Examples of org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator$WeightFunction

org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator

This class is the primary weight function used to create balanced over nodes and shards in the cluster. Currently this function has 3 properties:

index balance - balance property over shards per index
shard balance - balance property over shards per cluster
primary balance - balance property over primaries per cluster

Each of these properties are expressed as factor such that the properties factor defines the relative importance of the property for the weight function. For example if the weight function should calculate the weights only based on a global (shard) balance the index and primary balance can be set to 0.0 and will in turn have no effect on the distribution.

The weight per index is calculated based on the following formula:

weight_index(node, index) = indexBalance * (node.numShards(index) - avgShardsPerNode(index))
weight_node(node, index) = shardBalance * (node.numShards() - avgShardsPerNode)
weight_primary(node, index) = primaryBalance * (node.numPrimaries() - avgPrimariesPerNode)

weight(node, index) = weight_index(node, index) + weight_node(node, index) + weight_primary(node, index)

                assertNull("addListener was called twice while only one time was expected", listeners[0]);
                listeners[0] = listener;
            }


        };
        BalancedShardsAllocator allocator = new BalancedShardsAllocator(settings.build(), service);
        assertThat(allocator.getIndexBalance(), Matchers.equalTo(0.2f));
        assertThat(allocator.getShardBalance(), Matchers.equalTo(0.3f));
        assertThat(allocator.getPrimaryBalance(), Matchers.equalTo(0.5f));
        assertThat(allocator.getThreshold(), Matchers.equalTo(2.0f));


        settings = settingsBuilder();
        settings.put(ClusterRebalanceAllocationDecider.CLUSTER_ROUTING_ALLOCATION_ALLOW_REBALANCE, ClusterRebalanceAllocationDecider.ClusterRebalanceType.ALWAYS.toString());
        listeners[0].onRefreshSettings(settings.build());
        assertThat(allocator.getIndexBalance(), Matchers.equalTo(0.2f));
        assertThat(allocator.getShardBalance(), Matchers.equalTo(0.3f));
        assertThat(allocator.getPrimaryBalance(), Matchers.equalTo(0.5f));
        assertThat(allocator.getThreshold(), Matchers.equalTo(2.0f));


        settings = settingsBuilder();
        settings.put(BalancedShardsAllocator.SETTING_INDEX_BALANCE_FACTOR, 0.5);
        settings.put(BalancedShardsAllocator.SETTING_SHARD_BALANCE_FACTOR, 0.1);
        settings.put(BalancedShardsAllocator.SETTING_PRIMARY_BALANCE_FACTOR, 0.4);
        settings.put(BalancedShardsAllocator.SETTING_THRESHOLD, 3.0);
        listeners[0].onRefreshSettings(settings.build());
        assertThat(allocator.getIndexBalance(), Matchers.equalTo(0.5f));
        assertThat(allocator.getShardBalance(), Matchers.equalTo(0.1f));
        assertThat(allocator.getPrimaryBalance(), Matchers.equalTo(0.4f));
        assertThat(allocator.getThreshold(), Matchers.equalTo(3.0f));
    }

Examples of org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator$WeightFunction

Related Classes of org.elasticsearch.cluster.routing.allocation.allocator.BalancedShardsAllocator$WeightFunction