jackjlli commented on code in PR #11953:
URL: https://github.com/apache/pinot/pull/11953#discussion_r1419760987
##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/assignment/instance/InstanceTagPoolSelector.java:
##########
@@ -109,11 +121,46 @@ public Map<Integer, List<InstanceConfig>>
selectInstances(List<InstanceConfig> i
return poolToInstanceConfigsMap;
}
- // Select pools based on the table name hash to evenly distribute the
tables
poolsToSelect = new ArrayList<>(numPoolsToSelect);
- List<Integer> poolsInCluster = new ArrayList<>(pools);
- for (int i = 0; i < numPoolsToSelect; i++) {
- poolsToSelect.add(poolsInCluster.get((tableNameHash + i) %
numPools));
+ if (_minimizeDataMovement && _existingInstancePartitions != null) {
+ Set<Integer> existingPools = new TreeSet<>();
+ // Keep the same pool if it's already been used for the table.
+ int existingNumPartitions =
_existingInstancePartitions.getNumPartitions();
+ int existingNumReplicaGroups =
_existingInstancePartitions.getNumReplicaGroups();
+ for (int replicaGroupId = 0; replicaGroupId <
existingNumReplicaGroups; replicaGroupId++) {
+ boolean foundExistingPoolForReplicaGroup = false;
+ for (int partitionId = 0; partitionId < existingNumPartitions &
!foundExistingPoolForReplicaGroup;
+ partitionId++) {
+ List<String> existingInstances =
_existingInstancePartitions.getInstances(partitionId, replicaGroupId);
+ for (String existingInstance : existingInstances) {
+ Integer existingPool = instanceToPoolMap.get(existingInstance);
+ if (existingPool != null) {
+ if (existingPools.add(existingPool)) {
+ poolsToSelect.add(existingPool);
+ }
+ foundExistingPoolForReplicaGroup = true;
+ break;
+ }
+ }
+ }
+ }
+ LOGGER.info("Keep the same pool: {} for table: {}", existingPools,
_tableNameWithType);
+ // Pick a pool from remainingPools that isn't used before.
+ List<Integer> remainingPools = new ArrayList<>(pools);
+ remainingPools.retainAll(existingPools);
+ // Skip selecting the existing pool.
+ for (int i = 0; i < numPoolsToSelect; i++) {
+ if (existingPools.contains(i)) {
Review Comment:
Updated the logic to select from the remaining pools.
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