abbccdda commented on a change in pull request #9332:
URL: https://github.com/apache/kafka/pull/9332#discussion_r494062676
##########
File path: raft/src/test/java/org/apache/kafka/raft/MockLogTest.java
##########
@@ -370,6 +365,23 @@ public void testReadOutOfRangeOffset() {
Isolation.UNCOMMITTED));
}
+ @Test
+ public void testMonotonicEpochStartOffset() {
+ appendBatch(5, 1);
+ assertEquals(5L, log.endOffset().offset);
+
+ log.initializeLeaderEpoch(2);
+ assertEquals(Optional.of(new OffsetAndEpoch(5L, 1)),
log.endOffsetForEpoch(1));
+ assertEquals(Optional.of(new OffsetAndEpoch(5L, 2)),
log.endOffsetForEpoch(2));
+
+ // Initialize a new epoch at the same end offset. The epoch cache
ensures
+ // that the start offset of each retained epoch increases
monotonically.
Review comment:
I thought this is a test for end offset?
##########
File path: raft/src/test/java/org/apache/kafka/raft/RaftEventSimulationTest.java
##########
@@ -712,11 +712,6 @@ void initializeElection(ElectionState election) {
nodes.values().forEach(state -> {
state.store.writeElectionState(election);
- if (election.hasLeader()) {
Review comment:
So the reason that this is safe is because we no longer try assigning
offset other than the end offset?
##########
File path: raft/src/test/java/org/apache/kafka/raft/MockLog.java
##########
@@ -310,10 +310,10 @@ public LogFetchInfo read(long startOffset, Isolation
isolation) {
}
@Override
- public void assignEpochStartOffset(int epoch, long startOffset) {
- if (startOffset != endOffset().offset)
- throw new IllegalArgumentException(
- "Can only assign epoch for the end offset " +
endOffset().offset + ", but get offset " + startOffset);
+ public void initializeLeaderEpoch(int epoch) {
+ long startOffset = endOffset().offset;
+ epochStartOffsets.removeIf(epochStartOffset ->
Review comment:
So the idea is to wipe out the older epoch (as epoch - 1)'s end offset,
and the search for (epoch - 1) would give (epoch - 2) end offset? In the case
where we put leader change message in mock log, this should never happen right?
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