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From GitBox <...@apache.org>
Subject [GitHub] [hadoop] fengnanli commented on a change in pull request #2266: [RBF] HDFS-15554 Force router check file existence in destinations before adding/updating mount points
Date Wed, 02 Sep 2020 04:56:24 GMT

fengnanli commented on a change in pull request #2266:
URL: https://github.com/apache/hadoop/pull/2266#discussion_r481691251

File path: hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterAdminServer.java
@@ -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:
       Yeah, I can add that.
   This logic change will break a lot of current tests listed by yetus above. What is a good
practice here? I have two ideas in mind:
   1) make the logic based on a command option when adding/updating mount tables.
   2) add mock (if possible) like what I did for TestRouterAdmin.java to fake out the dirs
in namenodes.
   I like 2 since I think this should be the default check, what's your opinion?

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