mjsax commented on code in PR #14181:
URL: https://github.com/apache/kafka/pull/14181#discussion_r1290489338
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docs/streams/developer-guide/config-streams.html:
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@@ -718,6 +760,24 @@ <h4><a class="toc-backref"
href="#id34">rack.aware.assignment.tags</a><a class="
</p>
</div>
</blockquote>
+ </div>
+ <div class="section" id="rack-aware-assignment-traffic-cost">
+ <h4><a class="toc-backref"
href="#id36">rack.aware.assignment.traffic_cost</a><a class="headerlink"
href="#rack-aware-assignment-traffic-cost" title="Permalink to this
headline"></a></h4>
+ <blockquote>
+ <div>
+ <p>
+ This configuration sets the cost of cross rack traffic. Together
with <code class="docutils literal"><span
class="pre">rack.aware.assignment.non_overlap_cost</span></code>,
+ they control whether the optimizer favors minimizing cross rack
traffic or minimizing the movement of tasks in the existing assignment. If this
config is set to a larger value than <code class="docutils literal"><span
class="pre">rack.aware.assignment.non_overlap_cost</span></code>,
+ the optimizer will try to compute an assignment which minimize
the cross rack traffic. Note that the optimizer takes the ratio of these two
configs into consideration of favoring maintaining existing assignment or
minimizing traffic cost. For example, setting
+ <code class="docutils literal"><span
class="pre">rack.aware.assignment.traffic_cost</span></code> to 10 and <code
class="docutils literal"><span
class="pre">rack.aware.assignment.non_overlap_cost</span></code> to 1 is more
likely to minimize cross rack traffic than setting
+ <code class="docutils literal"><span
class="pre">rack.aware.assignment.traffic_cost</span></code> to 100 and <code
class="docutils literal"><span
class="pre">rack.aware.assignment.non_overlap_cost</span></code> to 50.
+ </p>
+ <p>
+ The default value is null which means default traffic cost in
different assignors will be used. In <code class="docutils literal"><span
class="pre">StickyTaskAssignor</span></code>, it has a lower default value than
<code class="docutils literal"><span
class="pre">rack.aware.assignment.non_overlap_cost</span></code>.
Review Comment:
As above: include default value?
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