CHANGES and release note

diff --git a/CHANGES b/CHANGES
index 860b84ba66fead697499fc7b1d74de6a1cd619b5..a6a44f5125a3dc9113a8af7b9c54ca21a9175479 100644 (file)
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,10 @@
+5362.  [func]          Limit the size of IXFR responses so that AXFR will
+                       be used instead if it would be smaller. This is
+                       controlled by the "max-ixfr-ratio" option, which
+                       is a percentage representing the ratio of IXFR size
+                       to the size of the entire zone. This value cannot
+                       exceed 100%, which is the default. [GL #1515]
+
 5361.  [bug]           named might not accept new connections after
                        hitting tcp-clients quota. [GL #1643]
 

diff --git a/doc/arm/notes-9.17.0.xml b/doc/arm/notes-9.17.0.xml
index 38eda27a790f339e79e2d6a724fae460b93f0f03..a2ea9c73b211753ad3886ffc8c4f13a1e0f12804 100644 (file)
--- a/doc/arm/notes-9.17.0.xml
+++ b/doc/arm/notes-9.17.0.xml
@@ -51,4 +51,26 @@
     </itemizedlist>
   </section>
 
+  <section xml:id="relnotes-9.17.0-new"><info><title>New Features</title></info>
+    <itemizedlist>
+      <listitem>
+       <para>
+         When a secondary server receives a large incremental zone
+         transfer (IXFR), it can have a negative impact on query
+         performance while the incremental changes are applied to
+         the zone. To address this, <command>named</command> can now
+         limit the size of IXFR responses it sends in response to zone
+         transfer requests. If an IXFR response would be larger than an
+         AXFR of the entire zone, it will send an AXFR resonse instead.
+       </para>
+       <para>
+         This behavior is controlled by the <command>max-ixfr-ratio</command>
+         option - a percentage value representing the ratio of IXFR size
+         to the size of a full zone transfer. This value cannot exceed
+         100%, which is also the default. [GL #1515]
+       </para>
+      </listitem>
+    </itemizedlist>
+  </section>
+
 </section>