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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15638) Shade protobuf
Date Fri, 30 Sep 2016 21:45:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15537173#comment-15537173
] 

stack commented on HBASE-15638:
-------------------------------

HBASE-16741 subtask is about enhancing the build step to add shading and pulling in of protobuf
lib srcs.

> Shade protobuf
> --------------
>
>                 Key: HBASE-15638
>                 URL: https://issues.apache.org/jira/browse/HBASE-15638
>             Project: HBase
>          Issue Type: Bug
>          Components: Protobufs
>            Reporter: stack
>            Assignee: stack
>            Priority: Critical
>         Attachments: 15638v2.patch, HBASE-15638.master.001.patch, HBASE-15638.master.002.patch,
HBASE-15638.master.003 (1).patch, HBASE-15638.master.003 (1).patch, HBASE-15638.master.003
(1).patch, HBASE-15638.master.003.patch, HBASE-15638.master.003.patch, HBASE-15638.master.004.patch,
HBASE-15638.master.005.patch, HBASE-15638.master.006.patch, HBASE-15638.master.007.patch,
HBASE-15638.master.007.patch, HBASE-15638.master.008.patch, HBASE-15638.master.009.patch,
as.far.as.server.patch
>
>
> We need to change our protobuf. Currently it is pb2.5.0. As is, protobufs expect all
buffers to be on-heap byte arrays. It does not have facility for dealing in ByteBuffers and
off-heap ByteBuffers in particular. This fact frustrates the off-heaping-of-the-write-path
project as marshalling/unmarshalling of protobufs involves a copy on-heap first.
> So, we need to patch our protobuf so it supports off-heap ByteBuffers. To ensure we pick
up the patched protobuf always, we need to relocate/shade our protobuf and adjust all protobuf
references accordingly.
> Given as we have protobufs in our public facing API, Coprocessor Endpoints -- which use
protobuf Service to describe new API -- a blind relocation/shading of com.google.protobuf.*
will break our API for CoProcessor EndPoints (CPEP) in particular. For example, in the Table
Interface, to invoke a method on a registered CPEP, we have:
> {code}<T extends com.google.protobuf.Service,R> Map<byte[],R> coprocessorService(
> Class<T> service, byte[] startKey, byte[] endKey,                             
               org.apache.hadoop.hbase.client.coprocessor.Batch.Call<T,R> callable)
> throws com.google.protobuf.ServiceException, Throwable{code}
> This issue is how we intend to shade protobuf for hbase-2.0.0 while preserving our API
as is so CPEPs continue to work on the new hbase.



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