Class DurabilityException
- All Implemented Interfaces:
Serializable
,oracle.kv.impl.util.FastExternalizable
Durability.ReplicaAckPolicy
was not
available.
The likelihood of this exception being thrown depends on the number of
nodes per replication group, the rate of node failures and how quickly a
failed node is restored to operation, and the specified
ReplicaAckPolicy
. The ReplicaAckPolicy
for the default durability
policy (specified by KVStoreConfig.getDurability()
) is Durability.ReplicaAckPolicy.SIMPLE_MAJORITY
. With SIMPLE_MAJORITY
,
this exception is thrown only when the majority of nodes in a replication
group are unavailable, and in a well-maintained KVStore system with at least
three nodes per replication group this exception should rarely be
thrown.
If the client overrides the default and specifies Durability.ReplicaAckPolicy.ALL
, then this exception will be thrown when
any node in a replication group is unavailable; in other words, it is much
more likely to be thrown. If the client specifies Durability.ReplicaAckPolicy.NONE
, then this exception will never be
thrown.
When this exception is thrown the KVStore service will perform administrative notifications so that actions can be taken to correct the problem. Depending on the nature of the application, the client may wish to
- retry the write operation immediately,
- fall back to a read-only mode and resume write operations at a later time, or
- give up and report an error at a higher level.
- See Also:
-
Method Summary
Modifier and TypeMethodDescriptionReturns the set of Replicas that were available at the time of the operation.Returns the Replica ack policy that was in effect for the operation.boolean
Return whether it known that the operation that produced this exception did not have side effects.int
Returns the number of nodes that were required to be active in order to satisfy the Replica ack policy associated with the operation.Methods inherited from class oracle.kv.FaultException
getFaultClassName, getRemoteStackTrace, toString, wasLoggedRemotely
Methods inherited from class java.lang.Throwable
addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface oracle.kv.impl.util.FastExternalizable
deserializedForm
-
Method Details
-
getCommitPolicy
Returns the Replica ack policy that was in effect for the operation. -
getRequiredNodeCount
public int getRequiredNodeCount()Returns the number of nodes that were required to be active in order to satisfy the Replica ack policy associated with the operation. -
getAvailableReplicas
Returns the set of Replicas that were available at the time of the operation. -
getNoSideEffects
public boolean getNoSideEffects()Return whether it known that the operation that produced this exception did not have side effects. Applications that receive an exception of this class when performing a modify operation and find that this method returns true can safely assume that none of the changes requested by the operation have been performed. If the return value is false, then the operation may or may not have had side effects.- Returns:
- true if it known that the operation that produced this exception did not have side effects, otherwise false.
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