Package org.apache.tephra.persist

This package contains interfaces and implementations for persisting transaction state.

See: Description

Interface Summary

Interface	Description
TransactionLog	Represents a log of transaction state changes.
TransactionLogReader	Represents a reader for TransactionLog instances.
TransactionLogWriter	Common interface for transaction log writers used by classes extending AbstractTransactionLog.
TransactionStateStorage	Defines the common contract for persisting transaction state changes.
TransactionVisibilityState	Transaction Visibility state contains information required by TransactionProcessor CoProcessor to determine cell visibility.

Class Summary

Class	Description
AbstractTransactionLog	Common implementation of a transaction log, backed by file reader and writer based storage.
AbstractTransactionLog.Entry	Represents an entry in the transaction log.
AbstractTransactionStateStorage	Common base class for all transaction storage implementations.
CommitMarkerCodec	Class to read and write commit markers used in HDFSTransactionLogReaderV2 and above.
HDFSTransactionLog	Allows reading from and writing to a transaction write-ahead log stored in HDFS.
HDFSTransactionLogReaderSupplier	Provides the correct version of TransactionLogReader, based on the log's version metadata, to read HDFS Transaction Logs.
HDFSTransactionLogReaderV1	TransactionLogReader that can read v1 (default) version of Transaction logs.
HDFSTransactionLogReaderV2	TransactionLogReader that can read v2 version of Transaction logs.
HDFSTransactionLogReaderV3	TransactionLogReader that can read v3 version of Transaction logs.
HDFSTransactionStateStorage	Handles persistence of transaction snapshot and logs to a directory in HDFS.
HDFSUtil	Utility for handling HDFS file lease recovery.
LocalFileTransactionLog	Reads and writes transaction logs against files in the local filesystem.
LocalFileTransactionStateStorage	Persists transaction snapshots and write-ahead logs to files on the local filesystem.
NoOpTransactionStateStorage	Minimal TransactionStateStorage implementation that does nothing, i.e.
TransactionEdit	Represents a transaction state change in the TransactionLog.
TransactionEditCodecs	Utilities to handle encoding and decoding of TransactionEdit entries, while maintaining compatibility with older versions of the serialized data.
TransactionSnapshot	Represents an in-memory snapshot of the full transaction state.

Enum Summary

Enum	Description
TransactionEdit.State	The possible state changes for a transaction.

Package org.apache.tephra.persist Description

This package contains interfaces and implementations for persisting transaction state.