io.delta.kernel.internal

Class DeltaHistoryManager

Object

io.delta.kernel.internal.DeltaHistoryManager

public final class DeltaHistoryManager
extends Object

Method Summary

Modifier and Type	Method and Description
static long	getActiveCommitAtTimestamp(Engine engine, Path logPath, long timestamp) Returns the latest recreatable commit that happened at or before timestamp.
static long	getEarliestRecreatableCommit(Engine engine, Path logPath) Gets the earliest commit that we can recreate.

Methods inherited from class Object

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

Method Detail

getActiveCommitAtTimestamp

public static long getActiveCommitAtTimestamp(Engine engine,
                                              Path logPath,
                                              long timestamp)
                                       throws TableNotFoundException

Returns the latest recreatable commit that happened at or before timestamp. If the provided timestamp is after the timestamp of the latest version of the table throws an exception. If the provided timestamp is before the timestamp of the earliest version of the table throws an exception.

Parameters:

engine - instance of Engine to use

logPath - the _delta_log path of the table

timestamp - the timestamp find the version for in milliseconds since the unix epoch

Returns:

the active recreatable commit version at the provided timestamp

Throws:

TableNotFoundException - when there is no Delta table at the given path

getEarliestRecreatableCommit

public static long getEarliestRecreatableCommit(Engine engine,
                                                Path logPath)
                                         throws TableNotFoundException

Gets the earliest commit that we can recreate. Note that this version isn't guaranteed to exist when performing an action as a concurrent operation can delete the file during cleanup. This value must be used as a lower bound. We search for the earliest checkpoint we have, or whether we have the 0th delta file. This method assumes that the commits are contiguous.

Throws:

TableNotFoundException