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https://issues.apache.org/jira/browse/HDDS-446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16614201#comment-16614201
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Bharat Viswanadham commented on HDDS-446:
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Hi [~elek]
Thanks for providing the patch.
I have few questions in trying to understand this patch. As I have not got
complete context, just trying to understand the purpose of this patch.
# With this patch, now we can copy the hadoop-ozone-datanode-plugin.jar to
hdfs cluster and make ozone work? (But still we require other ozone jars). So,
what will be the advantage of this?
# In the patch in docker-compose, we have started datanode as hdfs datanode,
and added org.apache.hadoop.ozone.web.OzoneHddsDatanodeService. So, this is for
testing ozone running as a datanode plugin only right?
# And in pom.xml Line:87, instead of mentioning version 3.1.1, we can use
maven-shade-plugin.version from hadoop-project pom.xml, but that is specified
too old, 2.4.3, if we want we change this one.
# And in ozone-dist-layout-stitching, we are copying the
hadoop-ozone-objectstore-service-${HDDS_VERSION}-plugin.jar as
hadoop-ozone-datanode-plugin.jar with out any version. Is this intentional
change, as I see same for hadoop-ozone-filesystem.jar also. If so, why this is
done?
> Provide shaded artifact to start ozone service as a datanode plugin
> -------------------------------------------------------------------
>
> Key: HDDS-446
> URL: https://issues.apache.org/jira/browse/HDDS-446
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Reporter: Elek, Marton
> Assignee: Elek, Marton
> Priority: Major
> Fix For: 0.2.1
>
> Attachments: HDDS-446-ozone-0.2.001.patch
>
>
> Ozone datanode service could be started in two different way:
> # as a standalone process
> # as a datanode plugin
> We tested the second scenarion by compiling both ozone + hadoop trunk
> together and created a combined artifact. But we have no more full hadoop
> distribution in the ozone release package any more. And we had no answer how
> it could be started with an existing hadoop release.
> We need a well defined way to add the datanode-service to the classpath of
> the hadoop datanode.
> I propose here to create a lightweight shaded artifact (and here the shading
> only combines all the classes together without package name refactoring) to
> make it easier to extend an existing hadoop installation.
> In this patch I add the shade plugin execution to the ozone
> objectstore-service and the shaded file will be copied to the distribution.
> A new docker-compose based execution environment (ozone-hdfs)
> demonstrates/tests how it could work.
> Tested with hadoop 3.1.0 and datanode service could be started without any
> problem
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