adoroszlai commented on code in PR #4599:
URL: https://github.com/apache/ozone/pull/4599#discussion_r1172940793
##########
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/container/replication/RatisUnderReplicationHandler.java:
##########
@@ -217,7 +217,15 @@ private List<DatanodeDetails> getSources(
}
})
.filter(r -> !pendingDeletion.contains(r.getDatanodeDetails()))
- .sorted((r1, r2) -> r2.getSequenceId().compareTo(r1.getSequenceId()))
+ .collect(Collectors.toList());
+
+ // We should replicate only the max available sequence ID, as replicas with
+ // earlier sequence IDs may be stale copies.
+ long maxSequenceId = availableSources.stream()
+ .map(ContainerReplica::getSequenceId).max(Long::compareTo).orElse(0L);
Review Comment:
`Long getSequenceId()` may return `null`, so for safety we may add a filter
in the stream collecting `availableSources` above.
```
.filter(r -> r.getSequenceId() != null)
```
Not strictly necessary, as I'm not sure all other code handles `null`
gracefully.
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