Package com.illumon.iris.db.tables.appendable.local

Class LocalAppendableTableTools

java.lang.Object

com.illumon.iris.db.tables.appendable.local.LocalAppendableTableTools

public class LocalAppendableTableTools
extends Object

Helper class for tools related to local appendable tables.

Constructor Summary

Constructors

Constructor	Description
LocalAppendableTableTools()

Method Summary

Modifier and Type	Method	Description
static void	generateMissingCheckpointRecord(TableDefinition tableDefinition, WritableLocalTableLocation tableLocation)	Attempt to generate a table location checkpoint record for the supplied definition and location.
static boolean	upgradeCheckpointRecord(TableDefinition tableDefinition, WritableLocalTableLocation tableLocation)	Attempt to upgrade a table location checkpoint record for the supplied definition and location by filling in empty fields.

Methods inherited from class java.lang.Object

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

Constructor Details

LocalAppendableTableTools

public LocalAppendableTableTools()

Method Details

generateMissingCheckpointRecord

public static void generateMissingCheckpointRecord(@NotNull TableDefinition tableDefinition, @NotNull WritableLocalTableLocation tableLocation)

Attempt to generate a table location checkpoint record for the supplied definition and location.

Assumes that the location's writer checkpoint record has been found to be missing or cleared, and that existing data is fully consistent.

This is mostly useful for legacy table location formats used prior to the advent of support for dynamically-updating data. It's not expected that any table location written since 2012 will be missing metadata altogether.

Parameters:

tableDefinition - The table definition expected for the location's columns

tableLocation - The table location

upgradeCheckpointRecord

public static boolean upgradeCheckpointRecord(@NotNull TableDefinition tableDefinition, @NotNull WritableLocalTableLocation tableLocation)

Attempt to upgrade a table location checkpoint record for the supplied definition and location by filling in empty fields.

Assumes that the location's writer checkpoint record has been filled from persistent storage, and that existing data is fully consistent.

This is mostly useful for appending to table locations written with prior checkpoint record versions.

Parameters:

tableDefinition - The table definition expected for the location's columns

tableLocation - The table location

Returns:

true if the checkpoint record was changed