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https://issues.apache.org/jira/browse/HBASE-21587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17575116#comment-17575116
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Duo Zhang commented on HBASE-21587:
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For HBase 2.x, the coprocessor related APIs still use protobuf 2.5, I'm not
sure if it will be a problem if you do not use CPs.
And what is the conflicts and compilation issues?
http://ci.hive.apache.org/job/hive-precommit/job/PR-3498/2/testReport/junit/org.apache.hadoop.hive.hbase/TestPutResultWritable/Testing___split_20___PostProcess___testPut/
This one? It seems that in hive you references the protobuf messages in HBase
directly. Usually this is not a good practise, but in general, it is true that
in the big hadoop ecosystem we always reference each others private classes...
https://github.com/apache/hive/blob/master/hbase-handler/src/java/org/apache/hadoop/hive/hbase/PutWritable.java
Here, in this class, please change to use the classes under
'org.apache.hadoop.hbase.shaded.protobuf' instead of
''org.apache.hadoop.hbase.protobuf'. Shout if you still have issues.
Thanks.
> Improve support for protobuf 3
> ------------------------------
>
> Key: HBASE-21587
> URL: https://issues.apache.org/jira/browse/HBASE-21587
> Project: HBase
> Issue Type: Improvement
> Reporter: Mya Pitzeruse
> Priority: Major
>
> {{HBaseZeroCopyByteString}} extends {{LiteralByteString}} which was removed
> in protobuf 3. The class was marked as package private, so hbase needed to do
> a package trick to get to the underlying class.
> [https://github.com/apache/hbase/blob/025ddce868eb06b4072b5152c5ffae5a01e7ae30/hbase-protocol/src/main/java/com/google/protobuf/HBaseZeroCopyByteString.java#L18]
> ejona86 references this problem in grpc-java:
> [https://github.com/grpc/grpc-java/issues/3035#issuecomment-360851817]
> The {{HBaseZeroCopyByteString}} class appears to only be used by
> {{ByteStringer}} class.
> [https://github.com/apache/hbase/blob/025ddce868eb06b4072b5152c5ffae5a01e7ae30/hbase-protocol/src/main/java/org/apache/hadoop/hbase/util/ByteStringer.java#L42-L49]
> I think a simple change can be made to the {{ByteStringer}} class to support
> both proto2 and proto3.
> Proto3 offers an {{UnsafeByteOperations}} class that can be used in place of
> the {{HBaseZeroCopyByteString}} class.
> [https://github.com/protocolbuffers/protobuf/blob/master/java/core/src/main/java/com/google/protobuf/UnsafeByteOperations.java#L97]
>
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