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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11819) Unit test for CoprocessorHConnection
Date Fri, 10 Oct 2014 21:16:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14167525#comment-14167525
] 

Andrew Purtell commented on HBASE-11819:
----------------------------------------

Hi [~talat], you would want to do something like:
- Create a new Medium test.
- Make a mocked coprocessor for the test. Have a look at some of the existing coprocessor
unit tests for code examples. This coprocessor should have a test method that uses CoprocessorHConnection
to connect to the test table and do a get from the region hosted locally.
- Initialize the minicluster with 3 slaves.
- Create a table with some data in it that has at least 3 regions, register the mocked coprocessor
as a table coprocessor on this table.
- Verify the table regions are all assigned to different regionservers.
- Use the HBaseTestingUtility to get a handle to one regionserver. Get its coprocessor host
and look up the coprocessor instance running there. Your coprocessor will know what region
it is running on. You can get it using RegionCoprocessorEnvironment#getRegion. This will return
a HRegion object. Use HRegion#getStartKey to find the start key for this region. 
- Invoke the test method of your coprocessor instance, passing the start key for the region.
The test method should use this start key for a Get on the CoprocessorHConnection. Confirm
that some data was actually returned.

The above would test for the bugfix on HBASE-11766.

I think we would also want an additional unit test that confirms the short circuit path was
taken, but that would be more difficult to achieve so does not have to be done in the context
of this issue. 

> Unit test for CoprocessorHConnection 
> -------------------------------------
>
>                 Key: HBASE-11819
>                 URL: https://issues.apache.org/jira/browse/HBASE-11819
>             Project: HBase
>          Issue Type: Test
>            Reporter: Andrew Purtell
>            Assignee: Talat UYARER
>            Priority: Minor
>              Labels: newbie++
>             Fix For: 2.0.0, 0.98.8, 0.99.1
>
>
> Add a unit test to hbase-server that exercises CoprocessorHConnection . 



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