com.bigdata.ha.msg

Interface IHANotifyReleaseTimeRequest

All Superinterfaces:

IHAMessage, Serializable

All Known Implementing Classes:

HANotifyReleaseTimeRequest

public interface IHANotifyReleaseTimeRequest
extends IHAMessage

Message from a follower to the leader in which the follower specifies the earliest commit point that is pinned on the follower by an active transaction or the minReleaseAge associated with its local ITransactionService.

Author:

Bryan Thompson

Method Summary

Methods

Modifier and Type	Method and Description
long	getNewCommitCounter() The commit counter that will be assigned to the new commit point (as specified by the leader).
long	getNewCommitTime() The commit time that will be assigned to the new commit point (as specified by the leader).
long	getPinnedCommitCounter() The earliest pinned commit counter on the follower.
long	getPinnedCommitTime() The earliest pinned commit time on the follower.
UUID	getServiceUUID() The service that provided this information.
long	getTimestamp() A timestamp taken during the protocol used to agree on the new release time.
boolean	isMock() Mock responses are used when a follow is unable to provide a correct response (typically because the follower is not yet HAReady and hence is not able to participate in the gather).

Method Detail

getServiceUUID

UUID getServiceUUID()

The service that provided this information.

getPinnedCommitTime

long getPinnedCommitTime()

The earliest pinned commit time on the follower.

getPinnedCommitCounter

long getPinnedCommitCounter()

The earliest pinned commit counter on the follower.

getTimestamp

long getTimestamp()

A timestamp taken during the protocol used to agree on the new release time. This is used to detect problems where the clocks are not synchronized on the services.

isMock

boolean isMock()

Mock responses are used when a follow is unable to provide a correct response (typically because the follower is not yet HAReady and hence is not able to participate in the gather). The mock responses preserves liveness since the GATHER protocol will terminate quickly. By marking the response as a mock object, the leader can differentiate mock responses from valid responses and discard the mock responeses. If the GATHER task on the follower sends a mock response to the leader, then it will also have thrown an exception out of its GatherTask which will prevent the follower from voting YES on the PREPARE message for that 2-phase commit.

See Also:

HA3 simultaneous service start failure

getNewCommitCounter

long getNewCommitCounter()

The commit counter that will be assigned to the new commit point (as specified by the leader).

getNewCommitTime

long getNewCommitTime()

The commit time that will be assigned to the new commit point (as specified by the leader).