szetszwo commented on a change in pull request #2175:
URL: https://github.com/apache/hadoop/pull/2175#discussion_r464571396



##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/SnapshotManager.java
##########
@@ -99,13 +99,15 @@
 
   private boolean allowNestedSnapshots = false;
   private int snapshotCounter = 0;
+  private final int maxSnapshotLimitPerDirectory;

Review comment:
       Let's keep using maxSnapshotLimit for per directory limit and add a new 
variable for the new filesystem limit so that it is consistent with the conf.

##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
##########
@@ -498,9 +498,14 @@
   public static final int
       DFS_NAMENODE_SNAPSHOT_DIFF_LISTING_LIMIT_DEFAULT = 1000;
 
-  public static final String DFS_NAMENODE_SNAPSHOT_MAX_LIMIT =
-      "dfs.namenode.snapshot.max.limit";
+  public static final String
+      DFS_NAMENODE_SNAPSHOT_MAX_LIMIT = "dfs.namenode.snapshot.max.limit";

Review comment:
       Yes, we cannot change config names.
   
   BTW, please revert the white space change so that it will be easier to back 
port.

##########
File path: 
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
##########
@@ -498,9 +498,14 @@
   public static final int
       DFS_NAMENODE_SNAPSHOT_DIFF_LISTING_LIMIT_DEFAULT = 1000;
 
-  public static final String DFS_NAMENODE_SNAPSHOT_MAX_LIMIT =
-      "dfs.namenode.snapshot.max.limit";
+  public static final String
+      DFS_NAMENODE_SNAPSHOT_MAX_LIMIT = "dfs.namenode.snapshot.max.limit";
   public static final int DFS_NAMENODE_SNAPSHOT_MAX_LIMIT_DEFAULT = 65536;
+  public static final String
+      DFS_NAMENODE_SNAPSHOT_GLOBAL_LIMIT = 
"dfs.namenode.snapshot.global.limit";

Review comment:
       Let's call this filesystem.limit?  Since there are multiple datacenter 
settings, "global" may be confusing. 




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