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

Interface Summary
CancellableTask: Runnable task with cancel method.
IgniteStatisticsManager: Statistics manager.
IgniteStatisticsStore: Statistics store interface.
ObjectStatistics: Any type of object statistics.

Class Summary
BusyExecutor: Executor with busy run support.
ColumnStatistics: Values statistic in particular column.
ColumnStatisticsCollector: Collector to compute statistic by single column.
Hasher: Implement Murmur8_128 hash function for byte arrays.
IgniteGlobalStatisticsManager: Global statistics manager.
IgniteStatisticsConfigurationManager: Holds statistic configuration objects at the distributed metastore and match local statistics with target statistic configuration.
IgniteStatisticsDummyStoreImpl: Statistics store implementation to log unexpected calls.
IgniteStatisticsHelper: Utility methods to statistics messages generation.
IgniteStatisticsInMemoryStoreImpl: Sql statistics storage in metastore.
IgniteStatisticsManagerImpl: Statistics manager implementation.
IgniteStatisticsPersistenceStoreImpl: Sql statistics storage in metastore.
IgniteStatisticsRepository: Statistics repository implementation.
IgniteStatisticsRepository.VersionedStatistics: Object statistics with topology version to which it is actual for.
LocalStatisticsGatheringContext: Statistics gathering context.
ObjectPartitionStatisticsImpl: Statistic for some partition of data object.
ObjectPartitionStatisticsObsolescence: Partition obsolescence tracker.
ObjectStatisticsEvent: Local object statistics change event.
ObjectStatisticsImpl: All statistics by some object (table or index).
StatisticsAddressedRequest: Statistics request with target/sender node id.
StatisticsKey: Key to collect statistics by.
StatisticsProcessor: Process all tasks, related to statistics repository.
StatisticsTarget: Target to collect statistics by.
StatisticsUtils: Utilities to convert statistics from/to messages, validate configurations with statistics and so on.

Enum Summary
StatisticsType: Types of statistics width.
StatisticsUsageState: Statistics usage state.

Exception Summary
GatherStatisticCancelException