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<p class="MsoNormal"><span style="color:#1F497D">Hi David,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">We are supporting a content publishing system where in there are writers who inputs a story which passes through a document work flow where editors updates the story and creates a version of story that get published
 at the end in the newsletter. These newsletters are published on a daily basis. The writers and editors are spread across different geographical regions and it is the latency of the application that we need to have three active data centers.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Please find my comments to yours questions below.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<br>
Prakash<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p>&nbsp;</o:p></span></p>
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<p class="MsoNormal"><b>From:</b> general-bounces@developer.marklogic.com [mailto:general-bounces@developer.marklogic.com]
<b>On Behalf Of </b>David Gorbet<br>
<b>Sent:</b> Wednesday, January 20, 2016 10:51 PM<br>
<b>To:</b> MarkLogic Developer Discussion<br>
<b>Subject:</b> Re: [MarkLogic Dev General] Data sync up within ML clusters in different zones<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Some questions:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">&middot;<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style="color:#1F497D">Is this database insert-only or does it also allow updates?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo3"><![if !supportLists]><span style="font-family:Wingdings;color:#1F497D"><span style="mso-list:Ignore">&egrave;<span style="font:7.0pt &quot;Times New Roman&quot;">
</span></span></span><![endif]><span style="color:#1F497D">It allows updates as well<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">&middot;<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style="color:#1F497D">If it allows updates, are those updates mastered in one of the three locations for a given document, or is it possible for any location to update any document at any time?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo3"><![if !supportLists]><span style="font-family:Wingdings;color:#1F497D"><span style="mso-list:Ignore">&egrave;<span style="font:7.0pt &quot;Times New Roman&quot;">
</span></span></span><![endif]><span style="color:#1F497D">It is possible for any location to update any document any time.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">&middot;<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style="color:#1F497D">If it&#8217;s possible for multiple locations to update the same document at the same time, what are the business rules for resolving conflicts?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo3"><![if !supportLists]><span style="font-family:Wingdings;color:#1F497D"><span style="mso-list:Ignore">&egrave;<span style="font:7.0pt &quot;Times New Roman&quot;">
</span></span></span><![endif]><span style="color:#1F497D">Currently we have only one data center in USA which takes care of all the traffic with lots of Singapore users complains regarding the slowness.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">&middot;<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style="color:#1F497D">When you query, do you need to ensure a consistent view across data in all three locations (even if that means it&#8217;s only up to date with respect to the slowest location), or do you want an inconsistent
 view, but one that has the most recent data from each location?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo3"><![if !supportLists]><span style="font-family:Wingdings;color:#1F497D"><span style="mso-list:Ignore">&egrave;<span style="font:7.0pt &quot;Times New Roman&quot;">
</span></span></span><![endif]><span style="color:#1F497D">We want a consistent view across data in all the three locations.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">In general, anything you can tell us about the application could shed light on the query and update patterns would help, including why you want three active data centers in the first place (is it latency of the
 application, or something else?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p>&nbsp;</o:p></span></p>
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<p class="MsoNormal"><b>From:</b> <a href="mailto:general-bounces@developer.marklogic.com">
general-bounces@developer.marklogic.com</a> [<a href="mailto:general-bounces@developer.marklogic.com">mailto:general-bounces@developer.marklogic.com</a>]
<b>On Behalf Of </b>Prakashkumar Patel<br>
<b>Sent:</b> Wednesday, January 20, 2016 6:03 AM<br>
<b>To:</b> MarkLogic Developer Discussion &lt;<a href="mailto:general@developer.marklogic.com">general@developer.marklogic.com</a>&gt;<br>
<b>Subject:</b> [MarkLogic Dev General] Data sync up within ML clusters in different zones<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">We are using Marklogic 7 and we are having three different ML clusters which are all primary in USA, UK and Singapore. They are all supporting the same application that inserts data into those clusters. Data in all the three clusters has
 to be same. For example if there is a document insert in USA cluster, it has to be inserted in UK and Singapore clusters as well. Same applies for any document delete. And all the three cluster has to have the most latest version of a document if that is getting
 updated frequently.<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">Is there any feature in Marklogic that enables us to do this? If not, is there any best practice that you will suggest us to follow?<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Prakash<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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