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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 Fri, 04 Sep 2020 05:44:21 GMT

fengnanli commented on a change in pull request #2266:
URL: https://github.com/apache/hadoop/pull/2266#discussion_r483399376

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:
       @goiri Uploaded an early version of trying to fix all tests. This is pretty tedious
work so before I spend more time on this, let me know your thoughts.
   There are mainly two types of tests when dealing with mount table:
   1. Use mock RouterRpcServer and so on, this way no downstream namenode calls are made.
I put the mock as well, see the change for TestRouterAdmin.java
   2. Use real downstream namenode interaction, see TestRouterMountTable.java. I created the
paths before calling mount points change.
   I kept thinking a much easier way is to add a Router server side config to turn this on
and the default is on. In the tests I can just turn the config off explicitly and this way
I don't need to deal with individual tests.

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