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https://issues.apache.org/jira/browse/HADOOP-19864?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18074672#comment-18074672
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ASF GitHub Bot commented on HADOOP-19864:
-----------------------------------------
pan3793 commented on code in PR #8433:
URL: https://github.com/apache/hadoop/pull/8433#discussion_r3107022876
##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/RpcWritable.java:
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@@ -33,7 +33,14 @@
import org.apache.hadoop.thirdparty.protobuf.CodedOutputStream;
import org.apache.hadoop.thirdparty.protobuf.Message;
-// note anything marked public is solely for access by SaslRpcClient
+/**
+ * Marshalling support, for hadoop shaded protobuf and legacy
+ * protobuf 2.5.
Review Comment:
do you have a plan to cut protobuf 2.5 thoroughly?
protobuf 3-based ProtobufRpcEngine2 has been introduced in HADOOP-17046
(3.3.0, 6 years ago), also Hadoop 3.2 has reached EOL, I think we have already
given downstream projects enough time to allow them to migrate from protobuf
2.5 to protobuf 3.x seamlessly
> Cut WritableRPCEngine
> ---------------------
>
> Key: HADOOP-19864
> URL: https://issues.apache.org/jira/browse/HADOOP-19864
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 3.6.0
> Reporter: Steve Loughran
> Priority: Major
> Labels: pull-request-available
>
> Cut {{WritableRpcEngine}} from the code
> It's been obsolete for over a decade, with MAPREDUCE-6706 not needed
> internally.
> Tez still uses it (TEZ-4708 ) so this removal will be incompatible for them.
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