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From conflue...@apache.org
Subject [CONF] Apache Directory Server v1.5: Mitosis Development Guide (page edited)
Date Tue, 06 Jan 2009 22:13:00 GMT
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<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/DIRxSRVx11">DIRxSRVx11</a>
:
            <a href="http://cwiki.apache.org/confluence/display/DIRxSRVx11/Mitosis+Development+Guide">Mitosis
Development Guide</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/DIRxSRVx11/Mitosis+Development+Guide">Mitosis
Development Guide</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~elecharny">Emmanuel
Lécharny</a>
            <span class="smallfont">(Jan 06, 2009)</span>.
     </p>
    <p>
      Change summary:
      <div class="greybox wiki-content"><p>Added a graph about operations hierarchy,
plus CSN and UUID infos</p></div>
    </p>
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=106600&originalVersion=2&revisedVersion=3">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h1><a name="MitosisDevelopmentGuide-Currentimplementation"></a>Current
implementation</h1>

<h2><a name="MitosisDevelopmentGuide-Baseoperations"></a>Base operations</h2>

<p>Replication is meant to transpose a modification done on one server into the associated
servers. We should also insure that a modification done on an entry in more than one server
does not lead to inconsistencies.</p>

<p>As the remote servers may not be available, due to network conditions, we also have
to wait for the synchronization to be done before we can validate a full replication for an
entry. For instance, if we delete an entry on server A, it can be deleted for real only when
all the remote servers has confirmed that the deletion was successful.</p>

<h2><a name="MitosisDevelopmentGuide-CSNandUUID"></a>CSN and UUID</h2>

<p>We will use two tags, stored within each entry, to manage the replication. The <b>CSN</b>
(Change Sequence Number) is used to tell that an entry is owned by a specific server. A replicated
entry on 3 servers will have 3 distinct <b>CSN</b>. The <b>UUID</b>
(Universal Unique Identifier) is associated with an entry, and only one. So if we have an
entry replicated on 3 servers, it will have 3 <b>CSN (one per server) and only one *UUID</b>
(as it's the same entry).</p>


<h2><a name="MitosisDevelopmentGuide-Configuration"></a>Configuration</h2>
<p>The replication system is a Multi-Master replication, ie, each server can update
any server it is connected to. The way you tell a server to replicate to others is simple
: </p>

<div class="code"><div class="codeContent">
<pre class="code-java">&lt;replicationInterceptor&gt;
      &lt;configuration&gt;
        &lt;replicationConfiguration logMaxAge=<span class="code-quote">"5"</span>
                                  replicaId=<span class="code-quote">"instance_a"</span>
                                  replicationInterval=<span class="code-quote">"2"</span>
                                  responseTimeout=<span class="code-quote">"10"</span>
                                  serverPort=<span class="code-quote">"10390"</span>&gt;
          &lt;s:property name=<span class="code-quote">"peerReplicas"</span>&gt;
            &lt;s:set&gt;
              &lt;s:value&gt;instance_b@localhost:1234&lt;/s:value&gt;
              &lt;s:value&gt;instance_c@localhost:1234&lt;/s:value&gt;
            &lt;/s:set&gt;
          &lt;/s:property&gt;
        &lt;/replicationConfiguration&gt;
      &lt;/configuration&gt;
    &lt;/replicationInterceptor&gt;</pre>
</div></div>

<p>Here, for the server <b>instance_a" we have associated two replicas : *instance_b</b>
and <b>instance_c</b>. Basically, you just give the list of remote server you
want to be connected to.</p>

<h2><a name="MitosisDevelopmentGuide-Thereplicationinterceptor"></a>The
replication interceptor</h2>
<p>The MITOSIS service is implemented as an interceptor in the current version (1.5.4).
The following operations are handled :</p>
<ul>
	<li>add</li>
	<li>delete</li>
	<li>hasEntry</li>
	<li>list</li>
	<li>lookup</li>
	<li>modify</li>
	<li>move</li>
	<li>moveAndRename</li>
	<li>rename</li>
	<li>search</li>
</ul>


<h3><a name="MitosisDevelopmentGuide-Operations"></a>Operations</h3>

<p>We are using *Operationµ objects to manage replication inside the interceptor. Here
is the *Operationµ classes hierarchy :</p>

<p><img src="/confluence/download/attachments/106600/replicationOperation.png" align="absmiddle"
border="0" /></p>

<h4><a name="MitosisDevelopmentGuide-Addoperation"></a>Add operation</h4>
<p>It creates a <b>AddEntryOperation</b> object, with a ADD_ENTRY operation
type (how useful is it, considering that we are already defined a specific class for such
an operation ???), an entry and a CSN.</p>

<p>The newly created entry will contain two new AttributeType :</p>
<ul>
	<li>an <b>entryUUID</b> with a newly generated UUID</li>
	<li>an <b>entryDeleted</b> set to <b>FALSE</b></li>
</ul>


<p>If the added entry already exists in the current server, then we should consider
that the entry can't be added. </p>

<table cellpadding='5' width='85%' cellspacing='8px' class='noteMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/warning.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td>
<p>Currently, we check for more than the existence of the entry in the base. Either
the entry is absent, and we can add it, or it's present, and we should discard the new entry,
throwing an error.</p>

<p>Or another option is to consider that the entry has been created on more than one
remote server, and then been created locally. We may have to replace the old entry by the
new one, even if they are different. This is the current implementation.</p></td></tr></table>

<table cellpadding='5' width='85%' cellspacing='8px' class='noteMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/warning.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td>
<p>What if the entry already exists, but with a pending 'deleted' state ? This has to
be checked.</p></td></tr></table>

<table cellpadding='5' width='85%' cellspacing='8px' class='noteMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/warning.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td>
<p>As we may receive a Add request from a remote server - per replication activation
-, we currently create so called <b>glue-entries</b>. There are necessary if we
consider that an entry is added when the underlaying tree is absent. It does not make a lot
of sense either, because the tree have necessarily been created on the remote server, and
the associated created entries have already been transmitted to the local server, thus we
don't have to create a glue entry.</p></td></tr></table>

<h3><a name="MitosisDevelopmentGuide-Deleteoperation"></a>Delete operation</h3>

<p>It creates a <b>CompositeOperation</b> object, which contains a <b>ReplaceAttributeOperation</b>,
as the entry is not deleted, but instead a <b>entryDeleted</b> AttributeType is
added to the entry, and a <b>ReplaceAttributeOperation</b> containing the injection
of a <b>entryCSN</b> AttributeType, with a newly created CSN.</p>

<p>So here are the operation content :</p>
<ul>
	<li>ReplaceAttributeOperation</li>
	<li><b>entryDeleted</b>, value <b>TRUE</b></li>
	<li>ReplaceAttributeOperation</li>
	<li><b>entryCSN</b>, with a new CSN</li>
</ul>


<table cellpadding='5' width='85%' cellspacing='8px' class='noteMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/warning.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td>
<p>The delete operation should be a simple attribute Modification. Currently, two requests
are sent to the backend (one for each added attribute), which is useless.</p></td></tr></table></div>


</td></tr></table></div>
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