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<p class="MsoNormal">Hi Sahara,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Recently, I learned Sahara support nodes scale up & scale down, which means “scale” has been limited to node number.<o:p></o:p></p>
<p class="MsoNormal">Is it possible to do a “instance scale”?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For example, I build a small cluster at first, several slave nodes (running datanode & nodemanager) and a single master node (running all other processes)<o:p></o:p></p>
<p class="MsoNormal">I keep increasing the number of slave nodes, and in a moment, my master node has become the performance bottleneck of the whole cluster.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In this case, I would like to do several things, such as:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>resize the master node. Using command like “nova resize”, to add more cpu & memory and other resources for this single instance.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Split processes on the master node to several nodes.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I think it make sense to users.<o:p></o:p></p>
<p class="MsoNormal">Or the whole “performance bottleneck” staff would never happen in real world ???<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Another example, I already have a big cluster, and now I want to enable a new service on it.
<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>I would like to start a new node for the new service and add the new node into my cluster.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Or, just start the new service on a node which already in the cluster.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Currently, Sahara start cluster and manage all nodes based on “templates”, so everything on “living” has to be pre-defined.<o:p></o:p></p>
<p class="MsoNormal">Things on above breaks the whole “pre-defined” thing.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So, my question here is:<o:p></o:p></p>
<p class="MsoNormal"> Is it possible for Sahara to do things like that ?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> Would Sahara want to support things like this ?<o:p></o:p></p>
<p class="MsoNormal"> If yes, any plans in the past, in the future?<o:p></o:p></p>
<p class="MsoNormal"> If not, any special reasons ??<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Looking forward to your reply.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks.<o:p></o:p></p>
<p class="MsoNormal">-chen<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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