Class DurabilityException
- java.lang.Object
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- java.lang.Throwable
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- java.lang.Exception
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- java.lang.RuntimeException
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- oracle.kv.FastExternalizableException
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- oracle.kv.FaultException
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- oracle.kv.DurabilityException
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- All Implemented Interfaces:
Serializable
,oracle.kv.impl.util.FastExternalizable
public class DurabilityException extends FaultException
Thrown when write operations cannot be initiated because a quorum of Replicas as determined by theDurability.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
. TheReplicaAckPolicy
for the default durability policy (specified byKVStoreConfig.getDurability()
) isDurability.ReplicaAckPolicy.SIMPLE_MAJORITY
. WithSIMPLE_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 specifiesDurability.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:
- Serialized Form
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Field Summary
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Fields inherited from class oracle.kv.FaultException
testNoCurrentInMessage
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Set<String>
getAvailableReplicas()
Returns the set of Replicas that were available at the time of the operation.Durability.ReplicaAckPolicy
getCommitPolicy()
Returns the Replica ack policy that was in effect for the operation.boolean
getNoSideEffects()
Return whether it known that the operation that produced this exception did not have side effects.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.-
Methods inherited from class oracle.kv.FaultException
getFaultClassName, getRemoteStackTrace, getResourceId, setResourceId, toString, wasLoggedRemotely
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Methods inherited from class java.lang.Throwable
addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace
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Method Detail
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getCommitPolicy
public Durability.ReplicaAckPolicy getCommitPolicy()
Returns the Replica ack policy that was in effect for the operation.
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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.
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getAvailableReplicas
public Set<String> getAvailableReplicas()
Returns the set of Replicas that were available at the time of the operation.
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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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