Package org.apache.accumulo.server.master.state

Class TabletStateStore

java.lang.Object

org.apache.accumulo.server.master.state.TabletStateStore

All Implemented Interfaces:

Iterable<TabletLocationState>

Direct Known Subclasses:

MetaDataStateStore, ZooTabletStateStore

public abstract class TabletStateStore
extends Object
implements Iterable<TabletLocationState>

Interface for storing information about tablet assignments. There are three implementations: ZooTabletStateStore: information about the root tablet is stored in ZooKeeper MetaDataStateStore: information about the other tablets are stored in the metadata table

Constructor Summary

Constructors

Constructor	Description
TabletStateStore()

Method Summary

Modifier and Type	Method	Description
protected static TabletStateStore	getStoreForTablet(KeyExtent extent, ServerContext context)
abstract ClosableIterator<TabletLocationState>	iterator()	Scan the information about the tablets covered by this store
abstract String	name()	Identifying name for this tablet state store.
abstract void	setFutureLocations(Collection<Assignment> assignments)	Store the assigned locations in the data store.
static void	setLocation(ServerContext context, Assignment assignment)
abstract void	setLocations(Collection<Assignment> assignments)	Tablet servers will update the data store with the location when they bring the tablet online
abstract void	suspend(Collection<TabletLocationState> tablets, Map<TServerInstance,List<org.apache.hadoop.fs.Path>> logsForDeadServers, long suspensionTimestamp)	Mark tablets as having no known or future location, but desiring to be returned to their previous tserver.
static void	suspend(ServerContext context, TabletLocationState tls, Map<TServerInstance,List<org.apache.hadoop.fs.Path>> logsForDeadServers, long suspensionTimestamp)
abstract void	unassign(Collection<TabletLocationState> tablets, Map<TServerInstance,List<org.apache.hadoop.fs.Path>> logsForDeadServers)	Mark the tablets as having no known or future location.
static void	unassign(ServerContext context, TabletLocationState tls, Map<TServerInstance,List<org.apache.hadoop.fs.Path>> logsForDeadServers)
abstract void	unsuspend(Collection<TabletLocationState> tablets)	Remove a suspension marker for a collection of tablets, moving them to being simply unassigned.

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

Constructor Detail

TabletStateStore

public TabletStateStore()

Method Detail

name

public abstract String name()

Identifying name for this tablet state store.

iterator

public abstract ClosableIterator<TabletLocationState> iterator()

Scan the information about the tablets covered by this store

Specified by:

iterator in interface Iterable<TabletLocationState>

setFutureLocations

public abstract void setFutureLocations(Collection<Assignment> assignments)
                                 throws DistributedStoreException

Store the assigned locations in the data store.

Throws:

DistributedStoreException

setLocations

public abstract void setLocations(Collection<Assignment> assignments)
                           throws DistributedStoreException

Tablet servers will update the data store with the location when they bring the tablet online

Throws:

DistributedStoreException

unassign

public abstract void unassign(Collection<TabletLocationState> tablets,
                              Map<TServerInstance,List<org.apache.hadoop.fs.Path>> logsForDeadServers)
                       throws DistributedStoreException

Mark the tablets as having no known or future location.

Parameters:

tablets - the tablets' current information

logsForDeadServers - a cache of logs in use by servers when they died

Throws:

DistributedStoreException

suspend

public abstract void suspend(Collection<TabletLocationState> tablets,
                             Map<TServerInstance,List<org.apache.hadoop.fs.Path>> logsForDeadServers,
                             long suspensionTimestamp)
                      throws DistributedStoreException

Mark tablets as having no known or future location, but desiring to be returned to their previous tserver.

Throws:

DistributedStoreException

unsuspend

public abstract void unsuspend(Collection<TabletLocationState> tablets)
                        throws DistributedStoreException

Remove a suspension marker for a collection of tablets, moving them to being simply unassigned.

Throws:

DistributedStoreException

unassign

public static void unassign(ServerContext context,
                            TabletLocationState tls,
                            Map<TServerInstance,List<org.apache.hadoop.fs.Path>> logsForDeadServers)
                     throws DistributedStoreException

Throws:

DistributedStoreException

suspend

public static void suspend(ServerContext context,
                           TabletLocationState tls,
                           Map<TServerInstance,List<org.apache.hadoop.fs.Path>> logsForDeadServers,
                           long suspensionTimestamp)
                    throws DistributedStoreException

Throws:

DistributedStoreException

setLocation

public static void setLocation(ServerContext context,
                               Assignment assignment)
                        throws DistributedStoreException

Throws:

DistributedStoreException

getStoreForTablet

protected static TabletStateStore getStoreForTablet(KeyExtent extent,
                                                    ServerContext context)