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Subject [GitHub] [incubator-openwhisk] rabbah commented on a change in pull request #4314: CosmosDB Cache Invalidation Service
Date Wed, 20 Mar 2019 15:29:05 GMT
rabbah commented on a change in pull request #4314: CosmosDB Cache Invalidation Service

 File path: core/cosmosdb/cache-invalidator/
 @@ -0,0 +1,67 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# OpenWhisk Cache Invalidator Service
+This service performs cache invalidation in OpenWhisk cluster to enable cache event propagation
in multi region setups.
+## Design
+OpenWhisk cluster uses a Kafka topic `cacheInvalidation` to communicate changes to any cached
entity. Messages on this
+topic are of the form
+When deploying multiple seprate cluster of OpenWhisk which do not share same Kafka instance
we would need a way to
+propagate the cache change event across cluster. For CosmosDB based setups this can be done
by using [CosmosDB ChangeFeed][1]
+support. It enables reading changes that are made to any specific collection.
+This service makes use of [change feed processor java][2] library and listen to changes happening
in `whisks` and `subject`
+collection and then convert them into Kafka message events which can be sent to `cacheInvalidation`
topic of local cluster
 Review comment:
    sent to `cacheInvalidation` topic of local cluster ->  sent to `cacheInvalidation`
topic local to the cluster.

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