org.janusgraph.diskstorage.log.kcvs

Class KCVSLogManager

java.lang.Object

org.janusgraph.diskstorage.log.kcvs.KCVSLogManager

All Implemented Interfaces:

LogManager

public class KCVSLogManager
extends Object
implements LogManager

Implementation of LogManager against an arbitrary KeyColumnValueStoreManager. Issues Log instances which wrap around a KeyColumnValueStore.

Author:

Matthias Broecheler ([email protected])

Field Summary

Fields

Modifier and Type	Field and Description
static int	CLUSTER_SIZE_DIVIDER If LOG_MAX_PARTITIONS isn't set explicitly, the number of partitions is derived by taking the configured GraphDatabaseConfiguration.CLUSTER_MAX_PARTITIONS and dividing the number by this constant.
static ConfigOption<Boolean>	LOG_FIXED_PARTITION
static ConfigOption<Integer>	LOG_MAX_PARTITIONS

Constructor Summary

Constructors

Constructor and Description
KCVSLogManager(KeyColumnValueStoreManager storeManager, Configuration config) Opens a log manager against the provided KCVS store with the given configuration.
KCVSLogManager(KeyColumnValueStoreManager storeManager, Configuration config, int[] readPartitionIds) Opens a log manager against the provided KCVS store with the given configuration.

Method Summary

Modifier and Type	Method and Description
void	close() Closes the log manager and all open logs (if they haven't already been explicitly closed)
KCVSLog	openLog(String name) Opens a log for the given name.

Methods inherited from class java.lang.Object

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

Field Detail

LOG_FIXED_PARTITION

public static final ConfigOption<Boolean> LOG_FIXED_PARTITION

LOG_MAX_PARTITIONS

public static final ConfigOption<Integer> LOG_MAX_PARTITIONS

CLUSTER_SIZE_DIVIDER

public static final int CLUSTER_SIZE_DIVIDER

If LOG_MAX_PARTITIONS isn't set explicitly, the number of partitions is derived by taking the configured GraphDatabaseConfiguration.CLUSTER_MAX_PARTITIONS and dividing the number by this constant.

See Also:

Constant Field Values

Constructor Detail

KCVSLogManager

public KCVSLogManager(KeyColumnValueStoreManager storeManager,
                      Configuration config)

Opens a log manager against the provided KCVS store with the given configuration.

Parameters:

storeManager -

config -

KCVSLogManager

public KCVSLogManager(KeyColumnValueStoreManager storeManager,
                      Configuration config,
                      int[] readPartitionIds)

Opens a log manager against the provided KCVS store with the given configuration. Also provided is a list of read-partition-ids. These only apply when readers are registered against an opened log. In that case, the readers only read from the provided list of partition ids.

Parameters:

storeManager -

config -

readPartitionIds -

Method Detail

openLog

public KCVSLog openLog(String name)
                throws BackendException

Description copied from interface: LogManager

Opens a log for the given name.

If a log with the given name already exists, the existing log is returned.

Specified by:

openLog in interface LogManager

Parameters:

name - Name of the log to be opened

Returns:

Throws:

BackendException

close

public void close()
           throws BackendException

Description copied from interface: LogManager

Closes the log manager and all open logs (if they haven't already been explicitly closed)

Specified by:

close in interface LogManager

Throws:

BackendException