2022.03 Sulfur Platform Upgrade

This document describes the steps to help users upgrade from Phosphorus to Sulfur planned platform. Refer to Managed Release Integrated (MRI) project upgrade patches for more information.


JDK 11 Version

Phosphorus requires Java 11, both during compile-time and run-time. Make sure to install JDK 11 corresponding to at least openjdk-11.0.10, and that the JAVA_HOME environment variable points to the JDK directory.

Version Bump

Before performing platform upgrade, do the following to bump the odlparent versions (for example, bump-odl-version):

  1. Update the odlparent version from 9.0.13 to 10.0.0. There should not be any reference to org.opendaylight.odlparent, except for 10.0.0. This includes custom feature.xml templates (src/main/feature/feature.xml), the version range should be “[10,11)” instead of “[9,10)”, “[5.0.3,6)” or any other variation.

bump-odl-version odlparent 9.0.13 10.0.0
  1. Update the direct yangtools version references from 7.0.14 to 8.0.3, There should not be any reference to org.opendaylight.yangtools, except for 8.0.2. This includes custom feature.xml templates (src/main/feature/feature.xml), the version range should be “[8,9)” instead of “[7,8)”.

bump-odl-version yangtools 7.0.14 8.0.3
  1. Update the MD-SAL version from 8.0.11 to 9.0.2. There should not be any reference to org.opendaylight.mdsal, except for 9.0.2.

bump-odl-version mdsal 8.0.11 9.0.2
  1. Update the Controller version from 4.0.10 to 5.0.3. There should not be any reference to org.opendaylight.controller, except for 5.0.3.

bump-odl-version controller 4.0.10 5.0.3
  1. Update the InfraUtils version from 2.0.13 to 3.0.0. There should not be any reference to org.opendaylight.infrautils, except for 3.0.0.

bump-odl-version infrautils 2.0.13 3.0.0
  1. Update the AAA version from 0.14.10 to 0.15.3. There should not be any reference to org.opendaylight.aaa, except for 0.15.3.

bump-odl-version aaa 0.14.10 0.15.3
  1. Update the NETCONF version from 2.0.14 to 3.0.2. There should not be any reference to org.opendaylight.netconf, except for 3.0.2.

bump-odl-version netconf 2.0.14 3.0.2

Install Dependent Projects

Before performing platform upgrade, users must also install any dependent project. To locally install a dependent project, pull and install the respective sulfur-mri changes for any dependent project.

Perform the following steps to save time when locally installing any dependent project:

  • For quick install:

mvn -Pq clean install
  • If previously installed, go offline and/or use the no-snapshot-update option.

mvn -Pq -o -nsu clean install

Upgrade the ODL Parent

The following sub-section describes how to upgrade to the ODL Parent version 9. Refer to the ODL Parent Release Notes for more information.


Any version range referencing version 9 of ODL Parent must be changed to “[10,11)” for ODL Parent 10.

<feature name="odl-infrautils-caches">
    <feature version="[10,11)">odl-guava</feature>

ODL Parent Impacts

Minimum Maven version is 3.8.3

The minimum version of Apache Maven has been raised to 3.8.3. Attempts to build any component with an older version will result in a build failure.

blueprint-maven-plugin declarations removed

The declarations of blueprint-maven-plugin and its related annotations has been removed. The plugin seems to be no longer maintained. Downstreams are advised to either switch to a hand-written XML container, or pick maintain these declarations themselves.

Powermock declarations removed

The declarations of powermock dependencies have been removed. Downstreams are advised to migrate to pure Mockito, as it covers all use cases supported by Powermock. Alternatively, downstreams can maintain these declarations, but note that Mockito declaration needs to also be downgraded:


Removed OSGi roll-up bundles

In preparation for adoption of OSGi Release 8, the declarations of roll-up bundles – osgi.annotation, osgi.core, osgi.cmpn – have been removed. Unfortunately these are still leaking from Karaf’s BOM with scope=compile.

Downstreams need to migrate their dependency declarations to the individual bundles, like org.osgi.framework, org.osgi.service.component.annotations and similar. Failure to do so will end up being caught by Single Feature Test.

YANG Tools Impacts

SchemaNode.getPath() was removed

The original idea that each SchemaNode has a unique identifier, available through SchemaNode.getPath(), has proven to be a scalability issue with vendor models. The identifiers themselves account for up to 19% of all objects retained by EffectiveModelContext, holding up to 17% of retained memory. These were also preventing a number of useful performance and memory footprint optimizations.

In yangtools-8 we have finished removal of this method. Downstreams need to adjust all call sites which relied on this method. There are a number of utilities, namely yang.model.util.SchemaInferenceStack, yang.data.util.DataSchemaContextTree and yang.model.api.EffectiveStatementInference allow for navigating the schema tree based on schema tree and data tree QNames, as well as via yang-data-api PathArguments. In case of pure schema tree look-up, a yang.model.api.stmt.SchemaNodeIdentifier can be used as the replacement for SchemaPath. Most notably DataSchemaContextTree has a new enterPath(YangInstanceIdentifier method, which returns both the corresponding DataSchemaContextNode and suitably initialized SchemaInferenceStack.

Decimal64 in use for decimal64 leaf and leaf-list values

The data mapping of type decimal64 has changed from java.math.BigDecimal to yang.common.Decimal64. This allows us to lower storage requirements as well as to express the exact data type semantics. All codecs have been updated to account for this change, but users constructing these values manually need to be adjusted to construct the correct value.

YANG parser validates unique argument

The contents of the argument to unique statement are now validated and are required to be consistent with the model. This means that each schema node identifier must resolve to a leaf statement, otherwise the model will be rejected with a SourceException. Such violations should be rare in practice. An example of a non-compliant model is:

list foo {
  leaf bar {
    type string;

  unique baz; // 'baz' does not exist, should perhaps be 'bar'?

YANG parser validates version-1 and version-1.1 imports

RFC7950 explicitly forbids using import-with revision of a yang-version 1.1 into a yang-version 1 module. YANG parser now properly enforces this restriction. Attempting to process the following modules will result in a failure:

module foo {
  namespace foo;
  prefix foo;
  yang-version 1.1;

  revision 2022-04-04;

module bar {
  namespace bar;
  prefix bar;
  // 'yang-version 1'; is implied

  import foo {
    prefix foo;
    revision-date 2022-04-04; // forbidden, will still work without this line

ModelStatement hashCode()/equals() are codified

The equality contract of the various SchemaNode and ModelStatement subclasses was ill-defined, with the various implementations having a number of competing and conflicting takes on what the contract is. These idiosyncracies have been resolved and both hashCode and equals methods are now defined to map to object identity. Users requiring a different comparison need to implement such methods themselves, for example by examining EffectiveStatement argument and sub-statements.

RpcError design updated

The yang.common.RpcError interface design has been updated to improve type safety. It is now using yang.common.ErrorType instead of brewing its own. It is also using yang.common.ErrorTag instead of a String for error-tag specification. Downstreams are advised to use ErrorTag.OPERATION_FAILED and related standard-defined tags, or instantiate their own via provided constructor.

MD-SAL Impacts

This MD-SAL release contains a largely-rewritten Java Binding runtime component. This change was necessitated by the removal of SchemaNode.getPath() as noted above. The implementation has not been optimized and may have a larger memory footprint. Optimizations in this area a expected to occur over the next few releases.

Generated Binding Builders do not reference yangtools.concepts.Builder

Builder classes for generated interfaces have implemented yangtools.concepts.Builder interface to get a common definition of their build() method. This design decision lead to inability to understand where a particular Builder’s build() method was called. In this release Builders do not implement a common interface, hence each build() method has a precise call site.

As part of this change, the unused AssertDataObjects class has been removed from mdsal-binding-util.

Mapping of system-ordered leaf-lists changed

The Binding mapping of leaf-list statements has been updated to reflect the underlying semantics. The mapping now takes into account ordered-by sub-statement.

There is no change for user-ordered leaf-lists, i.e. this construct will result in a List<String>, as the semantics dictates the order of entries is significant:

container foo {
  leaf-list bar {
    type string;
    ordered-by user;

For leaf-lists without an ordered-by statement and for those with an ordered-by system statement, the mapping has changed to java.util.Set, i.e. the following will result in a Set<String>:

container foo {
  leaf-list bar {
    type string;
    // implied: ordered-by system;

This is strictly correct interpretation: the results of hashCode() and equals() do not depend on the actual order of elements.

Users are advised to reconcile the YANG model and the corresponding Java code, either by updating the model to include ordered-by user if the order has semantic meaning, or by adjusting calling code to accept a java.util.Set. Please note that Java 11 unmodifiable Set, as available through Set.of(), Set.copyOf() and similar, as well as HashSet have undefined iteration order. In fact unmodifiable Set changes its iteration order with each JVM invocation. To ease user experience and output predictability, it is recommended to use Guava’s ImmutableSet, as it explicitly retains iteration order.

InstanceIdentifier semantics is strictly instantiated data

The contracts around Binding InstanceIdentifier have been tightened up. The usual construction methods now require the identifier to start at a child of a DataRoot element and all items need to implement ChildOf contract, rather than plain DataObject. This improves safety and removes the backdoor where an InstanceIdentifier could be use to identify, for example, a notification.

It also means that top-level constructs defined in a grouping and then used directly by the defining module:

module foo {
  grouping grp {
    container bar;

  uses grp;

cannot be created directly through InstanceIdentifier.create() method. This a modeling pattern seen in OpenConfig models, but is used by others as well. The problem here is that since grp is a top-level grouping, it could very well be used by another module:

module baz {
  import foo { prefix foo; }

  uses foo:grp;

The two instances of Bar are different and the InstanceIdentifier needs to positively identify which one it is referencing. To reference bar here, the correct invocation is:

// Bar instantiated in 'module foo'
InstanceIdentifier<Bar> fooBar = InstanceIdentifier.builderOfInherited(FooData.class, Bar.class).build();
// Bar instantiated in 'module baz'
InstanceIdentifier<Bar> bazBar = InstanceIdentifier.builderOfInherited(BazData.class, Bar.class).build();

RFC7223 ietf-interfaces model removed

The 2014-05-08 revision of ietf-interfaces.yang has been removed. Users are advised to migrate to the RFC8343 version of this model (revision 2018-02-20), which provides better alignment with OpenDaylight architecture and removes a number of duplicated constructs. If such migration is not possible, users need to package the old model themselves.

RFC7277 ietf-ip model removed

The 2014-06-16 revision of ietf-ip.yang has been removed. Users are advised to migrate to the RFC8344 version of this model (revision 2018-02-20), which provides better alignment with OpenDaylight architecture and removes a number of duplicated constructs. If such migration is not possible, users need to package the old model themselves.

RFC7895 ietf-yang-library removed

The 2016-06-21 revision of ietf-yang-library.yang has been removed. Users to migrate to the RFC8252 version of this model (revision 2019-01-04), which provides backwards compatibility and introduces ability to reason about NMDA devices.

iana-if-type updated to 2021-06-21

The iana-if-type model has been refreshed to revision 2021-06-21. This change makes a number of IANA assignments available downstream. The rfc7224-20180703-iana-if-type artifact has been removed as part of this change. Going forward we will provide a single revision of iana-if-type and update it as appropriate in major MD-SAL releases.

iana-routing-types updated to 2021-10-19

The iana-routing-types model has been refreshed to revision 2021-10-19. This change makes a number of IANA AFI/SAFI assignments available downstream.

Controller Impacts

OpenDaylight Blueprint extension not provided with odl-mdsal-broker

The OSGi Blueprint extension, as available via the odl-controller-blueprint feature is no longer transitively depended on by odl-mdsal-broker. This change impacts downstreams who still use Blueprint as well as the OpenDaylight extensions, like odl:type, odl:rpc-service and odl:clustered-app-config. Users who do not already explicitly pull in odl-controller-blueprint will need to add this dependency to their feature.xml definitions, otherwise their Blueprint containers will fail to activate – and thus fail SingleFeatureTest checks.

Distributed Datastore uses tell-based protocol by default

The default configuration of sal-distributed-datastore has been changed to default to use-tell-based-protocol=true in datastore.cfg. This protocol is now considered to be production-ready and its alternative, ask-based protocol, is considered legacy although there are no immediate plans to remove it.

This change also lowers maximum-message-slice-size to 480KiB and lowers Akka’s maximum-frame-size to  512KiB. This results in major reduction in native memory usage. Users switching back to ask-based protocol are advised to also adjust these (and perhaps akka-remoting) parameters accordingly.