org.apache.ignite.internal.processors.query.stat

Class IgniteStatisticsHelper

java.lang.Object

org.apache.ignite.internal.processors.query.stat.IgniteStatisticsHelper

public class IgniteStatisticsHelper
extends Object

Utility methods to statistics messages generation.

Constructor Summary

Constructors

Constructor and Description
IgniteStatisticsHelper(UUID locNodeId, SchemaManager schemaMgr, Function<Class<?>,IgniteLogger> logSupplier) Constructor.

Method Summary

Modifier and Type	Method and Description
static ObjectStatisticsImpl	aggregateLocalStatistics(GridQueryTypeDescriptor tbl, StatisticsObjectConfiguration cfg, Collection<? extends ObjectStatisticsImpl> stats, IgniteLogger log) Aggregate partition level statistics to local level one or local statistics to global one.
ObjectStatisticsImpl	aggregateLocalStatistics(StatisticsObjectConfiguration cfg, Collection<? extends ObjectStatisticsImpl> stats) Aggregate specified partition level statistics to local level statistics.
static StatisticsObjectConfiguration[]	buildDefaultConfigurations(StatisticsTarget... targets) Build object configurations array with all default parameters from specified targets.
static long	calculateRowCount(StatisticsObjectConfiguration cfg, long actualRowCount) Calculate effective row count.
static List<T2<Integer,String>>	filterColumns(GridQueryTypeDescriptor typeDescriptor, @Nullable Collection<String> colNames) Filter columns by specified names.
List<StatisticsAddressedRequest>	generateGatheringRequests(StatisticsTarget target, StatisticsObjectConfiguration cfg) Generate local statistics requests.
CacheGroupContext	groupContext(StatisticsKey key) Get cache group context by specified statistics key.

Methods inherited from class java.lang.Object

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

Constructor Detail

IgniteStatisticsHelper

public IgniteStatisticsHelper(UUID locNodeId,
                              SchemaManager schemaMgr,
                              Function<Class<?>,IgniteLogger> logSupplier)

Constructor.

Parameters:

locNodeId - Local node id.

schemaMgr - Schema manager.

logSupplier - Ignite logger supplier to get logger from.

Method Detail

groupContext

public CacheGroupContext groupContext(StatisticsKey key)
                               throws IgniteCheckedException

Get cache group context by specified statistics key.

Parameters:

key - Statistics key to get context by.

Returns:

Cache group context for the given key.

Throws:

IgniteCheckedException - If unable to find table by specified key.

generateGatheringRequests

public List<StatisticsAddressedRequest> generateGatheringRequests(StatisticsTarget target,
                                                                  StatisticsObjectConfiguration cfg)
                                                           throws IgniteCheckedException

Generate local statistics requests.

Parameters:

target - Statistics target to request local statistics by.

cfg - Statistics configuration.

Returns:

Collection of statistics request.

Throws:

IgniteCheckedException

aggregateLocalStatistics

public ObjectStatisticsImpl aggregateLocalStatistics(StatisticsObjectConfiguration cfg,
                                                     Collection<? extends ObjectStatisticsImpl> stats)

Aggregate specified partition level statistics to local level statistics.

Parameters:

cfg - Statistics object configuration.

stats - Collection of all local partition level or local level statistics by specified key to aggregate.

Returns:

Local level aggregated statistics.

aggregateLocalStatistics

public static ObjectStatisticsImpl aggregateLocalStatistics(GridQueryTypeDescriptor tbl,
                                                            StatisticsObjectConfiguration cfg,
                                                            Collection<? extends ObjectStatisticsImpl> stats,
                                                            IgniteLogger log)

Aggregate partition level statistics to local level one or local statistics to global one.

Parameters:

tbl - Table to aggregate statistics by.

cfg - Statistics object configuration.

stats - Collection of partition level or local level statistics to aggregate.

log - Logger.

Returns:

Local level statistics.

calculateRowCount

public static long calculateRowCount(StatisticsObjectConfiguration cfg,
                                     long actualRowCount)

Calculate effective row count. If there are some overrides in statistics configuration - maximum value will be choosen. If not - will return actualRowCount.

Parameters:

cfg - Statistics configuration to dig overrides row count from.

actualRowCount - Actual row count.

Returns:

Effective row count.

buildDefaultConfigurations

public static StatisticsObjectConfiguration[] buildDefaultConfigurations(StatisticsTarget... targets)

Build object configurations array with all default parameters from specified targets.

Parameters:

targets - Targets to build configurations from.

Returns:

StatisticsObjectConfiguration array.

filterColumns

public static List<T2<Integer,String>> filterColumns(GridQueryTypeDescriptor typeDescriptor,
                                                     @Nullable
                                                     @Nullable Collection<String> colNames)

Filter columns by specified names.

Parameters:

typeDescriptor - Table descriptor.

colNames - Column names.

Returns:

Column with specified names.