org.apache.ignite.client

Interface ClientCluster

All Superinterfaces:

ClientClusterGroup

public interface ClientCluster
extends ClientClusterGroup

Thin client cluster facade. Represents whole cluster (all available nodes).

Method Summary

Modifier and Type	Method and Description
boolean	disableWal(String cacheName) Disables write-ahead logging for specified cache.
boolean	enableWal(String cacheName) Enables write-ahead logging for specified cache.
boolean	isWalEnabled(String cacheName) Checks if write-ahead logging is enabled for specified cache.
ClusterState	state() Gets current cluster state.
void	state(ClusterState newState) Changes current cluster state to given newState cluster state.

Methods inherited from interface org.apache.ignite.client.ClientClusterGroup

forAttribute, forClients, forHost, forHost, forNode, forNodeId, forNodeIds, forNodes, forOldest, forOthers, forOthers, forPredicate, forRandom, forServers, forYoungest, node, node, nodes

Method Detail

state

ClusterState state()

Gets current cluster state.

Returns:

Current cluster state.

state

void state(ClusterState newState)
    throws ClientException

Changes current cluster state to given newState cluster state.

NOTE: Deactivation clears in-memory caches (without persistence) including the system caches.

Parameters:

newState - New cluster state.

Throws:

ClientException - If change state operation failed.

disableWal

boolean disableWal(String cacheName)
            throws ClientException

Disables write-ahead logging for specified cache. When WAL is disabled, changes are not logged to disk. This significantly improves cache update speed. The drawback is absence of local crash-recovery guarantees. If node is crashed, local content of WAL-disabled cache will be cleared on restart to avoid data corruption.

Internally this method will wait for all current cache operations to finish and prevent new cache operations from being executed. Then checkpoint is initiated to flush all data to disk. Control is returned to the callee when all dirty pages are prepared for checkpoint, but not necessarily flushed to disk.

WAL state can be changed only for persistent caches.

Parameters:

cacheName - Cache name.

Returns:

Whether WAL disabled by this call.

Throws:

ClientException - If error occurs.

See Also:

enableWal(String), isWalEnabled(String)

enableWal

boolean enableWal(String cacheName)
           throws ClientException

Enables write-ahead logging for specified cache. Restoring crash-recovery guarantees of a previous call to disableWal(String).

Internally this method will wait for all current cache operations to finish and prevent new cache operations from being executed. Then checkpoint is initiated to flush all data to disk. Control is returned to the callee when all data is persisted to disk.

WAL state can be changed only for persistent caches.

Parameters:

cacheName - Cache name.

Returns:

Whether WAL enabled by this call.

Throws:

ClientException - If error occurs.

See Also:

disableWal(String), isWalEnabled(String)

isWalEnabled

boolean isWalEnabled(String cacheName)

Checks if write-ahead logging is enabled for specified cache.

Parameters:

cacheName - Cache name.

Returns:

True if WAL is enabled for cache.

See Also:

disableWal(String), enableWal(String)