HDFS-16813. Remove parameter validation logic such as dfs.namenode.decommission.blocks.per.interval in DatanodeAdminManager#activate (#5063)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminDefaultMonitor.java

@@ -114,6 +114,15 @@ protected void processConf() {
       numBlocksPerCheck =
           DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_DEFAULT;
     }
+
+    final String deprecatedKey = "dfs.namenode.decommission.nodes.per.interval";
+    final String strNodes = conf.get(deprecatedKey);
+    if (strNodes != null) {
+      LOG.warn("Deprecated configuration key {} will be ignored.", deprecatedKey);
+      LOG.warn("Please update your configuration to use {} instead.",
+          DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_KEY);
+    }
+
     LOG.info("Initialized the Default Decommission and Maintenance monitor");
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminManager.java

@@ -108,32 +108,6 @@ void activate(Configuration conf) {
     Preconditions.checkArgument(intervalSecs >= 0, "Cannot set a negative " +
         "value for " + DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_INTERVAL_KEY);
 
-    int blocksPerInterval = conf.getInt(
-        DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_KEY,
-        DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_DEFAULT);
-
-    final String deprecatedKey =
-        "dfs.namenode.decommission.nodes.per.interval";
-    final String strNodes = conf.get(deprecatedKey);
-    if (strNodes != null) {
-      LOG.warn("Deprecated configuration key {} will be ignored.",
-          deprecatedKey);
-      LOG.warn("Please update your configuration to use {} instead.",
-          DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_KEY);
-    }
-
-    Preconditions.checkArgument(blocksPerInterval > 0,
-        "Must set a positive value for "
-        + DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_BLOCKS_PER_INTERVAL_KEY);
-
-    final int maxConcurrentTrackedNodes = conf.getInt(
-        DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES,
-        DFSConfigKeys
-            .DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES_DEFAULT);
-    Preconditions.checkArgument(maxConcurrentTrackedNodes >= 0,
-        "Cannot set a negative value for "
-        + DFSConfigKeys.DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES);
-
     Class cls = null;
     try {
       cls = conf.getClass(
@@ -152,12 +126,7 @@ void activate(Configuration conf) {
     executor.scheduleWithFixedDelay(monitor, intervalSecs, intervalSecs,
         TimeUnit.SECONDS);
 
-    if (LOG.isDebugEnabled()) {
+    LOG.debug("Activating DatanodeAdminManager with interval {} seconds.", intervalSecs);
-      LOG.debug("Activating DatanodeAdminManager with interval {} seconds, " +
-              "{} max blocks per interval, " +
-              "{} max concurrently tracked nodes.", intervalSecs,
-          blocksPerInterval, maxConcurrentTrackedNodes);
-    }
   }
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminMonitorBase.java

@@ -123,6 +123,10 @@ public void setConf(Configuration conf) {
           DFSConfigKeys
               .DFS_NAMENODE_DECOMMISSION_MAX_CONCURRENT_TRACKED_NODES_DEFAULT;
     }
+
+    LOG.debug("Activating DatanodeAdminMonitor with {} max concurrently tracked nodes.",
+        maxConcurrentTrackedNodes);
+
     processConf();
   }