(kafka) branch trunk updated: MINOR: Move candidateClients set creation outside of task loop for StickyTaskAssignor (#19511)

[mjsax]

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mjsax pushed a commit to branch trunk
in repository https://gitbox.apache.org/repos/asf/kafka.git


The following commit(s) were added to refs/heads/trunk by this push:
     new 009fc7cdbf5 MINOR: Move candidateClients set creation outside of task 
loop for StickyTaskAssignor (#19511)
009fc7cdbf5 is described below

commit 009fc7cdbf50f5556af84366ab18e1ec877fa130
Author: lorcan <lorcan.ja...@yahoo.com>
AuthorDate: Wed Apr 30 18:22:04 2025 +0100

    MINOR: Move candidateClients set creation outside of task loop for 
StickyTaskAssignor (#19511)
    
    This PR moves the computation of the "client list", which is the same
    for all tasks,  out of the loop, to avoid unnecessary re-computation.
    
    Reviewers: Matthias J. Sax <matth...@confluent.io>
---
 .../streams/processor/assignment/assignors/StickyTaskAssignor.java    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git 
a/streams/src/main/java/org/apache/kafka/streams/processor/assignment/assignors/StickyTaskAssignor.java
 
b/streams/src/main/java/org/apache/kafka/streams/processor/assignment/assignors/StickyTaskAssignor.java
index eb164e2b27f..6ad61851dda 100644
--- 
a/streams/src/main/java/org/apache/kafka/streams/processor/assignment/assignors/StickyTaskAssignor.java
+++ 
b/streams/src/main/java/org/apache/kafka/streams/processor/assignment/assignors/StickyTaskAssignor.java
@@ -178,10 +178,10 @@ public class StickyTaskAssignor implements TaskAssignor {
         // assign any remaining unassigned tasks
         final List<TaskId> sortedTasks = new ArrayList<>(unassigned);
         Collections.sort(sortedTasks);
-        for (final TaskId taskId : sortedTasks) {
-            final Set<ProcessId> candidateClients = clients.stream()
+        final Set<ProcessId> candidateClients = clients.stream()
                 .map(KafkaStreamsState::processId)
                 .collect(Collectors.toSet());
+        for (final TaskId taskId : sortedTasks) {
             final ProcessId bestClient = 
assignmentState.findBestClientForTask(taskId, candidateClients);
             assignmentState.finalizeAssignment(taskId, bestClient, 
AssignedTask.Type.ACTIVE);
         }