samarthjain commented on a change in pull request #7088: Improve parallelism of
zookeeper based segment change processing
URL: https://github.com/apache/incubator-druid/pull/7088#discussion_r277126584
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File path:
server/src/main/java/org/apache/druid/server/coordinator/CuratorLoadQueuePeon.java
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@@ -183,28 +172,17 @@ public void dropSegment(
final LoadPeonCallback callback
Review comment:
This class has been around forever and I agree that more could be done to
document the thread safety of the class. Having said that, I don't think this
PR should be focussing on it. It could possibly be addressed in
https://github.com/apache/incubator-druid/projects/4.
Looking at the callers of loadSegment() and dropSegment() I can't say for
sure if they could be called by multiple threads. It doesn't seem like it from
what I see. However, to better guard against future changes, I am going to
slightly change the code to use putIfAbsent instead of doing the racy
check-then-act.
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