[HBASE-8479] AggregationClient breaks bigtop compile

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 0.95.1
• Component/s: build
• Assignee: Unassigned
• Reporter: Michael Stack
• Created: 02/May/13 05:22
• Updated: 16/Jun/22 17:00
• Resolved: 25/Jun/14 22:31

Description

With Roman, am trying to set up a bigtop ci of hbase 0.95 only we fail to compile. It is the exotic generics that are going on over in AggregateClient. Here is how we fail:

[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /mnt/jenkins/workspace/HBase-0.95/label/centos6/build/hbase/rpm/BUILD/hbase-0.95-SNAPSHOT/hbase-client/src/main/java/org/apache/hadoop/hbase/client/coprocessor/AggregationClient.java:[135,59] type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds Q,com.google.protobuf.Message
[ERROR] /mnt/jenkins/workspace/HBase-0.95/label/centos6/build/hbase/rpm/BUILD/hbase-0.95-SNAPSHOT/hbase-client/src/main/java/org/apache/hadoop/hbase/client/coprocessor/AggregationClient.java:[208,59] type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds Q,com.google.protobuf.Message
[ERROR] /mnt/jenkins/workspace/HBase-0.95/label/centos6/build/hbase/rpm/BUILD/hbase-0.95-SNAPSHOT/hbase-client/src/main/java/org/apache/hadoop/hbase/client/coprocessor/AggregationClient.java:[328,57] type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,com.google.protobuf.Message
[ERROR] /mnt/jenkins/workspace/HBase-0.95/label/centos6/build/hbase/rpm/BUILD/hbase-0.95-SNAPSHOT/hbase-client/src/main/java/org/apache/hadoop/hbase/client/coprocessor/AggregationClient.java:[390,57] type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,com.google.protobuf.Message
[ERROR] /mnt/jenkins/workspace/HBase-0.95/label/centos6/build/hbase/rpm/BUILD/hbase-0.95-SNAPSHOT/hbase-client/src/main/java/org/apache/hadoop/hbase/client/coprocessor/AggregationClient.java:[489,59] type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,com.google.protobuf.Message
[ERROR] /mnt/jenkins/workspace/HBase-0.95/label/centos6/build/hbase/rpm/BUILD/hbase-0.95-SNAPSHOT/hbase-client/src/main/java/org/apache/hadoop/hbase/client/coprocessor/AggregationClient.java:[591,59] type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,com.google.protobuf.Message
[INFO] 6 errors 

I cannot reproduce locally but googling, I see that above is pretty common complaint when you move between compilers. Various are the recommendations for fix but none definitive. The easiest is dumbing down the generics which I tried but it only caused issues in other coprocessors.

If clues on how to fix this, I'm all ears. Would like to get this bigtop ci build running. Its cool.