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#toc{border:0!important;text-align:left!important;padding:0!important;margin:0!important} body.book #toc,body.book #preamble,body.book h1.sect0,body.book .sect1>h2{page-break-before:always} .listingblock code[data-lang]::before{display:block} #footer{padding:0 .9375em} .hide-on-print{display:none!important} .print-only{display:block!important} .hide-for-print{display:none!important} .show-for-print{display:inherit!important}} @media print,amzn-kf8{#header>h1:first-child{margin-top:1.25rem} .sect1{padding:0!important} .sect1+.sect1{border:0} #footer{background:none} #footer-text{color:rgba(0,0,0,.6);font-size:.9em}} @media amzn-kf8{#header,#content,#footnotes,#footer{padding:0}} </style> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"> </head> <body class="book"> <div id="header"> <h1>SDP Standard for journalPrefix</h1> <div class="details"> <span id="author" class="author">Perforce Professional Services</span><br> <span id="email" class="email"><a href="mailto:consulting@perforce.com">consulting@perforce.com</a></span><br> <span id="revnumber">version v2020.1,</span> <span id="revdate">2020-12-09</span> </div> <div id="toc" class="toc"> <div id="toctitle">Table of Contents</div> <ul class="sectlevel1"> <li><a href="#_preface">Preface</a></li> <li><a href="#_overview">1. Overview</a></li> <li><a href="#_master_metadata_journalprefix_value">2. Master Metadata <code>journalPrefix</code> Value</a> <ul class="sectlevel2"> <li><a href="#_detail_on_completely_unfitered">2.1. Detail on "Completely Unfitered"</a></li> </ul> </li> <li><a href="#_second_form_of_journalprefix_value">3. Second Form of <code>journalPrefix</code> Value</a></li> <li><a href="#_scripts_for_maintaining_the_offline_db">4. Scripts for Maintaining the <code>offline_db</code></a></li> <li><a href="#_sdp_structure_and_journalprefix">5. SDP Structure and <code>journalPrefix</code></a></li> <li><a href="#_goals_of_this_standard">6. Goals of this Standard</a></li> </ul> </div> </div> <div id="content"> <div class="sect1"> <h2 id="_preface">Preface</h2> <div class="sectionbody"> <div class="paragraph"> <p>This document describes the SDP Standard for the <a href="https://www.perforce.com/manuals/cmdref/Content/CmdRef/configurables.configurables.html#journalPrefix">journalPrefix</a> configurable in Perforce Helix Core.</p> </div> <div class="paragraph"> <p>This is related to the <a href="ServerSpecNamingStandard.html">SDP Server Spec Naming Standard</a>.</p> </div> <div class="paragraph"> <p><strong>Please Give Us Feedback</strong></p> </div> <div class="paragraph"> <p>Perforce welcomes feedback from our users. Please send any suggestions for improving this document or the SDP to <a href="mailto:consulting@perforce.com">consulting@perforce.com</a>.</p> </div> </div> </div> <div class="sect1"> <h2 id="_overview">1. Overview</h2> <div class="sectionbody"> <div class="paragraph"> <p>The Perforce Helix configurable <a href="https://www.perforce.com/manuals/cmdref/Content/CmdRef/configurables.configurables.html#journalPrefix"><code>journalPrefix</code></a> determines where the active journal is rotated to when it becomes a numbered journal file during the journal rotation process. It also defines where checkpionts are created. In the SDP structure, the journalPrefix is set so that numbered journals and checkpoints land on the <code>/hxdepots</code> volume. This volume contains critical digital assets that should be reliably backed up should sufficient storage for large digital assets.</p> </div> </div> </div> <div class="sect1"> <h2 id="_master_metadata_journalprefix_value">2. Master Metadata <code>journalPrefix</code> Value</h2> <div class="sectionbody"> <div class="paragraph"> <p>The <code>journalPrefix</code> value used on the master server is of this form, where <code>N</code> is replaced with the SDP instance name:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlight"><code>/p4/N/checkpoints/p4_N</code></pre> </div> </div> <div class="paragraph"> <p>If the SDP instance name is the default <code>1</code>, then files with a <code>p4_1</code> prefix would be stored in the <code>/p4/1/checkpoints</code> directory on the filesytem. Journal files in that directory would have names like <code>p4_1.320.jnl</code> and checkpoints would have names like <code>p4_1.320.ckp.gz</code>.</p> </div> <div class="paragraph"> <p>This <code>journalPrefix</code> value and the corresponding <code>/p4/1/checkpoints</code> directory should be used for the master server. It should also be used for any replica that is a valid failover target for the master server. This includes all <em>completely unfiltered</em> replicas of the master, such as <code>standby</code> and <code>forwarding-standby</code> replicas.</p> </div> <div class="admonitionblock note"> <table> <tr> <td class="icon"> <i class="fa icon-note" title="Note"></i> </td> <td class="content"> A <code>standby</code> replica, also referred to as a <code>journalcopy</code> replica due to the underlying replication mechaninsm, cannot be filtered. It is commonly deployed for High Availability (HA) and/or Disaster Recovery (DR) purposes. </td> </tr> </table> </div> <div class="sect2"> <h3 id="_detail_on_completely_unfitered">2.1. Detail on "Completely Unfitered"</h3> <div class="paragraph"> <p>A "completely unfiltered" replica is one in which:</p> </div> <div class="ulist"> <ul> <li> <p>None of the <code>*DataFilter</code> fields in the replica’s server spec are used</p> </li> <li> <p>The <code>p4 pull</code> command configured to pull metadata from the the replicas P4TARGET server, as defined in the replica’s <code>startup.<em>N</em></code> configurable, does not use filtering options such as <code>-T</code>.</p> </li> <li> <p>The replica is not an Edge server (i.e. one with a <code>Services</code> value in the server spec of <code>edge-server</code>.) Edge servers are filtered by their vary nature, as they exclude various database tables from being replicated.</p> </li> <li> <p>The replica’s seed checkpoint was created without the <code>-P <em>ServerID</em></code> flag to <code>p4d</code>. The <code>-P</code> flag is used when creating seed checkpoints for filtered replicas and edge servers.</p> </li> </ul> </div> <div class="paragraph"> <p>Note that the SDP <code>sync_replica.sh</code> script can be deployed on unfiltered replicas of the master.</p> </div> </div> </div> </div> <div class="sect1"> <h2 id="_second_form_of_journalprefix_value">3. Second Form of <code>journalPrefix</code> Value</h2> <div class="sectionbody"> <div class="paragraph"> <p>A second form of the <code>journalPrefix</code> is used when the replica is filtered, including edge servers. The second form of the <code>journalPrefix</code> value incorporates a shortened form of the <em>ServerID</em> to indicate that the data set is specific to that <em>ServerID</em>. Because the metadata differs from the master, checkpoints for edge servers and filtered replicas are stored in a different directory, and use a prefix that identifies them as separate and divergent from the master’s data set.</p> </div> <div class="admonitionblock note"> <table> <tr> <td class="icon"> <i class="fa icon-note" title="Note"></i> </td> <td class="content"> Filtered replicas are a strict subset of the master server’s metadata. Edge servers filter some database tables from the master, but also have their own indepdent metadata (mainly workspace metadata) that varies from the master server and is potentially larger than the master’s data set for some tables. </td> </tr> </table> </div> <div class="paragraph"> <p>The "shortened form" of the <em>ServerID</em> removes the <code>p4d_</code> prefix (per the <a href="ServerSpecNamingStandard.html">SDP Server Spec Naming Standard</a>. So, for example an edge server with a <em>ServerID</em>` of <code>p4d_edge_uk</code> would use just the <code>edge_uk</code> portion of the <em>ServerID</em> in the <code>journalPrefix</code>, which would look like:</p> </div> <div class="listingblock"> <div class="content"> <pre class="highlight"><code>/p4/N/checkpoints.edge_uk/p4_N.edge_uk</code></pre> </div> </div> </div> </div> <div class="sect1"> <h2 id="_scripts_for_maintaining_the_offline_db">4. Scripts for Maintaining the <code>offline_db</code></h2> <div class="sectionbody"> <div class="paragraph"> <p>The SDP has two scripts for the <code>offline_db</code>, <code>daily_checkpoint.sh</code> and <code>sync_replica.sh</code>.</p> </div> <div class="paragraph"> <p>The <code>daily_checkpoint.sh</code> is used on the master server. When run on the master server, this script rotates the active journal to a numbered journal file, and then maintains the master’s <code>offline_db</code> using the numbered journal file immediately after it is rotated.</p> </div> <div class="paragraph"> <p>The <code>daily_checkpoint.sh</code> is also used on edge servers and filtered replicas. When run on edge servers and filtered replicas, this script maintains the replica’s <code>offline_db</code> in a manner similar to the master, except that the journal rotation is skipped (as that can be done only on the master).</p> </div> <div class="paragraph"> <p>The <code>sync_replica.sh</code> script maintains the <code>offline_db</code> on the unfiltered replicas. It rsyncs the checkpoints from the master, and replays them to the local <code>offline_db</code>. This keeps the <code>offline_db</code> of the replica current, which is good to have should the replica ever need to take over for the master.</p> </div> <div class="paragraph"> <p>INFO: For HA/DR and any purpose where replicas are not filtered, we promote that replicas of type <code>standby</code> and <code>forwarding-standby</code> displace replicas of type <code>replica</code> and <code>forwarding-replica</code>.</p> </div> </div> </div> <div class="sect1"> <h2 id="_sdp_structure_and_journalprefix">5. SDP Structure and <code>journalPrefix</code></h2> <div class="sectionbody"> <div class="paragraph"> <p>On every server machine with the SDP structure where a <code>p4d</code> service runs (excluding broker-only and proxy-only hosts), a structure like the following should exist for each instance:</p> </div> <div class="ulist"> <ul> <li> <p>A <code>/hxdepots/p4/N/checkpoints</code> directory</p> </li> <li> <p>In <code>/p4/N</code>, and symlink <code>checkpionts</code> that links to <code>/hxdepots/p4/N/checkpoints</code>, such that it can be referred to as <code>/p4/N/checkpoints</code>.</p> </li> </ul> </div> <div class="paragraph"> <p>In addtion, edge servers and filtered replicas will also have a structure like the following for each instance that runs an edge server or filtered replica:</p> </div> <div class="ulist"> <ul> <li> <p>A <code>/hxdepots/p4/N/checkpoints.ShortServerID</code> directory</p> </li> <li> <p>In <code>/p4/N</code>, and symlink <code>checkpionts.ShortServerID</code> that links to <code>/hxdepots/p4/N/checkpoints.ShortServerID</code>, such that it can be referred to as <code>/p4/N/checkpoints.ShortServerID</code>.</p> </li> </ul> </div> <div class="paragraph"> <p>The SDP <code>mkdirs.sh</code> script, which sets up the initial SDP structure, initializes this structure on initial install.</p> </div> </div> </div> <div class="sect1"> <h2 id="_goals_of_this_standard">6. Goals of this Standard</h2> <div class="sectionbody"> <div class="paragraph"> <p>Some design of goals this standard:</p> </div> <div class="ulist"> <ul> <li> <p>Make it so the <code>/p4/N/checkpoints</code> folder is reserved to mean checkpoints created from the master server’s full metadata set.</p> </li> <li> <p>Make the <code>/p4/N/checkpoints</code> folder be safe to rsync from the master to any machine in the topology (as may be needed in certain recovery situations for replicas and edge servers).</p> </li> <li> <p>Make it so the SDP <code>/hxdepots</code> volume can be NFS-mounted across multple SDP machines safely, such that two or more edge servers (or filtered replicas) could share versioned files, while writeing to separate checkpoints directories on a per-ServerID basis.</p> </li> <li> <p>Support all replication uses cases, including support for 'Workspace Servers', a name referring to a set of edge servers deployed in in the same location, typically sharing <code>/hxdepots</code> via NFS. Use of Workspace Servers can be used to scale Helix Core horizontally for massive user bases (typically several thousand users).</p> </li> </ul> </div> </div> </div> </div> <div id="footer"> <div id="footer-text"> Version v2020.1<br> Last updated 2020-12-10 00:11:04 -0500 </div> </div> </body> </html>
# | Change | User | Description | Committed | |
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#3 | 27156 | C. Thomas Tyler |
Consolidated SDP Standards into the SDP Guide for UNIX/Linux. Added references to those sections in the Windows SDP Guide. Normalized doc titles. Various other doc update. |
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#2 | 27020 | C. Thomas Tyler |
Added content covering replicas of edge servers, and adding more detail & corrections. |
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#1 | 27018 | C. Thomas Tyler |
Added SDP Journal Prefix standard doc. #review-27019 |