[jira] [Created] (HBASE-26524) Support remove coprocessor by class name via alter table command

["Tak-Lon (Stephen) Wu (Jira)" <ji...@apache.org>]

Tak-Lon (Stephen) Wu created HBASE-26524:
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             Summary: Support remove coprocessor by class name via alter table command
                 Key: HBASE-26524
                 URL: https://issues.apache.org/jira/browse/HBASE-26524
             Project: HBase
          Issue Type: Improvement
          Components: Coprocessors, shell
    Affects Versions: 2.5.0, 3.0.0-alpha-2
            Reporter: Tak-Lon (Stephen) Wu


With the shell, when operator wants to remove a table coprocessor, the flow is to

1. first use {{decs}} find the the mapping of coprocessor$# e.g. coprocessor$1, where # is the ordered number when the coprocessor was internally added to the table attribute 
2. issue {{table_att_unset}} with the target `coprocessor$#` that maps to a value that include the unique class name.

This task is to simplify the flow if the operator know exactly the class name of the added coprocessor, and create a new sub-method to {{alter}}, such that operator can do it only with the class name. 

NOTE that this logic has been added behind the scenes at [TableDescriptorBuilder#removeCoprocessor](https://github.com/apache/hbase/blob/358c4dc9022c507ee0159c1d4916aba41d42cde8/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java#L1537-L1565) for removing `ConstraintProcessor` , and we are just exposing this logic with a new method to {{alter}} command. 




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