aweisberg commented on code in PR #4508:
URL: https://github.com/apache/cassandra/pull/4508#discussion_r2628528590
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src/java/org/apache/cassandra/db/AbstractMutationVerbHandler.java:
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@@ -193,6 +196,49 @@ else if
(message.epoch().isBefore(metadata.schema.lastModified()))
return metadata;
}
+ /**
+ * Confirm that the presence/absence of a mutation id matches our
expectations for the given keyspace/table/token. If
+ * it doesn't, then we're not on the same epoch as the coordinator, or
there's a bug.
+ */
+ private ClusterMetadata checkReplicationMigration(ClusterMetadata
metadata, Message<T> message, InetAddressAndPort respondTo)
+ {
+ IMutation mutation = message.payload;
+ MutationRouting expected = mutation.id().isNone() ?
MutationRouting.UNTRACKED : MutationRouting.TRACKED;
+ if (expected == MigrationRouter.getMutationRouting(metadata, mutation))
+ return metadata;
+
+ if (message.epoch().isAfter(metadata.epoch))
+ {
+ // coordinator is ahead, fetch log and recheck
+ metadata =
ClusterMetadataService.instance().fetchLogFromPeerOrCMS(metadata, respondTo,
message.epoch());
+ if (expected != MigrationRouter.getMutationRouting(metadata,
mutation))
+ throw new IllegalStateException(String.format("Inconsistent
mutation routing after fetching log for epoch = %s. Keyspace: %s key: %s ",
Review Comment:
This isn't an illegal state it could still be the coordinator is behind
because fetchLogFromPeerOrCMS returns a metadata with a later epoch
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