Package org.apache.accumulo.server.conf

Class ZooBasedConfiguration

java.lang.Object

org.apache.accumulo.core.conf.AccumuloConfiguration

org.apache.accumulo.server.conf.ZooBasedConfiguration

All Implemented Interfaces:

Iterable<Map.Entry<String,String>>

Direct Known Subclasses:

NamespaceConfiguration, SystemConfiguration, TableConfiguration

public class ZooBasedConfiguration
extends AccumuloConfiguration

Instances maintain a local cache of the AccumuloConfiguration hierarchy that will be consistent with stored properties.

When calling getProperties - the local copy will be updated if ZooKeeper changes have been received.

The getUpdateCount() provides an optimization for clients - the count can be used to detect changes without reading the properties. When the update count changes, the next getProperties call will update the local copy and the change count.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.accumulo.core.conf.AccumuloConfiguration

AccumuloConfiguration.Deriver<T extends Object>, AccumuloConfiguration.ScanExecutorConfig

Field Summary

Fields

Modifier and Type	Field	Description
protected org.slf4j.Logger	log

Constructor Summary

Constructors

Constructor	Description
ZooBasedConfiguration(org.slf4j.Logger log, ServerContext context, PropStoreKey<?> propStoreKey, AccumuloConfiguration parent)

Method Summary

Modifier and Type	Method	Description
@Nullable String	get(Property property)
long	getDataVersion()
AccumuloConfiguration	getParent()
void	getProperties(Map<String,String> props, Predicate<String> filter)
PropStoreKey<?>	getPropStoreKey()
@NonNull Map<String,String>	getSnapshot()
long	getUpdateCount()	The update count is the sum of the change count of this configuration and the change counts of the parents.
void	invalidateCache()
boolean	isPropertySet(Property property)
void	zkChangeEvent(PropStoreKey<?> propStoreKey)

Methods inherited from class org.apache.accumulo.core.conf.AccumuloConfiguration

get, getAllCryptoProperties, getAllPropertiesWithPrefix, getAllPropertiesWithPrefixStripped, getAsBytes, getBoolean, getCount, getFraction, getMaxFilesPerTablet, getPath, getPort, getPortStream, getScanExecutors, getTimeInMillis, iterator, newDeriver, resolve, stream

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

log

protected final org.slf4j.Logger log

Constructor Detail

ZooBasedConfiguration

public ZooBasedConfiguration(org.slf4j.Logger log,
                             ServerContext context,
                             PropStoreKey<?> propStoreKey,
                             AccumuloConfiguration parent)

Method Detail

zkChangeEvent

public void zkChangeEvent(PropStoreKey<?> propStoreKey)

getDataVersion

public long getDataVersion()

getUpdateCount

public long getUpdateCount()

The update count is the sum of the change count of this configuration and the change counts of the parents. The count is used to detect if any changes occurred in the configuration hierarchy and if the configuration needs to be recalculated to maintain consistency with values in the backend store.

The count is required to be an increasing value.

Overrides:

getUpdateCount in class AccumuloConfiguration

getParent

public AccumuloConfiguration getParent()

Overrides:

getParent in class AccumuloConfiguration

getPropStoreKey

public PropStoreKey<?> getPropStoreKey()

get

public @Nullable String get(Property property)

Specified by:

get in class AccumuloConfiguration

getProperties

public void getProperties(Map<String,String> props,
                          Predicate<String> filter)

Specified by:

getProperties in class AccumuloConfiguration

isPropertySet

public boolean isPropertySet(Property property)

Specified by:

isPropertySet in class AccumuloConfiguration

getSnapshot

public @NonNull Map<String,String> getSnapshot()

invalidateCache

public void invalidateCache()

Overrides:

invalidateCache in class AccumuloConfiguration