sabi0 commented on code in PR #13142:
URL: https://github.com/apache/lucene/pull/13142#discussion_r1505545772
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lucene/replicator/src/java/org/apache/lucene/replicator/nrt/PrimaryNode.java:
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@@ -158,10 +158,7 @@ public long getPrimaryGen() {
*/
public boolean flushAndRefresh() throws IOException {
message("top: now flushAndRefresh");
- Set<String> completedMergeFiles;
Review Comment:
Code here is written safely: it makes a copy of a shared set, processes the
copy and then removes the processed elements from the shared set.
I believe it should be fine.
Unlike, for instance something like this:
https://github.com/apache/lucene/blob/42269203cc553a1461ed0897b65f63acf4b375f2/lucene/replicator/src/java/org/apache/lucene/replicator/nrt/ReplicaNode.java#L698-L701
(Just an example, this code is also fine as all operations on the
'pendingMergeFiles' in that class are inside `synchronized (this)` blocks. But
this is rather fragile. It takes a single mutation outside 'synchronized' to
introduce a hard to find bug.)
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