# Package org.apache.cassandra.db

- Interface Summary
  Interface | Description
  --- | ---
  BlacklistedDirectoriesMBean |
  Clusterable | Common class for objects that are identified by a clustering prefix, and can be thus sorted by a `ClusteringComparator`.
  Clustering |
  ClusteringPrefix | A clustering prefix is the unit of what a `ClusteringComparator` can compare.
  ColumnFamilyStoreMBean | The MBean interface for ColumnFamilyStore
  DeletionInfo | A combination of a top-level (partition) tombstone and range tombstones describing the deletions within a partition.
  DeletionPurger |
  HintedHandOffManagerMBean | Deprecated
  IMutation |
  LegacyLayout.LegacyAtom |
  Mutation.SimpleBuilder | Interface for building mutations geared towards human.
  PartitionPosition |
  ReadQuery | Generic abstraction for read queries.
  RowIndexEntry.IndexInfoRetriever | Base class to access `IndexInfo` objects.
  RowIndexEntry.IndexSerializer<T> |
  Slices.InOrderTester | In simple object that allows to test the inclusion of rows in those slices assuming those rows are passed (to `Slices.InOrderTester.includes(org.apache.cassandra.db.Clustering)`) in clustering order (or reverse clustering ordered, depending of the argument passed to `Slices.inOrderTester(boolean)`).
  StorageHook |

- Class Summary
  Class | Description
  --- | ---
  AbstractBufferClusteringPrefix |
  AbstractClusteringPrefix |
  AbstractReadCommandBuilder |
  AbstractReadCommandBuilder.PartitionRangeBuilder |
  AbstractReadCommandBuilder.SinglePartitionBuilder |
  AbstractReadCommandBuilder.SinglePartitionSliceBuilder |
  BlacklistedDirectories |
  BufferClustering | The clustering column values for a row.
  BufferDecoratedKey |
  CachedHashDecoratedKey |
  CBuilder | Allows to build ClusteringPrefixes, either Clustering or ClusteringBound.
  ClockAndCount |
  Clustering.Serializer | Serializer for Clustering object.
  ClusteringBound | The start or end of a range of clusterings, either inclusive or exclusive.
  ClusteringBoundary | The threshold between two different ranges, i.e.
  ClusteringBoundOrBoundary | This class defines a threshold between ranges of clusterings.
  ClusteringBoundOrBoundary.Serializer |
  ClusteringComparator | A comparator of clustering prefixes (or more generally of `Clusterable`}.
  ClusteringPrefix.Deserializer | Helper class that makes the deserialization of clustering prefixes faster.
  ClusteringPrefix.Serializer |
  ColumnFamilyStore |
  ColumnFamilyStore.FlushLargestColumnFamily | Finds the largest memtable, as a percentage of *either* on- or off-heap memory limits, and immediately queues it for flushing.
  ColumnFamilyStore.RefViewFragment |
  ColumnFamilyStore.ViewFragment |
  ColumnFamilyStoreCQLHelper | Helper methods to represent CFMetadata and related objects in CQL format
  ColumnIndex | Column index builder used by `BigTableWriter`.
  Columns | An immutable and sorted list of (non-PK) columns for a given table.
  Columns.Serializer |
  CompactTables | Small utility methods pertaining to the encoding of COMPACT STORAGE tables.
  CompactTables.DefaultNames |
  Conflicts |
  CounterMutation |
  CounterMutation.CounterMutationSerializer |
  CounterMutationVerbHandler |
  DataRange | Groups both the range of partitions to query, and the clustering index filter to apply for each partition (for a (partition) range query).
  DataRange.Paging | Specialized `DataRange` used for the paging case.
  DataRange.Serializer |
  DecoratedKey | Represents a decorated key, handy for certain operations where just working with strings gets slow.
  DefinitionsUpdateVerbHandler | Called when node receives updated schema state from the schema migration coordinator node.
  DeletionTime | Information on deletion of a storage engine object.
  DeletionTime.Serializer |
  Directories | Encapsulate handling of paths to the data files.
  Directories.DataDirectory |
  DiskBoundaries |
  DiskBoundaryManager |
  EmptyIterators |
  ExpirationDateOverflowHandling |
  HintedHandOffManager | Deprecated
  Keyspace | It represents a Keyspace.
  LegacyLayout | Functions to deal with the old format.
  LegacyLayout.CellGrouper |
  LegacyLayout.LegacyBound |
  LegacyLayout.LegacyCell | A legacy cell.
  LegacyLayout.LegacyCellName |
  LegacyLayout.LegacyDeletionInfo |
  LegacyLayout.LegacyRangeTombstone | A legacy range tombstone.
  LegacyLayout.LegacyRangeTombstoneList | Almost an entire copy of RangeTombstoneList from C* 2.1.
  LegacyLayout.LegacyUnfilteredPartition |
  LivenessInfo | Stores the information relating to the liveness of the primary key columns of a row.
  Memtable |
  Memtable.LastCommitLogPosition |
  Memtable.MemtableUnfilteredPartitionIterator |
  MigrationRequestVerbHandler | Sends it's current schema state in form of mutations in reply to the remote node's request.
  MultiCBuilder | Builder that allow to build multiple Clustering/ClusteringBound at the same time.
  MutableDeletionInfo | A mutable implementation of `DeletionInfo`.
  MutableDeletionInfo.Builder | Builds DeletionInfo object from (in order) range tombstone markers.
  Mutation |
  Mutation.MutationSerializer |
  MutationVerbHandler |
  NativeClustering |
  NativeDecoratedKey |
  PartitionColumns | Columns (or a subset of the columns) that a partition contains.
  PartitionColumns.Builder |
  PartitionPosition.ForKey |
  PartitionPosition.RowPositionSerializer |
  PartitionRangeReadCommand | A read command that selects a (part of a) range of partitions.
  PreHashedDecoratedKey |
  RangeSliceVerbHandler |
  RangeTombstone | A range tombstone is a tombstone that covers a slice/range of rows.
  RangeTombstoneList | Data structure holding the range tombstones of a ColumnFamily.
  ReadCommand | General interface for storage-engine read commands (common to both range and single partition commands).
  ReadCommand.SelectionDeserializer |
  ReadCommandVerbHandler |
  ReadExecutionController |
  ReadRepairVerbHandler |
  ReadResponse |
  RowIndexEntry<T> | Binary format of `RowIndexEntry` is defined as follows: {@code (long) position (64 bit long, vint encoded) (int) serialized size of data that follows (32 bit int, vint encoded) -- following for indexed entries only (so serialized size > 0) (int) DeletionTime.localDeletionTime (long) DeletionTime.markedForDeletionAt (int) number of IndexInfo objects (32 bit int, vint encoded) (*) serialized IndexInfo objects, see below (*) offsets of serialized IndexInfo objects, since version "ma" (3.0) Each IndexInfo object's offset is relative to the first IndexInfo object.
  RowIndexEntry.Serializer |
  SchemaCheckVerbHandler |
  SerializationHeader |
  SerializationHeader.Component | We need the CFMetadata to properly deserialize a SerializationHeader but it's clunky to pass that to a SSTable component, so we use this temporary object to delay the actual need for the metadata.
  SerializationHeader.Serializer |
  Serializers | Holds references on serializers that depend on the table definition.
  SimpleBuilders |
  SimpleBuilders.MutationBuilder |
  SimpleBuilders.PartitionUpdateBuilder |
  SimpleBuilders.RowBuilder |
  SinglePartitionReadCommand | A read command that selects a (part of a) single partition.
  SinglePartitionReadCommand.Group | Groups multiple single partition read commands.
  SizeEstimatesRecorder | A very simplistic/crude partition count/size estimator.
  Slice | A slice represents the selection of a range of rows.
  Slice.Serializer |
  Slices | Represents the selection of multiple range of rows within a partition.
  Slices.Builder | Builder to create `Slices` objects.
  Slices.Serializer |
  SnapshotCommand |
  SnapshotDetailsTabularData |
  SystemKeyspace |
  TruncateResponse | This message is sent back the truncate operation and basically specifies if the truncate succeeded.
  TruncateResponse.TruncateResponseSerializer |
  TruncateVerbHandler |
  Truncation | A truncate operation descriptor
  TypeSizes |
  UnfilteredDeserializer | Helper class to deserialize Unfiltered object from disk efficiently.
  UnfilteredDeserializer.OldFormatDeserializer |
  WindowsFailedSnapshotTracker |
  WriteResponse |
  WriteResponse.Serializer |

- Enum Summary
  Enum | Description
  --- | ---
  ClusteringPrefix.Kind | The kind of clustering prefix this actually is.
  Conflicts.Resolution |
  ConsistencyLevel |
  Directories.FileAction |
  Directories.FileType | The type of files that can be listed by SSTableLister, we never return txn logs, use LifecycleTransaction.getFiles() if you need txn logs.
  Directories.OnTxnErr | How to handle a failure to read a txn log file.
  ExpirationDateOverflowHandling.ExpirationDateOverflowPolicy |
  LegacyLayout.LegacyCell.Kind |
  PartitionPosition.Kind |
  ReadCommand.Kind |
  SystemKeyspace.BootstrapState |
  WriteType |

- Exception Summary
  Exception | Description
  --- | ---
  KeyspaceNotDefinedException |
  UnknownColumnException | Exception thrown when we read a column internally that is unknown.
  UnknownColumnFamilyException |

Copyright © 2018 The Apache Software Foundation