goiri commented on a change in pull request #2266:
URL: https://github.com/apache/hadoop/pull/2266#discussion_r481606808
##########
File path:
hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterAdminServer.java
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@@ -562,11 +595,35 @@ public GetDestinationResponse getDestination(
LOG.error("Cannot get location for {}: {}",
src, ioe.getMessage());
}
- if (nsIds.isEmpty() && !locations.isEmpty()) {
- String nsId = locations.get(0).getNameserviceId();
- nsIds.add(nsId);
+ return nsIds;
+ }
+
+ /**
+ * Verify the file exists in destination nameservices to avoid dangling
+ * mount points.
+ *
+ * @param entry the new mount points added, could be from add or update.
+ * @return destination nameservices where the file doesn't exist.
+ * @throws IOException
+ */
+ private List<String> verifyFileInDestinations(MountTable entry)
Review comment:
I would unit tests just for this function if possible.
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