Package org.apache.hadoop.hbase.master.balancer

Class TestStoreFileTableSkewCostFunction

java.lang.Object

org.apache.hadoop.hbase.master.balancer.TestStoreFileTableSkewCostFunction

public class TestStoreFileTableSkewCostFunction
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	TestStoreFileTableSkewCostFunction.DummyBalancerClusterState	A simplified BalancerClusterState which ensures we provide the intended test RegionMetrics data when balancing this cluster

Field Summary

Fields

Modifier and Type	Field	Description
static final HBaseClassTestRule	CLASS_RULE
private static final org.apache.hadoop.hbase.TableName	DEFAULT_TABLE
private static final Map<Long,Integer>	REGION_TO_STORE_FILE_SIZE_MB

Constructor Summary

Constructors

Constructor	Description
TestStoreFileTableSkewCostFunction()

Method Summary

Modifier and Type	Method	Description
private static org.apache.hadoop.hbase.client.RegionInfo	createMockRegionInfo(int storeFileSizeMb)	Helper method to create a RegionInfo for the default table with the given store file size.
private static org.apache.hadoop.hbase.client.RegionInfo	createMockRegionInfo(org.apache.hadoop.hbase.TableName table, int storeFileSizeMb)	Helper method to create a RegionInfo for a specified table with the given store file size.
private static org.apache.hadoop.hbase.RegionMetrics	createMockRegionMetrics(org.apache.hadoop.hbase.client.RegionInfo regionInfo)	Creates a mocked RegionMetrics for the given region.
private static byte[]	generateRandomByteArray(int n)
void	testEmptyDistribution()	Tests that an empty cluster (no servers/regions) is handled gracefully.
void	testMultipleTablesDistribution()	Tests that having multiple tables results in a positive cost when each table's regions are not balanced across servers – even if the overall load per server is balanced.
void	testSkewedDistribution()	Tests that a skewed store file distribution (single table) results in a positive cost.
void	testUniformDistribution()	Tests that a uniform store file distribution (single table) across servers results in zero cost.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

CLASS_RULE

public static final HBaseClassTestRule CLASS_RULE

DEFAULT_TABLE

private static final org.apache.hadoop.hbase.TableName DEFAULT_TABLE

REGION_TO_STORE_FILE_SIZE_MB

private static final Map<Long,Integer> REGION_TO_STORE_FILE_SIZE_MB

Constructor Details

TestStoreFileTableSkewCostFunction

public TestStoreFileTableSkewCostFunction()

Method Details

testUniformDistribution

public void testUniformDistribution()

Tests that a uniform store file distribution (single table) across servers results in zero cost.

testSkewedDistribution

public void testSkewedDistribution()

Tests that a skewed store file distribution (single table) results in a positive cost.

testEmptyDistribution

public void testEmptyDistribution()

Tests that an empty cluster (no servers/regions) is handled gracefully.

testMultipleTablesDistribution

public void testMultipleTablesDistribution()

Tests that having multiple tables results in a positive cost when each table's regions are not balanced across servers – even if the overall load per server is balanced.

createMockRegionInfo

private static org.apache.hadoop.hbase.client.RegionInfo createMockRegionInfo(int storeFileSizeMb)

Helper method to create a RegionInfo for the default table with the given store file size.

createMockRegionInfo

private static org.apache.hadoop.hbase.client.RegionInfo createMockRegionInfo(org.apache.hadoop.hbase.TableName table,
 int storeFileSizeMb)

Helper method to create a RegionInfo for a specified table with the given store file size.

generateRandomByteArray

private static byte[] generateRandomByteArray(int n)

createMockRegionMetrics

private static org.apache.hadoop.hbase.RegionMetrics createMockRegionMetrics(org.apache.hadoop.hbase.client.RegionInfo regionInfo)

Creates a mocked RegionMetrics for the given region.