[HADOOP-18487] Make protobuf 2.5 an optional runtime dependency. - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: 3.3.4
Fix Version/s: 3.4.0, 3.3.9, 3.5.0
Component/s: build, ipc
Labels:
- pull-request-available

Target Version/s:

3.4.0, 3.3.7
Hadoop Flags:

Incompatible change
Release Note:

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hadoop modules no longer export protobuf-2.5.0 as a dependency, and it is omitted from the hadoop distribution directory. Applications which use the library must declare an explicit dependency.

Hadoop uses a shaded version of protobuf3 internally, and does not use the 2.5.0 JAR except when compiling compatible classes. It is still included in the binary distributions when the yarn timeline server is built with hbase 1

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hadoop modules no longer export protobuf-2.5.0 as a dependency, and it is omitted from the hadoop distribution directory. Applications which use the library must declare an explicit dependency. Hadoop uses a shaded version of protobuf3 internally, and does not use the 2.5.0 JAR except when compiling compatible classes. It is still included in the binary distributions when the yarn timeline server is built with hbase 1

Description

uses of protobuf 2.5 and RpcEnginej have been deprecated since 3.3.0 in ~~HADOOP-17046~~

while still keeping those files around (for a long time...), how about we make the protobuf 2.5.0 export off hadoop common and hadoop-hdfs provided, rather than compile

that way, if apps want it for their own apis, they have to explicitly ask for it, but at least our own scans don't break.

i have no idea what will happen to the rest of the stack at this point, it will be "interesting" to see