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Kip101.tla
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Kip101.tla
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(*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*)
------------------------------- MODULE Kip101 -------------------------------
(**
* With KIP-101, we used leader epoch information in the records to find a
* more accurate offset for truncation.
*)
EXTENDS KafkaReplication
OffsetsWithLargerEpochs(replica, epoch) ==
{entry.offset : entry \in
{entry \in ReplicaLog!GetAllEntries(replica) : entry.record.epoch > epoch}}
LookupOffsetForEpoch(leader, follower, epoch) ==
IF ReplicaLog!IsEmpty(leader)
THEN replicaState[follower].hw
ELSE IF ReplicaLog!GetLatestRecord(leader).epoch = epoch
THEN ReplicaLog!GetEndOffset(leader)
ELSE LET offsetWithLargerEpochs == OffsetsWithLargerEpochs(leader, epoch)
IN IF offsetWithLargerEpochs = {}
THEN replicaState[follower].hw
ELSE Min(offsetWithLargerEpochs)
BecomeFollowerTruncateKip101 == \E leader, replica \in Replicas :
\/ /\ ReplicaLog!IsEmpty(replica)
/\ BecomeFollowerAndTruncateTo(leader, replica, 0)
\/ \E record \in LogRecords :
/\ ReplicaLog!IsLatestRecord(replica, record)
/\ LET offset == LookupOffsetForEpoch(leader, replica, record.epoch)
IN BecomeFollowerAndTruncateTo(leader, replica, offset)
LOCAL Next ==
\/ ControllerElectLeader
\/ ControllerShrinkIsr
\/ BecomeLeader
\/ LeaderExpandIsr
\/ LeaderShrinkIsr
\/ LeaderWrite
\/ LeaderIncHighWatermark
\/ BecomeFollowerTruncateKip101
\/ FollowerReplicate
LOCAL Spec == Init /\ [][Next]_vars
/\ SF_vars(LeaderIncHighWatermark)
/\ SF_vars(LeaderExpandIsr)
/\ SF_vars(LeaderWrite)
/\ WF_vars(BecomeFollowerTruncateKip101)
/\ WF_vars(BecomeLeader)
=============================================================================
\* Modification History
\* Last modified Mon Jul 09 00:16:30 PDT 2018 by jason
\* Created Thu Jul 05 23:39:35 PDT 2018 by jason