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<p class="MsoNormal"><span style="color:#1F497D">Additions/comments inline below.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Unmesh G.<o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Murugan, Visnusaran <br>
<b>Sent:</b> Thursday, September 18, 2014 1:46 PM<br>
<b>To:</b> openstack-dev@lists.openstack.org<br>
<b>Subject:</b> [openstack-dev] [heat] Persist graph for convergence<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Below is the model proposal for persisting ResourceGraph.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse">
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<tr>
<td width="208" valign="top" style="width:155.8pt;border:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><b>Column name<o:p></o:p></b></p>
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<td width="208" valign="top" style="width:155.85pt;border:solid windowtext 1.0pt;border-left:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><b>Type<o:p></o:p></b></p>
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<p class="MsoNormal"><b>Constraint<o:p></o:p></b></p>
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<td width="208" valign="top" style="width:155.8pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">resource_id<o:p></o:p></p>
</td>
<td width="208" valign="top" style="width:155.85pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">varchar(36)<o:p></o:p></p>
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<p class="MsoNormal">NOT NULL ForeignKey resource.id<o:p></o:p></p>
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<td width="208" valign="top" style="width:155.8pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">needed_by<o:p></o:p></p>
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<td width="208" valign="top" style="width:155.85pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">varchar(36)<o:p></o:p></p>
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<td width="262" valign="top" style="width:196.45pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">NULL ForeignKey resource.id<o:p></o:p></p>
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<td width="208" valign="top" style="width:155.8pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">stack_id<o:p></o:p></p>
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<p class="MsoNormal">varchar(36)<o:p></o:p></p>
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<td width="262" valign="top" style="width:196.45pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">NOT NULL ForeignKey stack.id<o:p></o:p></p>
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<tr>
<td width="208" valign="top" style="width:155.8pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">retry_count<o:p></o:p></p>
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<td width="208" valign="top" style="width:155.85pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">Integer<o:p></o:p></p>
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<td width="262" valign="top" style="width:196.45pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">Default (0)<o:p></o:p></p>
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<td width="208" valign="top" style="width:155.8pt;border:solid windowtext 1.0pt;border-top:none;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">observed_ready<o:p></o:p></p>
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<td width="208" valign="top" style="width:155.85pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal">Boolean<o:p></o:p></p>
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<p class="MsoNormal">Default False<o:p></o:p></p>
</td>
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</table>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Create cycle:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Persist graph<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">[Unmesh] – So, it is a pre-requisite to persist all the resources of a stack (in the resource table) to be able to persist a graph (i.e step #0).<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Mark <b>desired states</b> for all resources in the stack. (table: resources)<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">[Unmesh] – This I believe should be done as a part of persisting a stack’s resources (in step #0).<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Initiate stack create by calculating leaf nodes (All observed_ready=False nodes in resource_id column but not in needed_by column)<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Post create resource jobs to engine worker<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Engine worker upon task initiation posts observe task to convergence-observer and complete tack execution (return true)<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">6.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Mark observed_ready upon receiving resource completion notification from observer. Repeat step 3 through 6 till all nodes (resources) are marked observed_ready.<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">[Unmesh] – In case resource creation fails, the worker will increment retry_count and try creating the resource for a maximum of ‘action_retry_limit’ configured value.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">7.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>If not more nodes, then mark stack create complete and return happy<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Update cycle:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo4"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Persist new graph for new stack created<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo4"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Mark desired state for all resources in both old and new stacks.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo4"><![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Perform steps 3 to 6<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo4"><![if !supportLists]><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Delete old stack, garbage collect unwanted resources<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo4"><![if !supportLists]><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Mark stack update complete and return happy.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Clint had in fact proposed to have a “version Integer default(0)”. To achieve this I feel Table:Stack should also have versioning instead of creating a backup_stack.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Currently backup and nested stack relation is achieved using owner_id. In case if update, versioning makes more sense instead on creating a backup stack and setting owner_id as current stack.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Vishnu<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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