 3];
-        System.arraycopy(args, 3, exec, 0, exec.length);
-        try {
-            new Executor(hostPort, znode, filename, exec).run();
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-    }
-
-    public Executor(String hostPort, String znode, String filename,
-            String exec[]) throws KeeperException, IOException {
-        this.filename = filename;
-        this.exec = exec;
-        zk = new ZooKeeper(hostPort, 3000, this);
-        dm = new DataMonitor(zk, znode, null, this);
-    }
-
-    public void run() {
-        try {
-            synchronized (this) {
-                while (!dm.dead) {
-                    wait();
-                }
-            }
-        } catch (InterruptedException e) {
-        }
-    }
-</pre>
-<p>
-    Recall that the Executor's job is to start and stop the executable whose name you pass in on the command line. 
-    It does this in response to events fired by the ZooKeeper object. As you can see in the code above, the Executor passes
-    a reference to itself as the Watcher argument in the ZooKeeper constructor. It also passes a reference to itself
-    as DataMonitorListener argument to the DataMonitor constructor. Per the Executor's definition, it implements both these
-    interfaces:
-    </p>
-<pre class="code">
-public class Executor implements Watcher, Runnable, DataMonitor.DataMonitorListener {
-...</pre>
-<p>The <strong>Watcher</strong> interface is defined by the ZooKeeper Java API.
-    ZooKeeper uses it to communicate back to its container. It supports only one method, <span class="codefrag command">process()</span>, and ZooKeeper uses 
-    it to communciates generic events that the main thread would be intersted in, such as the state of the ZooKeeper connection or the ZooKeeper session.The Executor 
-    in this example simply forwards those events down to the DataMonitor to decide what to do with them. It does this simply to illustrate
-    the point that, by convention, the Executor or some Executor-like object "owns" the ZooKeeper connection, but it is free to delegate the events to other
-    events to other objects. It also uses this as the default channel on which to fire watch events. (More on this later.)</p>
-<pre class="code">
-    public void process(WatchedEvent event) {
-        dm.process(event);
-    }
-</pre>
-<p>The <strong>DataMonitorListener</strong> 
-    interface, on the other hand, is not part of the the ZooKeeper API. It is a completely custom interface, 
-    designed for this sample application. The DataMonitor object uses it to communicate back to its container, which
-    is also the the Executor object.The DataMonitorListener interface looks like this:</p>
-<pre class="code">
-public interface DataMonitorListener {
-    /**
-    * The existence status of the node has changed.
-    */
-    void exists(byte data[]);
-
-    /**
-    * The ZooKeeper session is no longer valid.
-    * 
-    * @param rc
-    * the ZooKeeper reason code
-    */
-    void closing(int rc);
-}
-</pre>
-<p>This interface is defined in the DataMonitor class and implemented in the Executor class. 
-    When <span class="codefrag command">Executor.exists()</span> is invoked,
-    the Executor decides whether to start up or shut down per the requirements. Recall that the requires say to kill the executable when the 
-    znode ceases to <em>exist</em>. </p>
-<p>When <span class="codefrag command">Executor.closing()</span>
-    is invoked, the Executor decides whether or not to shut itself down in response to the ZooKeeper connection permanently disappearing.</p>
-<p>As you might have guessed, DataMonitor is the object that invokes 
-    these methods, in response to changes in ZooKeeper's state.</p>
-<p>Here are Executor's implementation of 
-    <span class="codefrag command">DataMonitorListener.exists()</span> and <span class="codefrag command">DataMonitorListener.closing</span>:
-    </p>
-<pre class="code">
-public void exists( byte[] data ) {
-    if (data == null) {
-        if (child != null) {
-            System.out.println("Killing process");
-            child.destroy();
-            try {
-                child.waitFor();
-            } catch (InterruptedException e) {
-            }
-        }
-        child = null;
-    } else {
-        if (child != null) {
-            System.out.println("Stopping child");
-            child.destroy();
-            try {
-               child.waitFor();
-            } catch (InterruptedException e) {
-            e.printStackTrace();
-            }
-        }
-        try {
-            FileOutputStream fos = new FileOutputStream(filename);
-            fos.write(data);
-            fos.close();
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-        try {
-            System.out.println("Starting child");
-            child = Runtime.getRuntime().exec(exec);
-            new StreamWriter(child.getInputStream(), System.out);
-            new StreamWriter(child.getErrorStream(), System.err);
-        } catch (IOException e) {
-            e.printStackTrace();
-        }
-    }
-}
-
-public void closing(int rc) {
-    synchronized (this) {
-        notifyAll();
-    }
-}
-</pre>
-</div>
-
-<a name="sc_DataMonitor"></a>
-<h2 class="h3">The DataMonitor Class</h2>
-<div class="section">
-<p>
-The DataMonitor class has the meat of the ZooKeeper logic. It is mostly 
-asynchronous and event driven. DataMonitor kicks things off in the constructor with:</p>
-<pre class="code">
-public DataMonitor(ZooKeeper zk, String znode, Watcher chainedWatcher,
-        DataMonitorListener listener) {
-    this.zk = zk;
-    this.znode = znode;
-    this.chainedWatcher = chainedWatcher;
-    this.listener = listener;
-    
-    // Get things started by checking if the node exists. We are going
-    // to be completely event driven
-    <strong>zk.exists(znode, true, this, null);</strong>
-}
-</pre>
-<p>The call to <span class="codefrag command">ZooKeeper.exists()</span> checks for the existence of the znode, 
-sets a watch, and passes a reference to itself (<span class="codefrag command">this</span>)
-as the completion callback object. In this sense, it kicks things off, since the
-real processing happens when the watch is triggered.</p>
-<div class="note">
-<div class="label">Note</div>
-<div class="content">
-
-<p>Don't confuse the completion callback with the watch callback. The <span class="codefrag command">ZooKeeper.exists()</span> 
-completion callback, which happens to be the method <span class="codefrag command">StatCallback.processResult()</span> implemented 
-in the DataMonitor object, is invoked when the asynchronous <em>setting of the watch</em> operation 
-(by <span class="codefrag command">ZooKeeper.exists()</span>) completes on the server. </p>
-
-<p>
-The triggering of the watch, on the other hand, sends an event to the <em>Executor</em> object, since
-the Executor registered as the Watcher of the ZooKeeper object.</p>
-
-
-<p>As an aside, you might note that the DataMonitor could also register itself as the Watcher
-for this particular watch event. This is new to ZooKeeper 3.0.0 (the support of multiple Watchers). In this
-example, however, DataMonitor does not register as the Watcher.</p>
-
-</div>
-</div>
-<p>When the <span class="codefrag command">ZooKeeper.exists()</span> operation completes on the server, the ZooKeeper API invokes this completion callback on 
-the client:</p>
-<pre class="code">
-public void processResult(int rc, String path, Object ctx, Stat stat) {
-    boolean exists;
-    switch (rc) {
-    case Code.Ok:
-        exists = true;
-        break;
-    case Code.NoNode:
-        exists = false;
-        break;
-    case Code.SessionExpired:
-    case Code.NoAuth:
-        dead = true;
-        listener.closing(rc);
-        return;
-    default:
-        // Retry errors
-        zk.exists(znode, true, this, null);
-        return;
-    }
- 
-    byte b[] = null;
-    if (exists) {
-        try {
-            <strong>b = zk.getData(znode, false, null);</strong>
-        } catch (KeeperException e) {
-            // We don't need to worry about recovering now. The watch
-            // callbacks will kick off any exception handling
-            e.printStackTrace();
-        } catch (InterruptedException e) {
-            return;
-        }
-    }     
-    if ((b == null &amp;&amp; b != prevData)
-            || (b != null &amp;&amp; !Arrays.equals(prevData, b))) {
-        <strong>listener.exists(b);</strong>
-        prevData = b;
-    }
-}
-</pre>
-<p>
-The code first checks the error codes for znode existence, fatal errors, and 
-recoverable errors. If the file (or znode) exists, it gets the data from the znode, and 
-then invoke the exists() callback of Executor if the state has changed. Note, 
-it doesn't have to do any Exception processing for the getData call because it 
-has watches pending for anything that could cause an error: if the node is deleted 
-before it calls <span class="codefrag command">ZooKeeper.getData()</span>, the watch event set by 
-the <span class="codefrag command">ZooKeeper.exists()</span> triggers a callback; 
-if there is a communication error, a connection watch event fires when 
-the connection comes back up.
-</p>
-<p>Finally, notice how DataMonitor processes watch events: </p>
-<pre class="code">
-    public void process(WatchedEvent event) {
-        String path = event.getPath();
-        if (event.getType() == Event.EventType.None) {
-            // We are are being told that the state of the
-            // connection has changed
-            switch (event.getState()) {
-            case SyncConnected:
-                // In this particular example we don't need to do anything
-                // here - watches are automatically re-registered with 
-                // server and any watches triggered while the client was 
-                // disconnected will be delivered (in order of course)
-                break;
-            case Expired:
-                // It's all over
-                dead = true;
-                listener.closing(KeeperException.Code.SessionExpired);
-                break;
-            }
-        } else {
-            if (path != null &amp;&amp; path.equals(znode)) {
-                // Something has changed on the node, let's find out
-                zk.exists(znode, true, this, null);
-            }
-        }
-        if (chainedWatcher != null) {
-            chainedWatcher.process(event);
-        }
-    }
-</pre>
-<p>
-If the client-side ZooKeeper libraries can re-establish the
-communication channel (SyncConnected event) to ZooKeeper before
-session expiration (Expired event) all of the session's watches will
-automatically be re-established with the server (auto-reset of watches
-is new in ZooKeeper 3.0.0). See <a href="zookeeperProgrammers.html#ch_zkWatches">ZooKeeper Watches</a>
-in the programmer guide for more on this. A bit lower down in this
-function, when DataMonitor gets an event for a znode, it calls
-<span class="codefrag command">ZooKeeper.exists()</span> to find out what has changed.
-</p>
-</div>
-
-
-<a name="sc_completeSourceCode"></a>
-<h2 class="h3">Complete Source Listings</h2>
-<div class="section">
-<div class="note example">
-<div class="label">Executor.java</div>
-<div class="content">
-<title>Executor.java</title>
-<pre class="code">
-/**
- * A simple example program to use DataMonitor to start and
- * stop executables based on a znode. The program watches the
- * specified znode and saves the data that corresponds to the
- * znode in the filesystem. It also starts the specified program
- * with the specified arguments when the znode exists and kills
- * the program if the znode goes away.
- */
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-
-import org.apache.zookeeper.KeeperException;
-import org.apache.zookeeper.WatchedEvent;
-import org.apache.zookeeper.Watcher;
-import org.apache.zookeeper.ZooKeeper;
-
-public class Executor
-    implements Watcher, Runnable, DataMonitor.DataMonitorListener
-{
-    String znode;
-
-    DataMonitor dm;
-
-    ZooKeeper zk;
-
-    String filename;
-
-    String exec[];
-
-    Process child;
-
-    public Executor(String hostPort, String znode, String filename,
-            String exec[]) throws KeeperException, IOException {
-        this.filename = filename;
-        this.exec = exec;
-        zk = new ZooKeeper(hostPort, 3000, this);
-        dm = new DataMonitor(zk, znode, null, this);
-    }
-
-    /**
-     * @param args
-     */
-    public static void main(String[] args) {
-        if (args.length &lt; 4) {
-            System.err
-                    .println("USAGE: Executor hostPort znode filename program [args ...]");
-            System.exit(2);
-        }
-        String hostPort = args[0];
-        String znode = args[1];
-        String filename = args[2];
-        String exec[] = new String[args.length - 3];
-        System.arraycopy(args, 3, exec, 0, exec.length);
-        try {
-            new Executor(hostPort, znode, filename, exec).run();
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-    }
-
-    /***************************************************************************
-     * We do process any events ourselves, we just need to forward them on.
-     *
-     * @see org.apache.zookeeper.Watcher#process(org.apache.zookeeper.proto.WatcherEvent)
-     */
-    public void process(WatchedEvent event) {
-        dm.process(event);
-    }
-
-    public void run() {
-        try {
-            synchronized (this) {
-                while (!dm.dead) {
-                    wait();
-                }
-            }
-        } catch (InterruptedException e) {
-        }
-    }
-
-    public void closing(int rc) {
-        synchronized (this) {
-            notifyAll();
-        }
-    }
-
-    static class StreamWriter extends Thread {
-        OutputStream os;
-
-        InputStream is;
-
-        StreamWriter(InputStream is, OutputStream os) {
-            this.is = is;
-            this.os = os;
-            start();
-        }
-
-        public void run() {
-            byte b[] = new byte[80];
-            int rc;
-            try {
-                while ((rc = is.read(b)) &gt; 0) {
-                    os.write(b, 0, rc);
-                }
-            } catch (IOException e) {
-            }
-
-        }
-    }
-
-    public void exists(byte[] data) {
-        if (data == null) {
-            if (child != null) {
-                System.out.println("Killing process");
-                child.destroy();
-                try {
-                    child.waitFor();
-                } catch (InterruptedException e) {
-                }
-            }
-            child = null;
-        } else {
-            if (child != null) {
-                System.out.println("Stopping child");
-                child.destroy();
-                try {
-                    child.waitFor();
-                } catch (InterruptedException e) {
-                    e.printStackTrace();
-                }
-            }
-            try {
-                FileOutputStream fos = new FileOutputStream(filename);
-                fos.write(data);
-                fos.close();
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-            try {
-                System.out.println("Starting child");
-                child = Runtime.getRuntime().exec(exec);
-                new StreamWriter(child.getInputStream(), System.out);
-                new StreamWriter(child.getErrorStream(), System.err);
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-    }
-}
-</pre>
-	
-
-</div>
-</div>
-<div class="note example">
-<div class="label">DataMonitor.java</div>
-<div class="content">
-	
-<title>DataMonitor.java</title>
-	
-<pre class="code">
-/**
- * A simple class that monitors the data and existence of a ZooKeeper
- * node. It uses asynchronous ZooKeeper APIs.
- */
-import java.util.Arrays;
-
-import org.apache.zookeeper.KeeperException;
-import org.apache.zookeeper.WatchedEvent;
-import org.apache.zookeeper.Watcher;
-import org.apache.zookeeper.ZooKeeper;
-import org.apache.zookeeper.AsyncCallback.StatCallback;
-import org.apache.zookeeper.KeeperException.Code;
-import org.apache.zookeeper.data.Stat;
-
-public class DataMonitor implements Watcher, StatCallback {
-
-    ZooKeeper zk;
-
-    String znode;
-
-    Watcher chainedWatcher;
-
-    boolean dead;
-
-    DataMonitorListener listener;
-
-    byte prevData[];
-
-    public DataMonitor(ZooKeeper zk, String znode, Watcher chainedWatcher,
-            DataMonitorListener listener) {
-        this.zk = zk;
-        this.znode = znode;
-        this.chainedWatcher = chainedWatcher;
-        this.listener = listener;
-        // Get things started by checking if the node exists. We are going
-        // to be completely event driven
-        zk.exists(znode, true, this, null);
-    }
-
-    /**
-     * Other classes use the DataMonitor by implementing this method
-     */
-    public interface DataMonitorListener {
-        /**
-         * The existence status of the node has changed.
-         */
-        void exists(byte data[]);
-
-        /**
-         * The ZooKeeper session is no longer valid.
-         *
-         * @param rc
-         *                the ZooKeeper reason code
-         */
-        void closing(int rc);
-    }
-
-    public void process(WatchedEvent event) {
-        String path = event.getPath();
-        if (event.getType() == Event.EventType.None) {
-            // We are are being told that the state of the
-            // connection has changed
-            switch (event.getState()) {
-            case SyncConnected:
-                // In this particular example we don't need to do anything
-                // here - watches are automatically re-registered with 
-                // server and any watches triggered while the client was 
-                // disconnected will be delivered (in order of course)
-                break;
-            case Expired:
-                // It's all over
-                dead = true;
-                listener.closing(KeeperException.Code.SessionExpired);
-                break;
-            }
-        } else {
-            if (path != null &amp;&amp; path.equals(znode)) {
-                // Something has changed on the node, let's find out
-                zk.exists(znode, true, this, null);
-            }
-        }
-        if (chainedWatcher != null) {
-            chainedWatcher.process(event);
-        }
-    }
-
-    public void processResult(int rc, String path, Object ctx, Stat stat) {
-        boolean exists;
-        switch (rc) {
-        case Code.Ok:
-            exists = true;
-            break;
-        case Code.NoNode:
-            exists = false;
-            break;
-        case Code.SessionExpired:
-        case Code.NoAuth:
-            dead = true;
-            listener.closing(rc);
-            return;
-        default:
-            // Retry errors
-            zk.exists(znode, true, this, null);
-            return;
-        }
-
-        byte b[] = null;
-        if (exists) {
-            try {
-                b = zk.getData(znode, false, null);
-            } catch (KeeperException e) {
-                // We don't need to worry about recovering now. The watch
-                // callbacks will kick off any exception handling
-                e.printStackTrace();
-            } catch (InterruptedException e) {
-                return;
-            }
-        }
-        if ((b == null &amp;&amp; b != prevData)
-                || (b != null &amp;&amp; !Arrays.equals(prevData, b))) {
-            listener.exists(b);
-            prevData = b;
-        }
-    }
-}
-</pre>
-
-</div>
-</div>
-</div>
-
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-<a href="zookeeperTutorial.html">Barrier and Queue Tutorial</a>&nbsp;&nbsp;___________________&nbsp;&nbsp;<em>barTutor</em>
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-<a href="zookeeperQuotas.html">Quota Guide</a>&nbsp;&nbsp;___________________&nbsp;&nbsp;<em>quota</em>
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-<a href="zookeeperJMX.html">JMX</a>&nbsp;&nbsp;___________________&nbsp;&nbsp;<em>jmx</em>
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-<a href="zookeeperObservers.html">Observers Guide</a>&nbsp;&nbsp;___________________&nbsp;&nbsp;<em>observers</em>
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-<a href="zookeeperReconfig.html">Dynamic Reconfiguration</a>&nbsp;&nbsp;___________________&nbsp;&nbsp;<em>reconfig</em>
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-<a>Contributor</a>&nbsp;&nbsp;___________________&nbsp;&nbsp;<em>docs</em>
-</li>
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-<a href="zookeeperInternals.html">ZooKeeper Internals</a>&nbsp;&nbsp;___________________&nbsp;&nbsp;<em>internals</em>
-</li>
-</ul>
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-<a>Miscellaneous</a>&nbsp;&nbsp;___________________&nbsp;&nbsp;<em>docs</em>
-</li>
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-<a href="https://cwiki.apache.org/confluence/display/ZOOKEEPER">Wiki</a>&nbsp;&nbsp;___________________&nbsp;&nbsp;<em>wiki</em>
-</li>
-</ul>
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-<li>
-<a href="https://cwiki.apache.org/confluence/display/ZOOKEEPER/FAQ">FAQ</a>&nbsp;&nbsp;___________________&nbsp;&nbsp;<em>faq</em>
-</li>
-</ul>
-    
-<ul>
-<li>
-<a href="http://zookeeper.apache.org/mailing_lists.html">Mailing Lists</a>&nbsp;&nbsp;___________________&nbsp;&nbsp;<em>lists</em>
-</li>
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http://git-wip-us.apache.org/repos/asf/zookeeper/blob/ab59048a/docs/linkmap.pdf
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