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| <h1 title="Package" class="title">Package org.apache.hadoop.hbase.master.balancer</h1> |
| </div> |
| <div class="contentContainer"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Interface Summary table, listing interfaces, and an explanation"> |
| <caption><span>Interface Summary</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Interface</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/ClusterInfoProvider.html" title="interface in org.apache.hadoop.hbase.master.balancer">ClusterInfoProvider</a></td> |
| <td class="colLast"> |
| <div class="block">This is the cluster we want to balance.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MetricsBalancerSource.html" title="interface in org.apache.hadoop.hbase.master.balancer">MetricsBalancerSource</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MetricsStochasticBalancerSource.html" title="interface in org.apache.hadoop.hbase.master.balancer">MetricsStochasticBalancerSource</a></td> |
| <td class="colLast"> |
| <div class="block">This interface extends the basic metrics balancer source to add a function |
| to report metrics that related to stochastic load balancer.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| <li class="blockList"> |
| <table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation"> |
| <caption><span>Class Summary</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/AssignRegionAction.html" title="class in org.apache.hadoop.hbase.master.balancer">AssignRegionAction</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalanceAction.html" title="class in org.apache.hadoop.hbase.master.balancer">BalanceAction</a></td> |
| <td class="colLast"> |
| <div class="block">An action to move or swap a region</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerChore.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerChore</a></td> |
| <td class="colLast"> |
| <div class="block">Chore that will call HMaster.balance<a href="../../../../../../org/apache/hadoop/hbase/master/HMaster.html#balance--"><code>HMaster.balance()</code></a> when |
| needed.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState</a></td> |
| <td class="colLast"> |
| <div class="block">An efficient array based implementation similar to ClusterState for keeping the status of the |
| cluster in terms of region assignment and distribution.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerClusterState.DefaultRackManager.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerClusterState.DefaultRackManager</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BalancerRegionLoad.html" title="class in org.apache.hadoop.hbase.master.balancer">BalancerRegionLoad</a></td> |
| <td class="colLast"> |
| <div class="block">Wrapper class for the few fields required by the <a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html" title="class in org.apache.hadoop.hbase.master.balancer"><code>StochasticLoadBalancer</code></a> |
| from the full <a href="../../../../../../org/apache/hadoop/hbase/RegionMetrics.html" title="interface in org.apache.hadoop.hbase"><code>RegionMetrics</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.html" title="class in org.apache.hadoop.hbase.master.balancer">BaseLoadBalancer</a></td> |
| <td class="colLast"> |
| <div class="block">The base class for load balancers.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CandidateGenerator.html" title="class in org.apache.hadoop.hbase.master.balancer">CandidateGenerator</a></td> |
| <td class="colLast"> |
| <div class="block">Generates a candidate action to be applied to the cluster for cost function search</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/ClusterLoadState.html" title="class in org.apache.hadoop.hbase.master.balancer">ClusterLoadState</a></td> |
| <td class="colLast"> |
| <div class="block">Class used to hold the current state of the cluster and how balanced it is.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/ClusterStatusChore.html" title="class in org.apache.hadoop.hbase.master.balancer">ClusterStatusChore</a></td> |
| <td class="colLast"> |
| <div class="block">Chore that will feed the balancer the cluster status.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFromRegionLoadAsRateFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">CostFromRegionLoadAsRateFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Class to be used for the subset of RegionLoad costs that should be treated as rates.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFromRegionLoadFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">CostFromRegionLoadFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Base class the allows writing costs functions from rolling average of some number from |
| RegionLoad.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">CostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Base class of StochasticLoadBalancer's Cost Functions.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/CPRequestCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">CPRequestCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Compute the cost of total number of coprocessor requests The more unbalanced the higher the |
| computed cost will be.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/DoubleArrayCost.html" title="class in org.apache.hadoop.hbase.master.balancer">DoubleArrayCost</a></td> |
| <td class="colLast"> |
| <div class="block">A helper class to compute a scaled cost using |
| <code>org.apache.commons.math3.stat.descriptive.DescriptiveStatistics#DescriptiveStatistics()</code>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/FavoredStochasticBalancer.html" title="class in org.apache.hadoop.hbase.master.balancer">FavoredStochasticBalancer</a></td> |
| <td class="colLast"> |
| <div class="block">An implementation of the <a href="../../../../../../org/apache/hadoop/hbase/master/LoadBalancer.html" title="interface in org.apache.hadoop.hbase.master"><code>LoadBalancer</code></a> that |
| assigns favored nodes for each region.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/HeterogeneousRegionCountCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">HeterogeneousRegionCountCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">This is an optional Cost function designed to allow region count skew across RegionServers.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/LoadBalancerFactory.html" title="class in org.apache.hadoop.hbase.master.balancer">LoadBalancerFactory</a></td> |
| <td class="colLast"> |
| <div class="block">The class that creates a load balancer from a conf.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/LoadCandidateGenerator.html" title="class in org.apache.hadoop.hbase.master.balancer">LoadCandidateGenerator</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/LocalityBasedCandidateGenerator.html" title="class in org.apache.hadoop.hbase.master.balancer">LocalityBasedCandidateGenerator</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/LocalityBasedCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">LocalityBasedCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Compute a cost of a potential cluster configuration based upon where |
| <a href="../../../../../../org/apache/hadoop/hbase/regionserver/HStoreFile.html" title="class in org.apache.hadoop.hbase.regionserver"><code>HStoreFile</code></a>s are located.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MaintenanceLoadBalancer.html" title="class in org.apache.hadoop.hbase.master.balancer">MaintenanceLoadBalancer</a></td> |
| <td class="colLast"> |
| <div class="block">a balancer which is only used in maintenance mode.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MasterClusterInfoProvider.html" title="class in org.apache.hadoop.hbase.master.balancer">MasterClusterInfoProvider</a></td> |
| <td class="colLast"> |
| <div class="block">Master based cluster info provider.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MemStoreSizeCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">MemStoreSizeCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Compute the cost of total memstore size.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MetricsBalancer.html" title="class in org.apache.hadoop.hbase.master.balancer">MetricsBalancer</a></td> |
| <td class="colLast"> |
| <div class="block">Faced for exposing metrics about the balancer.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MetricsBalancerSourceImpl.html" title="class in org.apache.hadoop.hbase.master.balancer">MetricsBalancerSourceImpl</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MetricsStochasticBalancer.html" title="class in org.apache.hadoop.hbase.master.balancer">MetricsStochasticBalancer</a></td> |
| <td class="colLast"> |
| <div class="block">This metrics balancer uses extended source for stochastic load balancer |
| to report its related metrics to JMX.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MetricsStochasticBalancerSourceImpl.html" title="class in org.apache.hadoop.hbase.master.balancer">MetricsStochasticBalancerSourceImpl</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MoveCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">MoveCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Given the starting state of the regions and a potential ending state compute cost based upon the |
| number of regions that have moved.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/MoveRegionAction.html" title="class in org.apache.hadoop.hbase.master.balancer">MoveRegionAction</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/PrimaryRegionCountSkewCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">PrimaryRegionCountSkewCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Compute the cost of a potential cluster state from skew in number of primary regions on a |
| cluster.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RackLocalityCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">RackLocalityCostFunction</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RandomCandidateGenerator.html" title="class in org.apache.hadoop.hbase.master.balancer">RandomCandidateGenerator</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/ReadRequestCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">ReadRequestCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Compute the cost of total number of read requests The more unbalanced the higher the computed |
| cost will be.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RegionCountSkewCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">RegionCountSkewCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Compute the cost of a potential cluster state from skew in number of regions on a cluster.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RegionHDFSBlockLocationFinder.html" title="class in org.apache.hadoop.hbase.master.balancer">RegionHDFSBlockLocationFinder</a></td> |
| <td class="colLast"> |
| <div class="block">This will find where data for a region is located in HDFS.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RegionInfoComparator.html" title="class in org.apache.hadoop.hbase.master.balancer">RegionInfoComparator</a></td> |
| <td class="colLast"> |
| <div class="block">The following comparator assumes that RegionId from HRegionInfo can represent |
| the age of the region - larger RegionId means the region is younger.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RegionReplicaCandidateGenerator.html" title="class in org.apache.hadoop.hbase.master.balancer">RegionReplicaCandidateGenerator</a></td> |
| <td class="colLast"> |
| <div class="block">Generates candidates which moves the replicas out of the region server for co-hosted region |
| replicas</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RegionReplicaGroupingCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">RegionReplicaGroupingCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">A cost function for region replicas.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RegionReplicaHostCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">RegionReplicaHostCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">A cost function for region replicas.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RegionReplicaRackCandidateGenerator.html" title="class in org.apache.hadoop.hbase.master.balancer">RegionReplicaRackCandidateGenerator</a></td> |
| <td class="colLast"> |
| <div class="block">Generates candidates which moves the replicas out of the rack for co-hosted region replicas in |
| the same rack</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/RegionReplicaRackCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">RegionReplicaRackCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">A cost function for region replicas for the rack distribution.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/ServerAndLoad.html" title="class in org.apache.hadoop.hbase.master.balancer">ServerAndLoad</a></td> |
| <td class="colLast"> |
| <div class="block">Data structure that holds servername and 'load'.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/ServerLocalityCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">ServerLocalityCostFunction</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/SimpleLoadBalancer.html" title="class in org.apache.hadoop.hbase.master.balancer">SimpleLoadBalancer</a></td> |
| <td class="colLast"> |
| <div class="block">Makes decisions about the placement and movement of Regions across RegionServers.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/SimpleLoadBalancer.BalanceInfo.html" title="class in org.apache.hadoop.hbase.master.balancer">SimpleLoadBalancer.BalanceInfo</a></td> |
| <td class="colLast"> |
| <div class="block">Stores additional per-server information about the regions added/removed |
| during the run of the balancing algorithm.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.html" title="class in org.apache.hadoop.hbase.master.balancer">StochasticLoadBalancer</a></td> |
| <td class="colLast"> |
| <div class="block">This is a best effort load balancer.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/StoreFileCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">StoreFileCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Compute the cost of total open storefiles size.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/SwapRegionsAction.html" title="class in org.apache.hadoop.hbase.master.balancer">SwapRegionsAction</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../org/apache/hadoop/hbase/master/balancer/TableSkewCostFunction.html" title="class in org.apache.hadoop.hbase.master.balancer">TableSkewCostFunction</a></td> |
| <td class="colLast"> |
| <div class="block">Compute the cost of a potential cluster configuration based upon how evenly distributed tables |
| are.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
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