ashvina opened a new pull request #2821: Update Dhalion dependency version URL: https://github.com/apache/incubator-heron/pull/2821 Dhalion version 0.2.x has many api and feature improvements. For e.g. 1. Deep-nested hashmaps have been replaced with filter-friendly table structures. This reduces the code required to add new health policy components in Heron. 1. The new Dhalion version also adds a state cache which provides access to all the events created in the past. Event history is needed by some components, which earlier required to manage their own state. It will also be used to publish metrics required by Heron. 1. Provides execution checkpoint/timestamp to which all outputs can be tagged. 1. The new version also strictly enforces type of event a specific phase can create and uses a consistent structure for output generated from each phase. The PR includes updates to heron components according to the updated Dhalion api.
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