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-rw-r--r--docs/architecture/architecture.rst73
-rw-r--r--docs/architecture/images/MCLocalDmaap.svg1
-rw-r--r--docs/architecture/images/MCLocalHB.svg1
-rw-r--r--docs/architecture/images/MCMissedHB.svg1
-rw-r--r--docs/architecture/images/MCSharedDB.svg1
-rw-r--r--docs/architecture/images/MCSharedDmaap.svg1
-rw-r--r--docs/architecture/images/MCSharedHB.svg1
-rw-r--r--docs/release-notes.rst12
8 files changed, 90 insertions, 1 deletions
diff --git a/docs/architecture/architecture.rst b/docs/architecture/architecture.rst
index 7edf9e07..9e999e3b 100644
--- a/docs/architecture/architecture.rst
+++ b/docs/architecture/architecture.rst
@@ -701,6 +701,79 @@ APIs. Some example PEPs are: DCAE, OOF, and SDNC.
See Section 3.4 of the :ref:`Policy Design and Development <design-label>`
for more information on the Decision APIs.
+2.3.8 Multi-Cluster Support
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Multi-cluster support was added to the Policy Framework during the Istanbul release,
+enabling redundancy, load-sharing, and inter-site failover.
+
+**Note:** *multi-cluster support has only been minimally tested, and is thus still
+experimental.*
+
+2.3.8.1 Shared DB
+"""""""""""""""""
+
+Multi-cluster support requires a shared DB. Rather than spinning up a
+separate DB for each cluster, all of the clusters are pointed to a common DB.
+Policy-API adds policy types and policies, while Policy-PAP manages PDP Groups and
+Subgroups, as well as policy deployments. The information in these tables is not
+segregated, but is, instead, shared across the API and PAP components across all of
+the clusters.
+
+.. image:: images/MCSharedDB.svg
+
+2.3.8.2 DMaaP Arrangement
+"""""""""""""""""""""""""
+
+As in prior releases, communication between the PAPs and PDPs still takes place via
+DMaaP. Two arrangements, described below, are supported.
+
+2.3.8.2.1 Local DMaaP
+~~~~~~~~~~~~~~~~~~~~~
+
+In this arrangement, each cluster is associated with its own, local
+DMaaP, and communication only happens between PAPs and PDPs within the same cluster.
+
+.. image:: images/MCLocalDmaap.svg
+
+The one
+limitation with this approach is that, when a PAP in cluster A deploys a policy, PAP
+is only able to inform the PDPs in the local cluster; the PDPs in the other clusters
+are not made aware of the new deployment until they generate a heartbeat, at which
+point, their local PAP will inform them of the new deployment. The same is true of
+changes made to the state of a PDP Group; changes only propagate to PDPs in other
+clusters in response to heartbeats generated by the PDPs.
+
+.. image:: images/MCLocalHB.svg
+
+2.3.8.2.2 Shared DMaaP
+~~~~~~~~~~~~~~~~~~~~~~
+
+In this arrangement, the PAPs and PDPs in all of the clusters are
+pointed to a common DMaaP. Because the PAP and PDPs all communicate via the same
+DMaaP, when a PAP deploys a policy, all PDPs are made aware, rather than having to
+wait for a heartbeat.
+
+.. image:: images/MCSharedDmaap.svg
+
+2.3.8.3 Missed Heartbeat
+""""""""""""""""""""""""
+
+To manage the removal of terminated PDPs from the DB, a record, containing a
+"last-updated" timestamp, is maintained within the DB for each PDP. Whether using a
+local or shared DMaaP, any PAP receiving a message from a PDP will update the timestamp
+in the associated record, thus keeping the records “current”.
+
+.. image:: images/MCSharedHB.svg
+
+Periodically, each PAP will sweep the DB of PDP records whose timestamp has not been
+updated recently. The frequency with which it is checked is based on the value of
+the "heartbeatMs" configuration parameter, with a record considered expired if no
+heartbeat has been received for three cycles.
+
+.. image:: images/MCMissedHB.svg
+
+
3. APIs Provided by the Policy Framework
========================================
diff --git a/docs/architecture/images/MCLocalDmaap.svg b/docs/architecture/images/MCLocalDmaap.svg
new file mode 100644
index 00000000..1b851223
--- /dev/null
+++ b/docs/architecture/images/MCLocalDmaap.svg
@@ -0,0 +1 @@
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diff --git a/docs/architecture/images/MCLocalHB.svg b/docs/architecture/images/MCLocalHB.svg
new file mode 100644
index 00000000..ae26672c
--- /dev/null
+++ b/docs/architecture/images/MCLocalHB.svg
@@ -0,0 +1 @@
+<svg width="1280" height="720" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" overflow="hidden"><defs><clipPath id="clip0"><rect x="0" y="0" width="1280" height="720"/></clipPath></defs><g clip-path="url(#clip0)"><rect x="0" y="0" width="1280" height="720" fill="#FFFFFF"/><text font-family="Calibri,Calibri_MSFontService,sans-serif" font-weight="400" font-size="24" transform="translate(1010.77 137)">Cluster B</text><path d="M504.5 134.668C504.5 110.275 524.275 90.5001 548.668 90.5001L725.332 90.5001C749.726 90.5001 769.5 110.275 769.5 134.668L769.5 652.332C769.5 676.725 749.726 696.5 725.332 696.5L548.668 696.5C524.275 696.5 504.5 676.725 504.5 652.332Z" stroke="#2F528F" stroke-width="1.33333" stroke-miterlimit="8" fill="none" fill-rule="evenodd"/><rect x="544.5" y="163.5" width="186" height="55" stroke="#41719C" stroke-width="1.33333" stroke-miterlimit="8" fill="#5B9BD5"/><text fill="#FFFFFF" font-family="Calibri,Calibri_MSFontService,sans-serif" 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diff --git a/docs/architecture/images/MCMissedHB.svg b/docs/architecture/images/MCMissedHB.svg
new file mode 100644
index 00000000..d5b39b88
--- /dev/null
+++ b/docs/architecture/images/MCMissedHB.svg
@@ -0,0 +1 @@
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diff --git a/docs/architecture/images/MCSharedDB.svg b/docs/architecture/images/MCSharedDB.svg
new file mode 100644
index 00000000..6d6126db
--- /dev/null
+++ b/docs/architecture/images/MCSharedDB.svg
@@ -0,0 +1 @@
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diff --git a/docs/release-notes.rst b/docs/release-notes.rst
index a629229c..a0fc0ea6 100644
--- a/docs/release-notes.rst
+++ b/docs/release-notes.rst
@@ -38,7 +38,7 @@ Artifacts released:
"policy/pap", "2.4.5", "onap/policy-pap:2.4.5"
"policy/drools-pdp", "1.8.4", "onap/policy-drools:1.8.4"
"policy/apex-pdp", "2.5.4", "onap/policy-apex-pdp:2.5.4"
- "policy/xacml-pdp", "2.4.4", "onap/policy-xacml-pdp:2.4.4"
+ "policy/xacml-pdp", "2.4.5", "onap/policy-xacml-pdp:2.4.5"
"policy/drools-applications", "1.8.4", "onap/policy-pdpd-cl:1.8.4"
"policy/distribution", "2.5.4", "onap/policy-distribution:2.5.4"
"policy/docker", "2.2.1", "onap/policy-jdk-alpine:2.2.1, onap/policy-jre-alpine:2.2.1"
@@ -67,6 +67,16 @@ Artifacts released:
* `[POLICY-3516] <https://jira.onap.org/browse/POLICY-3516>`_ - Upgrade CDS dependency to the 1.1.5 version
+Known Limitations
+=================
+
+The APIs provided by xacml-pdp (e.g., healthcheck, statistics, decision)
+are always active. While PAP controls which policies are deployed to a
+xacml-pdp, it does not control whether or not the APIs are active.
+In other words, xacml-pdp will respond to decision requests, regardless
+of whether PAP has made it ACTIVE or PASSIVE.
+
+
Version: 8.0.0
--------------