sal-compatibility does not get up-to-date flow information.
This is the root cause of VTN-40.

InventoryAndReadAdapter class of sal-compatibility implements readAllFlow method.
List<FlowOnNode> readAllFlow(final Node node, final boolean cached).

When the second parameter "cached" is false, this method must get flow information directly from the hardware node, and return it.

https://jenkins.opendaylight.org/controller/job/controller-merge/lastSuccessfulBuild/artifact/target/apidocs/org/opendaylight/controller/sal/reader/IPluginInReadService.html#readAllFlow(org.opendaylight.controller.sal.core.Node,%20boolean)

However, the implementation of this method does not check the second parameter "cached", and it always returns cached information even if the second parameter "cached" is false.

InventoryAndReadAdapter.java
----------------------------

controller/opendaylight/md-sal/compatibility/sal-compatibility/src/main/java/org/opendaylight/controller/sal/compatibility/InventoryAndReadAdapter.java

253 @Override
254 public List<FlowOnNode> readAllFlow(final Node node, final boolean cached) {
255 final ArrayList<FlowOnNode> output = new ArrayList<>();
256 final Table table = readOperationalTable(node, OPENFLOWV10_TABLE_ID);
257 if (table != null) {
258 final List<Flow> flows = table.getFlow();
259 LOG.trace("Number of flows installed in table 0 of node {} : {}", node, flows.size());
260
261 for (final Flow flow : flows) {
262 final FlowStatisticsData statsFromDataStore = flow.getAugmentation(FlowStatisticsData.class);
263 if (statsFromDataStore != null)

{ 264 final FlowOnNode it = new FlowOnNode(ToSalConversionsUtils.toFlow(flow, node)); 265 output.add(addFlowStats(it, statsFromDataStore.getFlowStatistics())); 266 }

267 }
268 }
269
270 return output;
271 }