org.apache.cassandra.service
Class StorageProxy

java.lang.Object
  org.apache.cassandra.service.StorageProxy

All Implemented Interfaces:

StorageProxyMBean

public class StorageProxy
extends java.lang.Object
implements StorageProxyMBean

Method Summary

static java.util.Map<java.lang.String,java.util.List<java.lang.String>>	describeSchemaVersions() initiate a request/response session with each live node to check whether or not everybody is using the same migration id.
boolean	getHintedHandoffEnabled()
long	getRangeOperations()
static java.util.List<Row>	getRangeSlice(RangeSliceCommand command, ConsistencyLevel consistency_level)
long	getReadOperations()
double	getRecentRangeLatencyMicros()
double	getRecentReadLatencyMicros()
double	getRecentWriteLatencyMicros()
long	getTotalRangeLatencyMicros()
long	getTotalReadLatencyMicros()
long	getTotalWriteLatencyMicros()
long	getWriteOperations()
static boolean	isHintedHandoffEnabled()
static void	mutate(java.util.List<RowMutation> mutations, ConsistencyLevel consistency_level) Use this method to have these RowMutations applied across all replicas.
static java.util.List<Row>	readProtocol(java.util.List<ReadCommand> commands, ConsistencyLevel consistency_level) Performs the actual reading of a row out of the StorageService, fetching a specific set of column names from a given column family.
static java.util.List<Row>	scan(java.lang.String keyspace, java.lang.String column_family, IndexClause index_clause, SlicePredicate column_predicate, ConsistencyLevel consistency_level)
void	setHintedHandoffEnabled(boolean b)
static void	truncateBlocking(java.lang.String keyspace, java.lang.String cfname) Performs the truncate operatoin, which effectively deletes all data from the column family cfname

Methods inherited from class java.lang.Object

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

Method Detail

mutate

public static void mutate(java.util.List<RowMutation> mutations,
                          ConsistencyLevel consistency_level)
                   throws UnavailableException,
                          java.util.concurrent.TimeoutException

Use this method to have these RowMutations applied across all replicas. This method will take care of the possibility of a replica being down and hint the data across to some other replica.

Parameters:

mutations - the mutations to be applied across the replicas

consistency_level - the consistency level for the operation

Throws:

UnavailableException

java.util.concurrent.TimeoutException

readProtocol

public static java.util.List<Row> readProtocol(java.util.List<ReadCommand> commands,
                                               ConsistencyLevel consistency_level)
                                        throws java.io.IOException,
                                               UnavailableException,
                                               java.util.concurrent.TimeoutException,
                                               InvalidRequestException

Performs the actual reading of a row out of the StorageService, fetching a specific set of column names from a given column family.

Throws:

java.io.IOException

UnavailableException

java.util.concurrent.TimeoutException

InvalidRequestException

getRangeSlice

public static java.util.List<Row> getRangeSlice(RangeSliceCommand command,
                                                ConsistencyLevel consistency_level)
                                         throws java.io.IOException,
                                                UnavailableException,
                                                java.util.concurrent.TimeoutException

Throws:

java.io.IOException

UnavailableException

java.util.concurrent.TimeoutException

describeSchemaVersions

public static java.util.Map<java.lang.String,java.util.List<java.lang.String>> describeSchemaVersions()

initiate a request/response session with each live node to check whether or not everybody is using the same migration id. This is useful for determining if a schema change has propagated through the cluster. Disagreement is assumed if any node fails to respond.

getReadOperations

public long getReadOperations()

Specified by:

getReadOperations in interface StorageProxyMBean

getTotalReadLatencyMicros

public long getTotalReadLatencyMicros()

Specified by:

getTotalReadLatencyMicros in interface StorageProxyMBean

getRecentReadLatencyMicros

public double getRecentReadLatencyMicros()

Specified by:

getRecentReadLatencyMicros in interface StorageProxyMBean

getRangeOperations

public long getRangeOperations()

Specified by:

getRangeOperations in interface StorageProxyMBean

getTotalRangeLatencyMicros

public long getTotalRangeLatencyMicros()

Specified by:

getTotalRangeLatencyMicros in interface StorageProxyMBean

getRecentRangeLatencyMicros

public double getRecentRangeLatencyMicros()

Specified by:

getRecentRangeLatencyMicros in interface StorageProxyMBean

getWriteOperations

public long getWriteOperations()

Specified by:

getWriteOperations in interface StorageProxyMBean

getTotalWriteLatencyMicros

public long getTotalWriteLatencyMicros()

Specified by:

getTotalWriteLatencyMicros in interface StorageProxyMBean

getRecentWriteLatencyMicros

public double getRecentWriteLatencyMicros()

Specified by:

getRecentWriteLatencyMicros in interface StorageProxyMBean

scan

public static java.util.List<Row> scan(java.lang.String keyspace,
                                       java.lang.String column_family,
                                       IndexClause index_clause,
                                       SlicePredicate column_predicate,
                                       ConsistencyLevel consistency_level)
                                throws java.io.IOException,
                                       java.util.concurrent.TimeoutException,
                                       UnavailableException

Throws:

java.io.IOException

java.util.concurrent.TimeoutException

UnavailableException

getHintedHandoffEnabled

public boolean getHintedHandoffEnabled()

Specified by:

getHintedHandoffEnabled in interface StorageProxyMBean

setHintedHandoffEnabled

public void setHintedHandoffEnabled(boolean b)

Specified by:

setHintedHandoffEnabled in interface StorageProxyMBean

isHintedHandoffEnabled

public static boolean isHintedHandoffEnabled()

truncateBlocking

public static void truncateBlocking(java.lang.String keyspace,
                                    java.lang.String cfname)
                             throws UnavailableException,
                                    java.util.concurrent.TimeoutException,
                                    java.io.IOException

Performs the truncate operatoin, which effectively deletes all data from the column family cfname

Parameters:

keyspace -

cfname -

Throws:

UnavailableException - If some of the hosts in the ring are down.

java.util.concurrent.TimeoutException

java.io.IOException