richardstartin commented on a change in pull request #8443:
URL: https://github.com/apache/pinot/pull/8443#discussion_r840059306
##########
File path:
pinot-core/src/main/java/org/apache/pinot/core/util/trace/TraceContext.java
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@@ -67,7 +68,7 @@ JsonNode toJson() {
final String _traceId;
final List<LogEntry> _logs = new ArrayList<>();
- int _numChildren = 0;
+ AtomicInteger _numChildren = new AtomicInteger(0);
Review comment:
It can be useful to save memory and indirections with
`Atomic*FieldUpdater`s, you can use one as follows:
```java
private static final AtomicIntegerFieldUpdater<Trace> UPDATER =
AtomicIntegerFieldUpdater.newUpdater(Trace.class, "_numChildren");
private volatile int _numChildren;
...
return _traceId + "_" + UPDATER.getAndIncrement(this);
```
At the very least, please make `_numChildren` final if it remains an
`AtomicInteger`
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