Patroni

Lock

LockRequest

LockResponse

Lock acquires a distributed shared lock on a given named lock. On success, it will return a unique key that exists so long as the lock is held by the caller. This key can be used in conjunction with transactions to safely ensure updates to etcd only occur while holding lock ownership. The lock is held until Unlock is called on the key or the lease associate with the owner expires.

Unlock

UnlockRequest

UnlockResponse

Unlock takes a key returned by Lock and releases the hold on lock. The next Lock caller waiting for the lock will then be woken up and given ownership of the lock.

name

name is the identifier for the distributed shared lock to be acquired.

bytes

lease

lease is the ID of the lease that will be attached to ownership of the lock. If the lease expires or is revoked and currently holds the lock, the lock is automatically released. Calls to Lock with the same lease will be treated as a single acquisition; locking twice with the same lease is a no-op.

int64

header

etcdserverpb.ResponseHeader

key

key is a key that will exist on etcd for the duration that the Lock caller owns the lock. Users should not modify this key or the lock may exhibit undefined behavior.

bytes

key

key is the lock ownership key granted by Lock.

bytes

header

etcdserverpb.ResponseHeader

Campaign

CampaignRequest

CampaignResponse

Campaign waits to acquire leadership in an election, returning a LeaderKey representing the leadership if successful. The LeaderKey can then be used to issue new values on the election, transactionally guard API requests on leadership still being held, and resign from the election.

Proclaim

ProclaimRequest

ProclaimResponse

Proclaim updates the leader’s posted value with a new value.

Leader

LeaderRequest

LeaderResponse

Leader returns the current election proclamation, if any.

Observe

LeaderRequest

LeaderResponse

Observe streams election proclamations in-order as made by the election’s elected leaders.

Resign

ResignRequest

ResignResponse

Resign releases election leadership so other campaigners may acquire leadership on the election.

name

name is the election’s identifier for the campaign.

bytes

lease

lease is the ID of the lease attached to leadership of the election. If the lease expires or is revoked before resigning leadership, then the leadership is transferred to the next campaigner, if any.

int64

value

value is the initial proclaimed value set when the campaigner wins the election.

bytes

header

etcdserverpb.ResponseHeader

leader

leader describes the resources used for holding leadereship of the election.

LeaderKey

name

name is the election identifier that corresponds to the leadership key.

bytes

key

key is an opaque key representing the ownership of the election. If the key is deleted, then leadership is lost.

bytes

rev

rev is the creation revision of the key. It can be used to test for ownership of an election during transactions by testing the key’s creation revision matches rev.

int64

lease

lease is the lease ID of the election leader.

int64

name

name is the election identifier for the leadership information.

bytes

header

etcdserverpb.ResponseHeader

kv

kv is the key-value pair representing the latest leader update.

mvccpb.KeyValue

leader

leader is the leadership hold on the election.

LeaderKey

value

value is an update meant to overwrite the leader’s current value.

bytes

header

etcdserverpb.ResponseHeader

leader

leader is the leadership to relinquish by resignation.

LeaderKey

header

etcdserverpb.ResponseHeader

type

type is the kind of event. If type is a PUT, it indicates new data has been stored to the key. If type is a DELETE, it indicates the key was deleted.

EventType

kv

kv holds the KeyValue for the event. A PUT event contains current kv pair. A PUT event with kv.Version=1 indicates the creation of a key. A DELETE/EXPIRE event contains the deleted key with its modification revision set to the revision of deletion.

KeyValue

prev_kv

prev_kv holds the key-value pair before the event happens.

KeyValue

key

key is the key in bytes. An empty key is not allowed.

bytes

create_revision

create_revision is the revision of last creation on this key.

int64

mod_revision

mod_revision is the revision of last modification on this key.

int64

version

version is the version of the key. A deletion resets the version to zero and any modification of the key increases its version.

int64

value

value is the value held by the key, in bytes.

bytes

lease

lease is the ID of the lease that attached to key. When the attached lease expires, the key will be deleted. If lease is 0, then no lease is attached to the key.

int64