[GitHub] [incubator-druid] jon-wei commented on a change in pull request #7206: Add the pull-request template

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jon-wei commented on a change in pull request #7206: Add the pull-request template
URL: https://github.com/apache/incubator-druid/pull/7206#discussion_r276880835
 
 

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 File path: dev/code-review/concurrency.md
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 @@ -0,0 +1,178 @@
+## Druid's Checklist for Concurrency Code
+
+Design
+ - [Concurrency is rationalized in the PR description?](
+ https://github.com/code-review-checklists/java-concurrency#rationalize)
+ - [Can use patterns to simplify concurrency?](https://github.com/code-review-checklists/java-concurrency#use-patterns)
+   - Immutability/Snapshotting
+   - Divide and conquer
+   - Producer-consumer
+   - Instance confinement
+   - Thread/Task/Serial thread confinement
+
+Documentation
+ - [Thread-safety is justified in comments?](
+ https://github.com/code-review-checklists/java-concurrency#justify-document)
+ - [Class (method, field) has concurrent access documentation?](
+ https://github.com/code-review-checklists/java-concurrency#justify-document)
+ - [Threading model of a subsystem (class) is described?](
+ https://github.com/code-review-checklists/java-concurrency#threading-flow-model)
+ - [Concurrent control flow (or data flow) of a subsystem (class) is described?](
+ https://github.com/code-review-checklists/java-concurrency#threading-flow-model)
+ - [Class is documented as immutable, thread-safe, or not thread-safe?](
+ https://github.com/code-review-checklists/java-concurrency#immutable-thread-safe)
+ - [Applied concurrency patterns are pronounced?](
+ https://github.com/code-review-checklists/java-concurrency#name-patterns)
+ - [`@GuardedBy` annotation is used?](https://github.com/code-review-checklists/java-concurrency#guarded-by)
+ - [Safety of benign races is explained?](
+ https://github.com/code-review-checklists/java-concurrency#document-benign-race)
+ - [Each use of `volatile` is justified?](
+ https://github.com/code-review-checklists/java-concurrency#justify-volatile)
+ - [Field that is neither `volatile` nor annotated with `@GuardedBy` has a comment?](
+ https://github.com/code-review-checklists/java-concurrency#plain-field)
+
+Excessive thread safety
+ - [No "extra" (pseudo) thread safety?](https://github.com/code-review-checklists/java-concurrency#pseudo-safety)
+ - [No atomics on which only `get()` and `set()` are called?](
+ https://github.com/code-review-checklists/java-concurrency#redundant-atomics)
+ - [Class (method) needs to be thread-safe?](
+ https://github.com/code-review-checklists/java-concurrency#unneeded-thread-safety)
+
+Race conditions
+ - [No `put()` or `remove()` calls on a `ConcurrentHashMap` after `get()` or `containsKey()`?](
+ https://github.com/code-review-checklists/java-concurrency#chm-race)
 
 Review comment:
   I think the wording on some of the checklist items could be made clearer, e.g.:
   
   ```
   # RC.1. Aren’t ConcurrentHashMaps updated with multiple separate containsKey(), get(), put() and remove() calls instead of a single call to compute()/computeIfAbsent()/computeIfPresent()/replace()?
   ```
   
   From that it's somewhat ambiguous as to which one is the positive recommendation, I think would be clearer if phrased as:
   
   ```
   # RC.1. ConcurrentHashMaps should be updated with a single call to compute()/computeIfAbsent()/computeIfPresent()/replace() instead of with multiple separate containsKey(), get(), put() and remove() calls
   ```
   
   and for places with similar use of "aren't".

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