belliottsmith commented on code in PR #4668:
URL: https://github.com/apache/cassandra/pull/4668#discussion_r2987845843
##########
src/java/org/apache/cassandra/tcm/sequences/Move.java:
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@@ -203,6 +214,49 @@ public SequenceState executeNext()
try
{
ClusterMetadata metadata = ClusterMetadata.current();
+ TopologyManager.RegainingEpochRange regainingEpochRange =
AccordService.instance().topology().epochAndRangeToBeRetired(AccordService.instance().topology().current(),
AccordTopology.createAccordTopology(applyTo(metadata).success().metadata));
+ if (regainingEpochRange != null)
+ {
+ Condition condition = newOneTimeCondition();
+
+ class waitForEpochAndRangeRetirement implements
TopologyListener
+ {
+ final Condition condition;
+ final long waitingForEpoch;
+ final Ranges waitingForRange;
+
+ public waitForEpochAndRangeRetirement(Condition
condition, long waitingForEpoch, Ranges waitingForRange)
+ {
+ this.condition = condition;
+ this.waitingForEpoch = waitingForEpoch;
+ this.waitingForRange = waitingForRange;
+ }
+
+ @Override
+ public void onEpochRetired(Ranges ranges, long
epoch, @Nullable Topology topology)
+ {
+ try
+ {
+ if (epoch >= waitingForEpoch &&
AccordService.instance().topology().active().get(waitingForEpoch).retired().containsAll(waitingForRange))
+ condition.signal();
+ }
+ catch (TopologyRetiredException e)
+ {
+ condition.signal();
+ }
+ catch (TopologyException e)
+ {
+ logger.info("Topology exception: ", e);
+ }
+ }
+ }
+
+ waitForEpochAndRangeRetirement wait = new
waitForEpochAndRangeRetirement(condition, regainingEpochRange.epoch(),
regainingEpochRange.range());
+ AccordService.instance().topology().addListener(wait);
+ condition.awaitThrowUncheckedOnInterrupt();
+
AccordService.instance().topology().removeListener(wait);
Review Comment:
this should happen in a finally block
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