Grant Henke has posted comments on this change. ( 
http://gerrit.cloudera.org:8080/14329 )

Change subject: [java] KUDU-2791: process communicates via protobuf-based 
protocol
......................................................................


Patch Set 1:

(8 comments)

I did a quick first pass. I think the overall approach looks good.

http://gerrit.cloudera.org:8080/#/c/14329/1//COMMIT_MSG
Commit Message:

http://gerrit.cloudera.org:8080/#/c/14329/1//COMMIT_MSG@15
PS1, Line 15: (with optional JSON encoding)
> Looked at your other patch, and I now get what you mean that you want to ke
I agree I don't see a strong need for it. We could remove all the configuration 
code and json code without it. It also simplifies the test matrix.


http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/build.gradle
File java/kudu-subprocess/build.gradle:

http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/build.gradle@26
PS2, Line 26:   compile libs.slf4jsimple
What is slf4jsimple required for?


http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/EchoProtocolProcessor.java
File 
java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/EchoProtocolProcessor.java:

http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/EchoProtocolProcessor.java@27
PS2, Line 27: // Unless required by applicable law or agreed to in writing,
Should we added Private annotations to all of these classes to make sure no 
ones tries to use them?


http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/MessageConsumer.java
File 
java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/MessageConsumer.java:

http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/MessageConsumer.java@95
PS2, Line 95:             break;
Maybe use a while loop?  A for loop without an index initialization is fairly 
uncommon.


http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/MessageProducer.java
File 
java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/MessageProducer.java:

http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/MessageProducer.java@96
PS2, Line 96:           try {
Is this an exceptional occurrence? When would the message be empty?


http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/SubprocessMain.java
File 
java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/SubprocessMain.java:

http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/SubprocessMain.java@41
PS2, Line 41:   private static final int QUEUE_SIZE = 100;
How was this size chosen?


http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/SubprocessRuntimeException.java
File 
java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/SubprocessRuntimeException.java:

http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/java/org/apache/kudu/subprocess/SubprocessRuntimeException.java@23
PS2, Line 23: final class SubprocessRuntimeException extends RuntimeException {
Maybe make this clearly Kudu related. `KuduSubprocessException`.


http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/resources/log4j.properties
File java/kudu-subprocess/src/main/resources/log4j.properties:

http://gerrit.cloudera.org:8080/#/c/14329/2/java/kudu-subprocess/src/main/resources/log4j.properties@1
PS2, Line 1: log4j.debug=true
Match the log4j2.properties files like in all other modules.



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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: Iaf9ad24dbc9acc681284b6433836271b5b4c7982
Gerrit-Change-Number: 14329
Gerrit-PatchSet: 1
Gerrit-Owner: Hao Hao <[email protected]>
Gerrit-Reviewer: Andrew Wong <[email protected]>
Gerrit-Reviewer: Attila Bukor <[email protected]>
Gerrit-Reviewer: Grant Henke <[email protected]>
Gerrit-Reviewer: Hao Hao <[email protected]>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Comment-Date: Mon, 21 Oct 2019 16:03:06 +0000
Gerrit-HasComments: Yes

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