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Posted to commits@zookeeper.apache.org by bu...@apache.org on 2014/03/13 17:58:02 UTC
svn commit: r901459 [25/39] - in /websites/staging/zookeeper/trunk/content:
./ bookkeeper/docs/trunk/ doc/r3.4.6/ doc/r3.4.6/api/ doc/r3.4.6/api/org/
doc/r3.4.6/api/org/apache/ doc/r3.4.6/api/org/apache/zookeeper/
doc/r3.4.6/api/org/apache/zookeeper/cl...
Added: websites/staging/zookeeper/trunk/content/doc/r3.4.6/api/overview-tree.html
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--- websites/staging/zookeeper/trunk/content/doc/r3.4.6/api/overview-tree.html (added)
+++ websites/staging/zookeeper/trunk/content/doc/r3.4.6/api/overview-tree.html Thu Mar 13 16:57:55 2014
@@ -0,0 +1,219 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<!-- NewPage -->
+<html lang="en">
+<head>
+<!-- Generated by javadoc (version 1.7.0_51) on Thu Feb 20 10:14:20 GMT 2014 -->
+<title>Class Hierarchy (ZooKeeper 3.4.6 API)</title>
+<meta name="date" content="2014-02-20">
+<link rel="stylesheet" type="text/css" href="stylesheet.css" title="Style">
+</head>
+<body>
+<script type="text/javascript"><!--
+ if (location.href.indexOf('is-external=true') == -1) {
+ parent.document.title="Class Hierarchy (ZooKeeper 3.4.6 API)";
+ }
+//-->
+</script>
+<noscript>
+<div>JavaScript is disabled on your browser.</div>
+</noscript>
+<!-- ========= START OF TOP NAVBAR ======= -->
+<div class="topNav"><a name="navbar_top">
+<!-- -->
+</a><a href="#skip-navbar_top" title="Skip navigation links"></a><a name="navbar_top_firstrow">
+<!-- -->
+</a>
+<ul class="navList" title="Navigation">
+<li><a href="overview-summary.html">Overview</a></li>
+<li>Package</li>
+<li>Class</li>
+<li>Use</li>
+<li class="navBarCell1Rev">Tree</li>
+<li><a href="deprecated-list.html">Deprecated</a></li>
+<li><a href="index-all.html">Index</a></li>
+<li><a href="help-doc.html">Help</a></li>
+</ul>
+</div>
+<div class="subNav">
+<ul class="navList">
+<li>Prev</li>
+<li>Next</li>
+</ul>
+<ul class="navList">
+<li><a href="index.html?overview-tree.html" target="_top">Frames</a></li>
+<li><a href="overview-tree.html" target="_top">No Frames</a></li>
+</ul>
+<ul class="navList" id="allclasses_navbar_top">
+<li><a href="allclasses-noframe.html">All Classes</a></li>
+</ul>
+<div>
+<script type="text/javascript"><!--
+ allClassesLink = document.getElementById("allclasses_navbar_top");
+ if(window==top) {
+ allClassesLink.style.display = "block";
+ }
+ else {
+ allClassesLink.style.display = "none";
+ }
+ //-->
+</script>
+</div>
+<a name="skip-navbar_top">
+<!-- -->
+</a></div>
+<!-- ========= END OF TOP NAVBAR ========= -->
+<div class="header">
+<h1 class="title">Hierarchy For All Packages</h1>
+<span class="strong">Package Hierarchies:</span>
+<ul class="horizontal">
+<li><a href="org/apache/zookeeper/package-tree.html">org.apache.zookeeper</a>, </li>
+<li><a href="org/apache/zookeeper/client/package-tree.html">org.apache.zookeeper.client</a>, </li>
+<li><a href="org/apache/zookeeper/data/package-tree.html">org.apache.zookeeper.data</a>, </li>
+<li><a href="org/apache/zookeeper/server/package-tree.html">org.apache.zookeeper.server</a>, </li>
+<li><a href="org/apache/zookeeper/server/quorum/package-tree.html">org.apache.zookeeper.server.quorum</a>, </li>
+<li><a href="org/apache/zookeeper/server/upgrade/package-tree.html">org.apache.zookeeper.server.upgrade</a></li>
+</ul>
+</div>
+<div class="contentContainer">
+<h2 title="Class Hierarchy">Class Hierarchy</h2>
+<ul>
+<li type="circle">java.lang.<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang"><span class="strong">Object</span></a>
+<ul>
+<li type="circle">org.apache.zookeeper.data.<a href="org/apache/zookeeper/data/ACL.html" title="class in org.apache.zookeeper.data"><span class="strong">ACL</span></a> (implements org.apache.jute.Record)</li>
+<li type="circle">org.apache.zookeeper.client.<a href="org/apache/zookeeper/client/FourLetterWordMain.html" title="class in org.apache.zookeeper.client"><span class="strong">FourLetterWordMain</span></a></li>
+<li type="circle">org.apache.zookeeper.data.<a href="org/apache/zookeeper/data/Id.html" title="class in org.apache.zookeeper.data"><span class="strong">Id</span></a> (implements org.apache.jute.Record)</li>
+<li type="circle">org.apache.zookeeper.server.<a href="org/apache/zookeeper/server/LogFormatter.html" title="class in org.apache.zookeeper.server"><span class="strong">LogFormatter</span></a></li>
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+<ul>
+<li type="circle">java.lang.<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang"><span class="strong">Exception</span></a>
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+<li type="circle">org.apache.zookeeper.<a href="org/apache/zookeeper/KeeperException.html" title="class in org.apache.zookeeper"><span class="strong">KeeperException</span></a>
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+<li type="circle">org.apache.zookeeper.<a href="org/apache/zookeeper/WatchedEvent.html" title="class in org.apache.zookeeper"><span class="strong">WatchedEvent</span></a></li>
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+<li type="circle">org.apache.zookeeper.<a href="org/apache/zookeeper/ZooKeeper.html" title="class in org.apache.zookeeper"><span class="strong">ZooKeeper</span></a></li>
+<li type="circle">org.apache.zookeeper.<a href="org/apache/zookeeper/ZooKeeperMain.html" title="class in org.apache.zookeeper"><span class="strong">ZooKeeperMain</span></a></li>
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+</ul>
+</li>
+</ul>
+<h2 title="Interface Hierarchy">Interface Hierarchy</h2>
+<ul>
+<li type="circle">org.apache.zookeeper.<a href="org/apache/zookeeper/AsyncCallback.html" title="interface in org.apache.zookeeper"><span class="strong">AsyncCallback</span></a>
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+<li type="circle">org.apache.zookeeper.<a href="org/apache/zookeeper/KeeperException.CodeDeprecated.html" title="interface in org.apache.zookeeper"><span class="strong">KeeperException.CodeDeprecated</span></a></li>
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+<ul>
+<li type="circle">java.lang.<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang"><span class="strong">Object</span></a>
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+</li>
+</ul>
+</li>
+</ul>
+</div>
+<!-- ======= START OF BOTTOM NAVBAR ====== -->
+<div class="bottomNav"><a name="navbar_bottom">
+<!-- -->
+</a><a href="#skip-navbar_bottom" title="Skip navigation links"></a><a name="navbar_bottom_firstrow">
+<!-- -->
+</a>
+<ul class="navList" title="Navigation">
+<li><a href="overview-summary.html">Overview</a></li>
+<li>Package</li>
+<li>Class</li>
+<li>Use</li>
+<li class="navBarCell1Rev">Tree</li>
+<li><a href="deprecated-list.html">Deprecated</a></li>
+<li><a href="index-all.html">Index</a></li>
+<li><a href="help-doc.html">Help</a></li>
+</ul>
+</div>
+<div class="subNav">
+<ul class="navList">
+<li>Prev</li>
+<li>Next</li>
+</ul>
+<ul class="navList">
+<li><a href="index.html?overview-tree.html" target="_top">Frames</a></li>
+<li><a href="overview-tree.html" target="_top">No Frames</a></li>
+</ul>
+<ul class="navList" id="allclasses_navbar_bottom">
+<li><a href="allclasses-noframe.html">All Classes</a></li>
+</ul>
+<div>
+<script type="text/javascript"><!--
+ allClassesLink = document.getElementById("allclasses_navbar_bottom");
+ if(window==top) {
+ allClassesLink.style.display = "block";
+ }
+ else {
+ allClassesLink.style.display = "none";
+ }
+ //-->
+</script>
+</div>
+<a name="skip-navbar_bottom">
+<!-- -->
+</a></div>
+<!-- ======== END OF BOTTOM NAVBAR ======= -->
+<p class="legalCopy"><small>Copyright © 2014 The Apache Software Foundation</small></p>
+</body>
+</html>
Added: websites/staging/zookeeper/trunk/content/doc/r3.4.6/api/package-list
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--- websites/staging/zookeeper/trunk/content/doc/r3.4.6/api/package-list (added)
+++ websites/staging/zookeeper/trunk/content/doc/r3.4.6/api/package-list Thu Mar 13 16:57:55 2014
@@ -0,0 +1,6 @@
+org.apache.zookeeper
+org.apache.zookeeper.client
+org.apache.zookeeper.data
+org.apache.zookeeper.server
+org.apache.zookeeper.server.quorum
+org.apache.zookeeper.server.upgrade
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--- websites/staging/zookeeper/trunk/content/doc/r3.4.6/api/serialized-form.html (added)
+++ websites/staging/zookeeper/trunk/content/doc/r3.4.6/api/serialized-form.html Thu Mar 13 16:57:55 2014
@@ -0,0 +1,329 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<!-- NewPage -->
+<html lang="en">
+<head>
+<!-- Generated by javadoc (version 1.7.0_51) on Thu Feb 20 10:14:20 GMT 2014 -->
+<title>Serialized Form (ZooKeeper 3.4.6 API)</title>
+<meta name="date" content="2014-02-20">
+<link rel="stylesheet" type="text/css" href="stylesheet.css" title="Style">
+</head>
+<body>
+<script type="text/javascript"><!--
+ if (location.href.indexOf('is-external=true') == -1) {
+ parent.document.title="Serialized Form (ZooKeeper 3.4.6 API)";
+ }
+//-->
+</script>
+<noscript>
+<div>JavaScript is disabled on your browser.</div>
+</noscript>
+<!-- ========= START OF TOP NAVBAR ======= -->
+<div class="topNav"><a name="navbar_top">
+<!-- -->
+</a><a href="#skip-navbar_top" title="Skip navigation links"></a><a name="navbar_top_firstrow">
+<!-- -->
+</a>
+<ul class="navList" title="Navigation">
+<li><a href="overview-summary.html">Overview</a></li>
+<li>Package</li>
+<li>Class</li>
+<li>Use</li>
+<li><a href="overview-tree.html">Tree</a></li>
+<li><a href="deprecated-list.html">Deprecated</a></li>
+<li><a href="index-all.html">Index</a></li>
+<li><a href="help-doc.html">Help</a></li>
+</ul>
+</div>
+<div class="subNav">
+<ul class="navList">
+<li>Prev</li>
+<li>Next</li>
+</ul>
+<ul class="navList">
+<li><a href="index.html?serialized-form.html" target="_top">Frames</a></li>
+<li><a href="serialized-form.html" target="_top">No Frames</a></li>
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+<!-- ========= END OF TOP NAVBAR ========= -->
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+<a class="dida" href="bookkeeperConfig.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br>
+ PDF</a>
+</div>
+<h1>BookKeeper Administrator's Guide</h1>
+<h3>Setup Guide</h3>
+<div id="front-matter">
+<div id="minitoc-area">
+<ul class="minitoc">
+<li>
+<a href="#bk_deployment">Deployment</a>
+<ul class="minitoc">
+<li>
+<a href="#bk_sysReq">System requirements</a>
+</li>
+<li>
+<a href="#bk_runningBookies">Running bookies</a>
+</li>
+<li>
+<a href="#bk_zkMetadata">ZooKeeper Metadata</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+
+
+
+
+
+
+<a name="bk_deployment"></a>
+<h2 class="h3">Deployment</h2>
+<div class="section">
+<p>This section contains information about deploying BookKeeper and
+ covers these topics:</p>
+<ul>
+
+<li>
+
+<p>
+<a href="#bk_sysReq">System requirements</a>
+</p>
+
+</li>
+
+
+<li>
+
+<p>
+<a href="#bk_runningBookies">Running bookies</a>
+</p>
+
+</li>
+
+
+<li>
+
+<p>
+<a href="#bk_zkMetadata">ZooKeeper Metadata</a>
+</p>
+
+</li>
+
+</ul>
+<p> The first section tells you how many machines you need. The second explains how to bootstrap bookies
+ (BookKeeper storage servers). The third section explains how we use ZooKeeper and our requirements with
+ respect to ZooKeeper.
+ </p>
+<a name="bk_sysReq"></a>
+<h3 class="h4">System requirements</h3>
+<p> A typical BookKeeper installation comprises a set of bookies and a set of ZooKeeper replicas. The exact number of bookies
+ depends on the quorum mode, desired throughput, and number of clients using this installation simultaneously. The minimum number of
+ bookies is three for self-verifying (stores a message authentication code along with each entry) and four for generic (does not
+ store a message authentication codewith each entry), and there is no upper limit on the number of bookies. Increasing the number of
+ bookies, in fact, enables higher throughput.
+ </p>
+<p> For performance, we require each server to have at least two disks. It is possible to run a bookie with a single disk, but
+ performance will be significantly lower in this case. Of course, it works with one disk, but performance is significantly lower.
+ </p>
+<p> For ZooKeeper, there is no constraint with respect to the number of replicas. Having a single machine running ZooKeeper
+ in standalone mode is sufficient for BookKeeper. For resilience purposes, it might be a good idea to run ZooKeeper in quorum
+ mode with multiple servers. Please refer to the ZooKeeper documentation for detail on how to configure ZooKeeper with multiple
+ replicas
+ </p>
+<a name="bk_runningBookies"></a>
+<h3 class="h4">Running bookies</h3>
+<p>
+ To run a bookie, we execute the following command:
+ </p>
+<p>
+<span class="codefrag computeroutput">
+ java -cp .:./zookeeper-<version>-bookkeeper.jar:./zookeeper-<version>.jar\
+ :../log4j/apache-log4j-1.2.15/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>
+ The parameters are:
+ </p>
+<ul>
+
+<li>
+
+<p>
+ Port number that the bookie listens on;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ Comma separated list of ZooKeeper servers with a hostname:port format;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ Path for Log Device (stores bookie write-ahead log);
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ Path for Ledger Device (stores ledger entries);
+ </p>
+
+</li>
+
+</ul>
+<p>
+ Ideally, <span class="codefrag computeroutput">/path_to_log_device/ </span> and <span class="codefrag computeroutput">/path_to_ledger_device/ </span> are each
+ in a different device.
+ </p>
+<a name="bk_zkMetadata"></a>
+<h3 class="h4">ZooKeeper Metadata</h3>
+<p>
+ For BookKeeper, we require a ZooKeeper installation to store metadata, and to pass the list
+ of ZooKeeper servers as parameter to the constructor of the BookKeeper class (<span class="codefrag computeroutput">
+ org.apache.bookkeeper.client,BookKeeper</span>).
+ To setup ZooKeeper, please check the <a href="index.html">
+ ZooKeeper documentation</a>.
+ </p>
+</div>
+
+<p align="right">
+<font size="-2"></font>
+</p>
+</div>
+<!--+
+ |end content
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+<script type="text/javascript"><!--
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+// --></script>
+</div>
+<div class="copyright">
+ Copyright ©
+ 2008-2013 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
+</div>
+<!--+
+ |end bottomstrip
+ +-->
+</div>
+</body>
+</html>
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+<!--+
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+ PDF</a>
+</div>
+<h1>BookKeeper overview</h1>
+<div id="front-matter">
+<div id="minitoc-area">
+<ul class="minitoc">
+<li>
+<a href="#bk_Overview">BookKeeper overview</a>
+<ul class="minitoc">
+<li>
+<a href="#bk_Intro">BookKeeper introduction</a>
+</li>
+<li>
+<a href="#bk_moreDetail">In slightly more detail...</a>
+</li>
+<li>
+<a href="#bk_basicComponents">Bookkeeper elements and concepts</a>
+</li>
+<li>
+<a href="#bk_initialDesign">Bookkeeper initial design</a>
+</li>
+<li>
+<a href="#bk_metadata">Bookkeeper metadata management</a>
+</li>
+<li>
+<a href="#bk_closingOut">Closing out ledgers</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+
+
+
+<a name="bk_Overview"></a>
+<h2 class="h3">BookKeeper overview</h2>
+<div class="section">
+<a name="bk_Intro"></a>
+<h3 class="h4">BookKeeper introduction</h3>
+<p>
+ BookKeeper is a replicated service to reliably log streams of records. In BookKeeper,
+ servers are "bookies", log streams are "ledgers", and each unit of a log (aka record) is a
+ "ledger entry". BookKeeper is designed to be reliable; bookies, the servers that store
+ ledgers, can crash, corrupt data, discard data, but as long as there are enough bookies
+ behaving correctly the service as a whole behaves correctly.
+ </p>
+<p>
+ The initial motivation for BookKeeper comes from the namenode of HDFS. Namenodes have to
+ log operations in a reliable fashion so that recovery is possible in the case of crashes.
+ We have found the applications for BookKeeper extend far beyond HDFS, however. Essentially,
+ any application that requires an append storage can replace their implementations with
+ BookKeeper. BookKeeper has the advantage of scaling throughput with the number of servers.
+ </p>
+<p>
+ At a high level, a bookkeeper client receives entries from a client application and stores it to
+ sets of bookies, and there are a few advantages in having such a service:
+ </p>
+<ul>
+
+<li>
+
+<p>
+ We can use hardware that is optimized for such a service. We currently believe that such a
+ system has to be optimized only for disk I/O;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ We can have a pool of servers implementing such a log system, and shared among a number of servers;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ We can have a higher degree of replication with such a pool, which makes sense if the hardware necessary for it is cheaper compared to the one the application uses.
+ </p>
+
+</li>
+
+</ul>
+<a name="bk_moreDetail"></a>
+<h3 class="h4">In slightly more detail...</h3>
+<p> BookKeeper implements highly available logs, and it has been designed with write-ahead logging in mind. Besides high availability
+ due to the replicated nature of the service, it provides high throughput due to striping. As we write entries in a subset of bookies of an
+ ensemble and rotate writes across available quorums, we are able to increase throughput with the number of servers for both reads and writes.
+ Scalability is a property that is possible to achieve in this case due to the use of quorums. Other replication techniques, such as
+ state-machine replication, do not enable such a property.
+ </p>
+<p> An application first creates a ledger before writing to bookies through a local BookKeeper client instance.
+ Upon creating a ledger, a BookKeeper client writes metadata about the ledger to ZooKeeper. Each ledger currently
+ has a single writer. This writer has to execute a close ledger operation before any other client can read from it.
+ If the writer of a ledger does not close a ledger properly because, for example, it has crashed before having the
+ opportunity of closing the ledger, then the next client that tries to open a ledger executes a procedure to recover
+ it. As closing a ledger consists essentially of writing the last entry written to a ledger to ZooKeeper, the recovery
+ procedure simply finds the last entry written correctly and writes it to ZooKeeper.
+ </p>
+<p>
+ Note that currently this recovery procedure is executed automatically upon trying to open a ledger and no explicit action is necessary.
+ Although two clients may try to recover a ledger concurrently, only one will succeed, the first one that is able to create the close znode
+ for the ledger.
+ </p>
+<a name="bk_basicComponents"></a>
+<h3 class="h4">Bookkeeper elements and concepts</h3>
+<p>
+ BookKeeper uses four basic elements:
+ </p>
+<ul>
+
+<li>
+
+<p>
+
+<strong>Ledger</strong>: A ledger is a sequence of entries, and each entry is a sequence of bytes. Entries are
+ written sequentially to a ledger and at most once. Consequently, ledgers have an append-only semantics;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+
+<strong>BookKeeper client</strong>: A client runs along with a BookKeeper application, and it enables applications
+ to execute operations on ledgers, such as creating a ledger and writing to it;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+
+<strong>Bookie</strong>: A bookie is a BookKeeper storage server. Bookies store the content of ledgers. For any given
+ ledger L, we call an <em>ensemble</em> the group of bookies storing the content of L. For performance, we store on
+ each bookie of an ensemble only a fragment of a ledger. That is, we stripe when writing entries to a ledger such that
+ each entry is written to sub-group of bookies of the ensemble.
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+
+<strong>Metadata storage service</strong>: BookKeeper requires a metadata storage service to store information related
+ to ledgers and available bookies. We currently use ZooKeeper for such a task.
+ </p>
+
+</li>
+
+</ul>
+<a name="bk_initialDesign"></a>
+<h3 class="h4">Bookkeeper initial design</h3>
+<p>
+ A set of bookies implements BookKeeper, and we use a quorum-based protocol to replicate data across the bookies.
+ There are basically two operations to an existing ledger: read and append. Here is the complete API list
+ (mode detail <a href="bookkeeperProgrammer.html">
+ here</a>):
+ </p>
+<ul>
+
+<li>
+
+<p>
+ Create ledger: creates a new empty ledger;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ Open ledger: opens an existing ledger for reading;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ Add entry: adds a record to a ledger either synchronously or asynchronously;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ Read entries: reads a sequence of entries from a ledger either synchronously or asynchronously
+ </p>
+
+</li>
+
+</ul>
+<p>
+ There is only a single client that can write to a ledger. Once that ledger is closed or the client fails,
+ no more entries can be added. (We take advantage of this behavior to provide our strong guarantees.)
+ There will not be gaps in the ledger. Fingers get broken, people get roughed up or end up in prison when
+ books are manipulated, so there is no deleting or changing of entries.
+ </p>
+<table class="ForrestTable" cellspacing="1" cellpadding="4">
+<tr>
+<td>BookKeeper Overview</td>
+</tr>
+<tr>
+<td>
+
+ <img alt="" src="images/bk-overview.jpg">
+
+ </td>
+</tr>
+</table>
+<p>
+ A simple use of BooKeeper is to implement a write-ahead transaction log. A server maintains an in-memory data structure
+ (with periodic snapshots for example) and logs changes to that structure before it applies the change. The application
+ server creates a ledger at startup and store the ledger id and password in a well known place (ZooKeeper maybe). When
+ it needs to make a change, the server adds an entry with the change information to a ledger and apply the change when
+ BookKeeper adds the entry successfully. The server can even use asyncAddEntry to queue up many changes for high change
+ throughput. BooKeeper meticulously logs the changes in order and call the completion functions in order.
+ </p>
+<p>
+ When the application server dies, a backup server will come online, get the last snapshot and then it will open the
+ ledger of the old server and read all the entries from the time the snapshot was taken. (Since it doesn't know the
+ last entry number it will use MAX_INTEGER). Once all the entries have been processed, it will close the ledger and
+ start a new one for its use.
+ </p>
+<p>
+ A client library takes care of communicating with bookies and managing entry numbers. An entry has the following fields:
+ </p>
+<table class="ForrestTable" cellspacing="1" cellpadding="4">
+<caption>Entry fields</caption>
+<title>Entry fields</title>
+
+
+<tr>
+
+<th>Field</th>
+ <th>Type</th>
+ <th>Description</th>
+
+</tr>
+
+
+<tr>
+
+<td>Ledger number</td>
+ <td>long</td>
+ <td>The id of the ledger of this entry</td>
+
+</tr>
+
+<tr>
+
+<td>Entry number</td>
+ <td>long</td>
+ <td>The id of this entry</td>
+
+</tr>
+
+
+<tr>
+
+<td>last confirmed (<em>LC</em>)</td>
+ <td>long</td>
+ <td>id of the last recorded entry</td>
+
+</tr>
+
+<tr>
+
+<td>data</td>
+ <td>byte[]</td>
+ <td>the entry data (supplied by application)</td>
+
+</tr>
+
+<tr>
+
+<td>authentication code</td>
+ <td>byte[]</td>
+ <td>Message authentication code that includes all other fields of the entry</td>
+
+</tr>
+
+
+
+</table>
+<p>
+ The client library generates a ledger entry. None of the fields are modified by the bookies and only the first three
+ fields are interpreted by the bookies.
+ </p>
+<p>
+ To add to a ledger, the client generates the entry above using the ledger number. The entry number will be one more
+ than the last entry generated. The <em>LC</em> field contains the last entry that has been successfully recorded by BookKeeper.
+ If the client writes entries one at a time, <em>LC</em> is the last entry id. But, if the client is using asyncAddEntry, there
+ may be many entries in flight. An entry is considered recorded when both of the following conditions are met:
+ </p>
+<ul>
+
+<li>
+
+<p>
+ the entry has been accepted by a quorum of bookies
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ all entries with a lower entry id have been accepted by a quorum of bookies
+ </p>
+
+</li>
+
+</ul>
+<p>
+
+<em>LC</em> seems mysterious right now, but it is too early to explain how we use it; just smile and move on.
+ </p>
+<p>
+ Once all the other fields have been field in, the client generates an authentication code with all of the previous fields.
+ The entry is then sent to a quorum of bookies to be recorded. Any failures will result in the entry being sent to a new
+ quorum of bookies.
+ </p>
+<p>
+ To read, the client library initially contacts a bookie and starts requesting entries. If an entry is missing or
+ invalid (a bad MAC for example), the client will make a request to a different bookie. By using quorum writes,
+ as long as enough bookies are up we are guaranteed to eventually be able to read an entry.
+ </p>
+<a name="bk_metadata"></a>
+<h3 class="h4">Bookkeeper metadata management</h3>
+<p>
+ There are some meta data that needs to be made available to BookKeeper clients:
+ </p>
+<ul>
+
+<li>
+
+<p>
+ The available bookies;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ The list of ledgers;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ The list of bookies that have been used for a given ledger;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ The last entry of a ledger;
+ </p>
+
+</li>
+
+</ul>
+<p>
+ We maintain this information in ZooKeeper. Bookies use ephemeral nodes to indicate their availability. Clients
+ use znodes to track ledger creation and deletion and also to know the end of the ledger and the bookies that
+ were used to store the ledger. Bookies also watch the ledger list so that they can cleanup ledgers that get deleted.
+ </p>
+<a name="bk_closingOut"></a>
+<h3 class="h4">Closing out ledgers</h3>
+<p>
+ The process of closing out the ledger and finding the last ledger is difficult due to the durability guarantees of BookKeeper:
+ </p>
+<ul>
+
+<li>
+
+<p>
+ If an entry has been successfully recorded, it must be readable.
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ If an entry is read once, it must always be available to be read.
+ </p>
+
+</li>
+
+</ul>
+<p>
+ If the ledger was closed gracefully, ZooKeeper will have the last entry and everything will work well. But, if the
+ BookKeeper client that was writing the ledger dies, there is some recovery that needs to take place.
+ </p>
+<p>
+ The problematic entries are the ones at the end of the ledger. There can be entries in flight when a BookKeeper client
+ dies. If the entry only gets to one bookie, the entry should not be readable since the entry will disappear if that bookie
+ fails. If the entry is only on one bookie, that doesn't mean that the entry has not been recorded successfully; the other
+ bookies that recorded the entry might have failed.
+ </p>
+<p>
+ The trick to making everything work is to have a correct idea of a last entry. We do it in roughly three steps:
+ </p>
+<ol>
+
+<li>
+
+<p>
+ Find the entry with the highest last recorded entry, <em>LC</em>;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ Find the highest consecutively recorded entry, <em>LR</em>;
+ </p>
+
+</li>
+
+
+<li>
+
+<p>
+ Make sure that all entries between <em>LC</em> and <em>LR</em> are on a quorum of bookies;
+ </p>
+
+</li>
+
+
+</ol>
+</div>
+
+<p align="right">
+<font size="-2"></font>
+</p>
+</div>
+<!--+
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