Coprocessor Support for Generic Interfaces
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Key: HBASE-3400
URL: https://issues.apache.org/jira/browse/HBASE-3400
Project: HBase
Issue Type: Bug
Affects Versions: 0.92.0
Reporter: Ed Kohlwey
Assignee: Ed Kohlwey
Attachments: HBASE-3400.patch
Coprocessors currently do not support generic interfaces because type erasure
makes their generic parameters appear as Objects to Invocation.java.
This can be overcome by writing out the parameters using their own types
(rather than the type parameters), and then separately writing the class names
for the type parameters. While it would be ideal to implement this in
Invocation.java, some other code seems to be relying on its write order and
doing so breaks other RPC code. The modification can, however, be implemented
in Exec.java instead.
The included patch modifies Invocation.java's fields to that they are protected
scope, and fully implements the read and write methods for Exec rather than
using the parent method for the parent fields. ExecResult is also modified to
accommodate generic returns in the same way.
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