From 4c551ca5ef2a410d9d8243721eecfaff3f1e1dcd Mon Sep 17 00:00:00 2001 From: RS146BIJAY Date: Mon, 15 Jul 2024 14:51:58 +0530 Subject: [PATCH] Optmising AwarenessAllocationDecider for hashmap.get call Signed-off-by: RS146BIJAY --- .../decider/AwarenessAllocationDecider.java | 91 ++++++++++++------- 1 file changed, 58 insertions(+), 33 deletions(-) diff --git a/server/src/main/java/org/opensearch/cluster/routing/allocation/decider/AwarenessAllocationDecider.java b/server/src/main/java/org/opensearch/cluster/routing/allocation/decider/AwarenessAllocationDecider.java index 5344d95b217a7..16c94acfbb553 100644 --- a/server/src/main/java/org/opensearch/cluster/routing/allocation/decider/AwarenessAllocationDecider.java +++ b/server/src/main/java/org/opensearch/cluster/routing/allocation/decider/AwarenessAllocationDecider.java @@ -111,7 +111,6 @@ public class AwarenessAllocationDecider extends AllocationDecider { ); private volatile List awarenessAttributes; - private volatile Map> forcedAwarenessAttributes; public AwarenessAllocationDecider(Settings settings, ClusterSettings clusterSettings) { @@ -163,8 +162,8 @@ private Decision underCapacity(ShardRouting shardRouting, RoutingNode node, Rout IndexMetadata indexMetadata = allocation.metadata().getIndexSafe(shardRouting.index()); int shardCount = indexMetadata.getNumberOfReplicas() + 1; // 1 for primary for (String awarenessAttribute : awarenessAttributes) { - // the node the shard exists on must be associated with an awareness attribute - if (node.node().getAttributes().containsKey(awarenessAttribute) == false) { + // the node the shard exists on must be associated with an awareness attribute. + if (isAwarenessAttributeAssociatedWithNode(node, awarenessAttribute) == false) { return allocation.decision( Decision.NO, NAME, @@ -175,36 +174,10 @@ private Decision underCapacity(ShardRouting shardRouting, RoutingNode node, Rout ); } + int currentNodeCount = getCurrentNodeCountForAttribute(shardRouting, node, allocation, moveToNode, awarenessAttribute); + // build attr_value -> nodes map Set nodesPerAttribute = allocation.routingNodes().nodesPerAttributesCounts(awarenessAttribute); - - // build the count of shards per attribute value - Map shardPerAttribute = new HashMap<>(); - for (ShardRouting assignedShard : allocation.routingNodes().assignedShards(shardRouting.shardId())) { - if (assignedShard.started() || assignedShard.initializing()) { - // Note: this also counts relocation targets as that will be the new location of the shard. - // Relocation sources should not be counted as the shard is moving away - RoutingNode routingNode = allocation.routingNodes().node(assignedShard.currentNodeId()); - shardPerAttribute.merge(routingNode.node().getAttributes().get(awarenessAttribute), 1, Integer::sum); - } - } - - if (moveToNode) { - if (shardRouting.assignedToNode()) { - String nodeId = shardRouting.relocating() ? shardRouting.relocatingNodeId() : shardRouting.currentNodeId(); - if (node.nodeId().equals(nodeId) == false) { - // we work on different nodes, move counts around - shardPerAttribute.compute( - allocation.routingNodes().node(nodeId).node().getAttributes().get(awarenessAttribute), - (k, v) -> (v == null) ? 0 : v - 1 - ); - shardPerAttribute.merge(node.node().getAttributes().get(awarenessAttribute), 1, Integer::sum); - } - } else { - shardPerAttribute.merge(node.node().getAttributes().get(awarenessAttribute), 1, Integer::sum); - } - } - int numberOfAttributes = nodesPerAttribute.size(); List fullValues = forcedAwarenessAttributes.get(awarenessAttribute); @@ -216,9 +189,8 @@ private Decision underCapacity(ShardRouting shardRouting, RoutingNode node, Rout } numberOfAttributes = attributesSet.size(); } - // TODO should we remove ones that are not part of full list? - final int currentNodeCount = shardPerAttribute.get(node.node().getAttributes().get(awarenessAttribute)); + // TODO should we remove ones that are not part of full list? final int maximumNodeCount = (shardCount + numberOfAttributes - 1) / numberOfAttributes; // ceil(shardCount/numberOfAttributes) if (currentNodeCount > maximumNodeCount) { return allocation.decision( @@ -238,4 +210,57 @@ private Decision underCapacity(ShardRouting shardRouting, RoutingNode node, Rout return allocation.decision(Decision.YES, NAME, "node meets all awareness attribute requirements"); } + + private int getCurrentNodeCountForAttribute( + ShardRouting shardRouting, + RoutingNode node, + RoutingAllocation allocation, + boolean moveToNode, + String awarenessAttribute + ) { + // build the count of shards per attribute value + final String shardAttributeForNode = getAttributeValueForNode(node, awarenessAttribute); + int currentNodeCount = 0; + final List assignedShards = allocation.routingNodes().assignedShards(shardRouting.shardId()); + + for (ShardRouting assignedShard : assignedShards) { + if (assignedShard.started() || assignedShard.initializing()) { + // Note: this also counts relocation targets as that will be the new location of the shard. + // Relocation sources should not be counted as the shard is moving away + RoutingNode routingNode = allocation.routingNodes().node(assignedShard.currentNodeId()); + // Increase node count when + if (getAttributeValueForNode(routingNode, awarenessAttribute).equals(shardAttributeForNode)) { + ++currentNodeCount; + } + } + } + + if (moveToNode) { + if (shardRouting.assignedToNode()) { + String nodeId = shardRouting.relocating() ? shardRouting.relocatingNodeId() : shardRouting.currentNodeId(); + if (node.nodeId().equals(nodeId) == false) { + // we work on different nodes, move counts around + if (getAttributeValueForNode(allocation.routingNodes().node(nodeId), awarenessAttribute).equals(shardAttributeForNode) + && currentNodeCount > 0) { + --currentNodeCount; + } + + ++currentNodeCount; + } + } else { + ++currentNodeCount; + } + } + + return currentNodeCount; + } + + private boolean isAwarenessAttributeAssociatedWithNode(RoutingNode node, String awarenessAttribute) { + return node.node().getAttributes().containsKey(awarenessAttribute); + } + + private String getAttributeValueForNode(final RoutingNode node, final String awarenessAttribute) { + return node.node().getAttributes().get(awarenessAttribute); + } + }