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https://issues.apache.org/jira/browse/YARN-4985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15859912#comment-15859912
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Haibo Chen commented on YARN-4985:
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The dependency is not mainly because all tests are in the hbase-server module
as they are now, but because FlowScanner needs to reference FlowRun table
schema classes. If we were to extract another module that only includes
table/column definitions, we can avoid the dependency from hbase-server on
hbase-client. But hbase-client code seems quite coupled to the table schema
code due to current code implementation (read & write methods are defined
within the Table/Column classes). I will try to break the current hbase-client
module in my patch into hbase-schema and hbase-client. This way, we should not
have the undesirable dependency any more.
That said, I think my previous concern about loading coprocessor from HDFS is
still valid, since we will still have hbase-server depend on hbase-schema.
> Refactor the coprocessor code & other definition classes into independent
> packages
> ----------------------------------------------------------------------------------
>
> Key: YARN-4985
> URL: https://issues.apache.org/jira/browse/YARN-4985
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelineserver
> Reporter: Vrushali C
> Assignee: Haibo Chen
> Labels: YARN-5355
> Attachments: YARN-4985-YARN-5355.prelim.patch
>
>
> As part of the coprocessor deployment, we have realized that it will be much
> cleaner to have the coprocessor code sit in a package which does not depend
> on hadoop-yarn-server classes. It only needs hbase and other util classes.
> These util classes and tag definition related classes can be refactored into
> their own independent "definition" class package so that making changes to
> coprocessor code, upgrading hbase, deploying hbase on a different hadoop
> version cluster etc all becomes operationally much easier and less error
> prone to having different library jars etc.
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