com.datastax.driver.core.exceptions

Class UnavailableException

java.lang.Object

java.lang.Throwable

java.lang.Exception

java.lang.RuntimeException

com.datastax.driver.core.exceptions.DriverException

com.datastax.driver.core.exceptions.QueryExecutionException

com.datastax.driver.core.exceptions.UnavailableException

All Implemented Interfaces:

CoordinatorException, Serializable

public class UnavailableException
extends QueryExecutionException
implements CoordinatorException

Exception thrown when the coordinator knows there is not enough replicas alive to perform a query with the requested consistency level.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
UnavailableException(ConsistencyLevel consistency, int required, int alive) This constructor should only be used internally by the driver when decoding error responses.
UnavailableException(InetSocketAddress address, ConsistencyLevel consistency, int required, int alive)

Method Summary

Modifier and Type	Method and Description
UnavailableException	copy() Copy the exception.
UnavailableException	copy(InetSocketAddress address) Create a copy of this exception with a nicer stack trace, and including the coordinator address that caused this exception to be raised.
InetSocketAddress	getAddress() The full address of the coordinator host that was contacted.
int	getAliveReplicas() The number of replicas that were known to be alive by the Cassandra coordinator node when it tried to execute the operation.
ConsistencyLevel	getConsistencyLevel() The consistency level of the operation triggering this unavailable exception.
InetAddress	getHost() The coordinator host that was contacted.
int	getRequiredReplicas() The number of replica acknowledgements/responses required to perform the operation (with its required consistency level).

Methods inherited from class java.lang.Throwable

addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

UnavailableException

public UnavailableException(ConsistencyLevel consistency,
                            int required,
                            int alive)

This constructor should only be used internally by the driver when decoding error responses.

UnavailableException

public UnavailableException(InetSocketAddress address,
                            ConsistencyLevel consistency,
                            int required,
                            int alive)

Method Detail

getConsistencyLevel

public ConsistencyLevel getConsistencyLevel()

The consistency level of the operation triggering this unavailable exception.

Returns:

the consistency level of the operation triggering this unavailable exception.

getRequiredReplicas

public int getRequiredReplicas()

The number of replica acknowledgements/responses required to perform the operation (with its required consistency level).

Returns:

the number of replica acknowledgements/responses required to perform the operation.

getAliveReplicas

public int getAliveReplicas()

The number of replicas that were known to be alive by the Cassandra coordinator node when it tried to execute the operation.

Returns:

The number of replicas that were known to be alive by the Cassandra coordinator node when it tried to execute the operation.

getHost

public InetAddress getHost()

The coordinator host that was contacted.

This is a shortcut for getAddress().getAddress().

Specified by:

getHost in interface CoordinatorException

Returns:

The coordinator host that was contacted; may be null if the coordinator is not known.

getAddress

public InetSocketAddress getAddress()

The full address of the coordinator host that was contacted.

Specified by:

getAddress in interface CoordinatorException

Returns:

the full address of the coordinator host that was contacted; may be null if the coordinator is not known.

copy

public UnavailableException copy()

Description copied from class: DriverException

Copy the exception.

This returns a new exception, equivalent to the original one, except that because a new object is created in the current thread, the top-most element in the stacktrace of the exception will refer to the current thread (this is mainly intended for internal use by the driver). The cause of the copied exception will be the original exception.

Overrides:

copy in class DriverException

Returns:

a copy/clone of this exception.

copy

public UnavailableException copy(InetSocketAddress address)

Create a copy of this exception with a nicer stack trace, and including the coordinator address that caused this exception to be raised.

This method is mainly intended for internal use by the driver and exists mainly because:

1. the original exception was decoded from a response frame and at that time, the coordinator address was not available; and
2. the newly-created exception will refer to the current thread in its stack trace, which generally yields a more user-friendly stack trace that the original one.

Parameters:

address - The full address of the host that caused this exception to be thrown.

Returns:

a copy/clone of this exception, but with the given host address instead of the original one.