oracle.kv
Class ConsistencyException

java.lang.Object
  java.lang.Throwable
      java.lang.Exception
          java.lang.RuntimeException
              oracle.kv.FaultException
                  oracle.kv.ConsistencyException

All Implemented Interfaces:

Serializable

public class ConsistencyException
extends FaultException

Thrown when a single or multiple-operation transaction fails because the specified Consistency could not be met, within the allowed timeout period.

The likelihood of this exception being thrown depends on the specified Consistency and the general health of the KVStore system. The default consistency policy (specified by KVStoreConfig.getConsistency()) is Consistency.NONE_REQUIRED. With either Consistency.NONE_REQUIRED (the default) or Consistency.ABSOLUTE, this exception will never be thrown.

If the client overrides the default and specifies a Consistency.Time or Consistency.Version setting, then this exception will be thrown when the specified consistency requirement cannot be satisfied within the timeout period associated with the consistency setting. If this exception is encountered frequently, it indicates that the consistency policy requirements are too strict and cannot be met routinely given the load being placed on the system and the hardware resources that are available to service the load.

Depending on the nature of the application, when this exception is thrown the client may wish to

• retry the read operation,
• fall back to using a larger timeout or a less restrictive consistency setting (for example, Consistency.NONE_REQUIRED), and resume using the original consistency setting at a later time, or
• give up and report an error at a higher level.

See Also:

Serialized Form

Method Summary

Consistency

getConsistency() Returns the consistency policy that could not be satisfied.

Methods inherited from class oracle.kv.FaultException

getFaultClassName, getRemoteStackTrace, toString, wasLoggedRemotely

Methods inherited from class java.lang.Throwable

fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace

Methods inherited from class java.lang.Object

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

Method Detail

getConsistency

public Consistency getConsistency()

Returns the consistency policy that could not be satisfied.