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Andras Piros commented on OOZIE-2339: ------------------------------------- [~rkanter] updated specification accordingly. > Use JAXB to provide a Java interface for writing Jobs based on the XSD schemas > ------------------------------------------------------------------------------ > > Key: OOZIE-2339 > URL: https://issues.apache.org/jira/browse/OOZIE-2339 > Project: Oozie > Issue Type: New Feature > Components: client > Affects Versions: trunk > Reporter: Robert Kanter > > Users often complain about the XML they have to write for Oozie jobs. It > would be nice if they could write them in something like Java, but we don't > want to have to maintain a separate Java API for this. I was looking around > and saw that JAXB might be the right thing here. From what I can tell, it > lets you create Java classes from XSD schemas. So, we should be able to > auto-generate a Java API for writing Oozie jobs, without having to really > maintain it. > We should investigate if this is feasible and, if so, implement it. > Some useful looking links: > * [JAXB > overview|https://en.wikipedia.org/wiki/Java_Architecture_for_XML_Binding] > * [JAXB description|https://jaxb.java.net/2.2.11/docs/ch03.html] > * [Maven JAXB plugin|https://java.net/projects/maven-jaxb2-plugin/pages/Home] > * [Apache Falcon|https://falcon.apache.org] > Key features: > * must have: > ** inside an {{oozie-jobs-api}} artifact > ** able to create workflow / coordinator / bundle definitions programmatically > ** synchronizing each and every XSD change on rebuild > ** can write {{workflow.xml}}, {{coordinator.xml}}, {{bundle.xml}}, and > {{jobs.properties}} artifacts of every XSD version > ** cloneability of workflow etc. {{Object}} s > ** perform cross checks, e.g. that the workflow graph is a DAG > ** only latest XSD versions should be supported as must have > * nice to have: > ** XSD version(s) can be provided. When not provided, latest ones are > considered as valid > ** implement a [*fluent API*|https://en.wikipedia.org/wiki/Fluent_interface] > ** have a Python / Jython REPL to make it easy to experiment > ** create documentation about usage > ** can read {{workflow.xml}}, {{coordinator.xml}}, {{bundle.xml}}, and > {{jobs.properties}} artifacts of every XSD version > ** can convert between XSD versions > ** support XSD change on the fly (within REPL) > ** support HDFS reads / writes > ** support dry run on an Oozie server to perform checks -- This message was sent by Atlassian JIRA (v6.3.15#6346)