Package com.bigdata.mdi

This package provides a metadata index and range partitioned indices managed by that metadata index.

See: Description

Interface Summary

Interface	Description
IMetadataIndex	Interface for a metadata index.
IPartitionMetadata	A description of the metadata state for a partition of a scale-out index.
IResourceMetadata	Interface for metadata about a Journal or IndexSegment.
ISeparatorKeys	Interface provides access to the left and right separator keys for an index partition.

Class Summary

Class	Description
AbstractResourceMetadata	Base class for IResourceMetadata implementations.
IndexPartitionCause	Encapsulate the reason why an index partition was created and the synchronous overflow counter of the data service on which the index partition was created as of that action.
JournalMetadata	Metadata required to locate a Journal resource.
LocalPartitionMetadata	An immutable object providing metadata about a local index partition, including the partition identifier, the left and right separator keys defining the half-open key range of the index partition, and optionally defining the IResourceMetadata[] required to materialize a view of that index partition.
MetadataIndex	A metadata index for the partitions of a distributed index.
MetadataIndex.MetadataIndexCheckpoint	Extends the Checkpoint record to store the next partition identifier to be assigned by the metadata index.
MetadataIndex.MetadataIndexMetadata	Extends the IndexMetadata record to hold the metadata template for the managed scale-out index.
MetadataIndex.PartitionLocatorTupleSerializer	Used to (de-)serialize PartitionLocators in the MetadataIndex.
MetadataIndexView	The extension semantics for the IMetadataIndex are implemented by this class.
PartitionLocator	An immutable object that may be used to locate an index partition.
SegmentMetadata	Metadata for a single IndexSegment.
TestAll	Aggregates test suites into increasing dependency order.

Enum Summary

Enum	Description
IndexPartitionCause.CauseEnum	Typesafe enumeration of reasons why an index partition was created.

Package com.bigdata.mdi Description

This package provides a metadata index and range partitioned indices managed by that metadata index. Each index partition is a fused view of one or more resources. Those resources include a mutable BTree hosted on a Journal and read-only index segments. Reads are against the fused view. Writes are against the mutable BTree.

Periodically the mutable BTree, or the journal on which it resides, will fill up and a merge task will generate a read-only index segment. When a full merge (aka compacting merge) is applied, the result is a single index segment containing all data for the index partition. Depending on the history policy, some historical data versions and delete markers may be purged from the view meaning that some historical commit states will no longer be readable.

Index partitions are created by a split operation and merged by a join operation. These operations create new index partitions having different separator keys. Split and join operations are not effective until the metadata index has been updated.