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

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

The {@link BalancedShardsAllocator} re-balances the nodes allocationswithin an cluster based on a {@link WeightFunction}. The clusters balance is defined by four parameters which can be set in the cluster update API that allows changes in real-time:

cluster.routing.allocation.balance.shard - The shard balance defines the weight factor for shards allocated on a {@link RoutingNode}
cluster.routing.allocation.balance.index - The index balance defines a factor to the number of {@link org.elasticsearch.cluster.routing.ShardRouting}s per index allocated on a specific node
cluster.routing.allocation.balance.primary - the primary balance defines a weight factor for the number of primaries of a specific index allocated on a node
cluster.routing.allocation.balance.threshold - A threshold to set the minimal optimization value of operations that should be performed

These parameters are combined in a {@link WeightFunction} that allows calculation of node weights whichare used to re-balance shards based on global as well as per-index factors.

                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

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