vrajat commented on code in PR #12157:
URL: https://github.com/apache/pinot/pull/12157#discussion_r1473771585
##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/realtime/PinotLLCRealtimeSegmentManager.java:
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@@ -140,6 +142,8 @@ public class PinotLLCRealtimeSegmentManager {
// Max time to wait for all LLC segments to complete committing their
metadata while stopping the controller.
private static final long MAX_LLC_SEGMENT_METADATA_COMMIT_TIME_MILLIS =
30_000L;
+ private Map<Pair<String, String>, SegmentErrorInfo> _errorCache;
Review Comment:
I should limit its size. I am thinking of using a `LinkedHashMap` to limit
its entry. Similar to
https://docs.oracle.com/javase/8/docs/api/java/util/LinkedHashMap.html#removeEldestEntry-java.util.Map.Entry-
Is that OK?
However, these methods are not synchronized. I can use
[Collections.synchronizedMap](https://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#synchronizedMap-java.util.Map-)
to wrap the LinkedHashMap.
Also another minor improvement is to change the signature to
`getSegmentErrors(String tableName, String segmentName)`. Then iterators and
streams are not required and all the access will be through `get` which is
synchronized.
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