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<!--StartFragment--><p class="MsoNormal"><span style="color: rgb(16, 73, 188); ">I want to start a dialog around adding some</span><span style="color: rgb(16, 73, 188); "> </span><span style="color: rgb(16, 73, 188); ">usability features to Savanna, now that I have had a chance to spend a fair</span><span style="color: rgb(16, 73, 188); "> </span><span style="color: rgb(16, 73, 188); ">amount of time</span><span style="color: rgb(16, 73, 188); "> </span><span style="color: rgb(16, 73, 188); ">provisioning, scaling and changing clusters. Here is a list of</span><span style="color: rgb(16, 73, 188); "> </span><span style="color: rgb(16, 73, 188); ">items that I believe are important to address; comments welcomed</span><font color="#1049bc">:</font><span style="color: rgb(16, 73, 188); "> </span></p><p class="MsoNormal"><font color="#1049bc">1. Changing an OpenStack flavor associated with a node-group template has a ripple effect on both node group and cluster templates. The reason for this is that OpenStack does not support modification of flavors; when a flavor is modified (RAM, CPU, Root Disk, etc.) the flavor is deleted and a new one is created resulting in a new flavor id. The implication is that both node-group referencing the flavor [id] and any cluster templates referencing the affected node-group become stale and unusable. A user then has to start from scratch, creating new node-groups and cluster templates for a simple flavor change.<br><span class="Apple-tab-span" style="white-space:pre"> </span>a. A possible solution to this is to internally associate flavor name with node-group and look up the flavor id based on flavor name when provisioning instances<br><span class="Apple-tab-span" style="white-space:pre"> </span>b. At a minimum it should be possible to change the flavor id associated with a node-group. See #2.<br><br></font></p><p class="MsoNormal"><font color="#1049bc">2. Cluster templates and node group templates are immutable. This is more of an issue at the node-group level as I often times want to make changes to a node-group and want to affect all cluster templates that make use of that node-group. I see this as being fairly commonplace.<br><br></font></p><p class="MsoNormal"><font color="#1049bc">3. Before provisioning a cluster, quotas should be checked to make sure that enough quota exists. I know this can be done transactionally (check quota, spawn cluster), but a basic check would go a long way.<br><br></font></p><p class="MsoNormal"><font color="#1049bc">4. Spawning a large cluster comes with some problems today, as Savanna will abort if a single VM fails. In deploying large clusters (100’s to x1000), which will be commonplace, having a single slave VM (i.e. data node) not spawn properly should not necessarily be a reason to abort the entire deployment, in particular in a scaling operation. Obviously the failing VM cannot be a master service. This applies both to the plugin as well as controller as they are both involved in the deployment. I could see a possible solution being the creation of an error/fault policy allowing a user to specify (perhaps optionally) a % or hard number for minimum # of nodes that need to come up without aborting deployment.<br><span class="Apple-tab-span" style="white-space:pre"> </span>a. This also applies to scaling the cluster by larger increments<br> <br>Just some thoughts based on my experience last week; comments welcomed.<br> <br>Best,<br> <br>Erik<br> <br> </font></p>
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